1
|
Jiang H, Cui H, Chen M, Li F, Shen X, Guo CJ, Hoekel GE, Zhu Y, Han L, Wu K, Holtzman MJ, Liu Q. Divergent sensory pathways of sneezing and coughing. Cell 2024:S0092-8674(24)00900-0. [PMID: 39243765 DOI: 10.1016/j.cell.2024.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 06/25/2024] [Accepted: 08/07/2024] [Indexed: 09/09/2024]
Abstract
Sneezing and coughing are primary symptoms of many respiratory viral infections and allergies. It is generally assumed that sneezing and coughing involve common sensory receptors and molecular neurotransmission mechanisms. Here, we show that the nasal mucosa is innervated by several discrete populations of sensory neurons, but only one population (MrgprC11+MrgprA3-) mediates sneezing responses to a multitude of nasal irritants, allergens, and viruses. Although this population also innervates the trachea, it does not mediate coughing, as revealed by our newly established cough model. Instead, a distinct sensory population (somatostatin [SST+]) mediates coughing but not sneezing, unraveling an unforeseen sensory difference between sneezing and coughing. At the circuit level, sneeze and cough signals are transmitted and modulated by divergent neuropathways. Together, our study reveals the difference in sensory receptors and neurotransmission/modulation mechanisms between sneezing and coughing, offering neuronal drug targets for symptom management in respiratory viral infections and allergies.
Collapse
Affiliation(s)
- Haowu Jiang
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Huan Cui
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Mengyu Chen
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Fengxian Li
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Xiaolei Shen
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Changxiong J Guo
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - George E Hoekel
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Yuyan Zhu
- The School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Liang Han
- The School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Kangyun Wu
- Pulmonary and Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Michael J Holtzman
- Pulmonary and Critical Care Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA
| | - Qin Liu
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine in St. Louis, St. Louis, MO 63110, USA.
| |
Collapse
|
2
|
Davey SL, Lee BJ, Robbins T, Thake CD. Prevalence of occupational heat stress across the seasons and its management amongst healthcare professionals in the UK. APPLIED ERGONOMICS 2024; 118:104281. [PMID: 38581844 DOI: 10.1016/j.apergo.2024.104281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/20/2024] [Accepted: 03/29/2024] [Indexed: 04/08/2024]
Abstract
Occupational heat stress (OHS) is an issue in healthcare facilities (HCFs) in the United Kingdom (UK). The aims of this study were to evaluate perceived levels of OHS during two seasons and its perceived consequences on healthcare professionals (HCPs) and to assess the efficacy of heat stress management (HSM) policies. An anonymous online survey was distributed to HCPs working in HCFs in the UK. The survey returned 1014 responses (87% women). Descriptive statistics and content analysis of survey data identified that OHS in HCFs is frequently experienced throughout the year and concerned most HCPs. Over 90% perceived OHS impairs their performance and 20% reported heat-related absenteeism. Awareness of HSM policies was poor and 73% deemed them not adequate. To help reduce the financial loss and impact on staff performance, health and well-being and patient safety, it is recommended that revisions and widespread dissemination of HSM policies are made.
Collapse
Affiliation(s)
- S L Davey
- Occupational and Environmental Physiology Group, Centre for Physical Activity, Sport & Exercise Sciences, Research Institute for Health and Wellbeing, Coventry University, Coventry, UK.
| | - B J Lee
- Occupational and Environmental Physiology Group, Centre for Physical Activity, Sport & Exercise Sciences, Research Institute for Health and Wellbeing, Coventry University, Coventry, UK
| | - Timothy Robbins
- University Hospitals Coventry & Warwickshire NHS Trust, Coventry, UK; Institute of Digital Healthcare, WMG, University of Warwick, Coventry, UK
| | - C D Thake
- Occupational and Environmental Physiology Group, Centre for Physical Activity, Sport & Exercise Sciences, Research Institute for Health and Wellbeing, Coventry University, Coventry, UK
| |
Collapse
|
3
|
Alvarez-Herrera C, Murillo-Ramirez JG. Airflow detailed analysis through a face mask using the schlieren technique. Heliyon 2024; 10:e33384. [PMID: 39027447 PMCID: PMC11254836 DOI: 10.1016/j.heliyon.2024.e33384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 06/20/2024] [Accepted: 06/20/2024] [Indexed: 07/20/2024] Open
Abstract
This work presents an exhaustive visualization of the airflow expulsed by a person while breathing, talking, exhaling, and blowing inside a closed room wearing a disposable face mask like those used in hospitals for patient protection and those who care for them. An optical schlieren experimental arrangement was used to obtain some of the relevant physical characteristics of the airflow, such as its refractive index gradient, the distribution of temperature, and the associated velocity field for all the tests developed. We tested three face masks, one of the surgical types and the others of the N95 series with denominations KN95 and 3MN95 (Aura TC-84A-8590). The results show appreciable differences between the masks evaluated; the surgical mask was the one that allowed the most abrupt output airflow through it in the field of view of the experimental setup. However, were also found some differences in the performance of the KN95 and 3MN95 masks. The KN95 face mask had the best performance since it expulsed to its surroundings the lowest airflow with different physical properties to the input airflow. The results obtained are relevant since it was possible to estimate the expulsed airflow velocity as a function of the distance for every face mask tested, which allows for understanding its filtering capacity by restricting the flow of potential pathogens from the mouth or nose of one person to another. Undoubtedly, the airflow behavior determination around a face mask can help to reduce the risk of spreading infectious airborne particles.
Collapse
Affiliation(s)
- Cornelio Alvarez-Herrera
- Facultad de Ingeniería, Universidad Autónoma de Chihuahua, Nuevo Campus Universitario, Circuito, Universitario S/N, 31125, Chihuahua, Chih., Mexico
| | - Jose G. Murillo-Ramirez
- Facultad de Ingeniería, Universidad Autónoma de Chihuahua, Nuevo Campus Universitario, Circuito, Universitario S/N, 31125, Chihuahua, Chih., Mexico
- Centro de Investigación en Materiales Avanzados S. C., Miguel de Cervantes 120, 31136, Chihuahua, Chih., Mexico
| |
Collapse
|
4
|
Rasheed A, Parmar K, Jain S, Chakravortty D, Basu S. Weather-related changes in the dehydration of respiratory droplets on surfaces bolster bacterial endurance. J Colloid Interface Sci 2024; 674:653-662. [PMID: 38950464 DOI: 10.1016/j.jcis.2024.06.218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 06/23/2024] [Accepted: 06/27/2024] [Indexed: 07/03/2024]
Abstract
HYPOTHESIS The study shows for the first time a fivefold difference in the survivability of the bacterium Pseudomonas Aeruginosa (PA) in a realistic respiratory fluid droplet on fomites undergoing drying at different environmental conditions. For instance, in 2023, the annual average outdoor relative humidity (RH) and temperature in London (UK) is 71 % and 11 °C, whereas in New Delhi (India), it is 45 % and 26 °C, showing that disease spread from fomites could have a demographic dependence. Respiratory fluid droplet ejections containing pathogens on inanimate surfaces are crucial in disease spread, especially in nosocomial settings. However, the interplay between evaporation dynamics, internal fluid flow and precipitation and their collective influence on the distribution and survivability of pathogens at different environmental conditions are less known. EXPERIMENTS Shadowgraphy imaging is employed to study evaporation, and optical microscopy imaging is used for precipitation dynamics. Micro-particle image velocimetry (MicroPIV) measurements reveal the internal flow dynamics. Confocal imaging of fluorescently labelled PA elucidates the bacterial distribution within the deposits. FINDINGS The study finds that the evaporation rate is drastically impeded during drying at elevated solutal concentrations, particularly at high RH and low temperature conditions. MicroPIV shows reduced internal flow under high RH and low temperature (low evaporation rate) conditions. Evaporation rate influences crystal growth, with delayed efflorescence and extending crystallization times. PA forms denser peripheral arrangements under high evaporation rates and shows a fivefold increase in survivability under low evaporation rates. These findings highlight the critical impact of environmental conditions on pathogen persistence and disease spread from inanimate surfaces.
Collapse
Affiliation(s)
- Abdur Rasheed
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore India
| | - Kirti Parmar
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore India
| | - Siddhant Jain
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore India
| | - Dipshikha Chakravortty
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore India; School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala 695551 India.
| | - Saptarshi Basu
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore India.
| |
Collapse
|
5
|
Yang D, Xu J, Wu T, Zhang W, Zhu X, Zhang Z, Zhu B. Colonization of bacterial and viral respiratory pathogens among healthcare workers in China during COVID-19 pandemic. J Oral Microbiol 2024; 16:2365965. [PMID: 38910869 PMCID: PMC11191836 DOI: 10.1080/20002297.2024.2365965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/27/2024] [Indexed: 06/25/2024] Open
Abstract
Background Healthcare settings may amplify transmission of respiratory pathogens, however empirical evidence is lacking. We aimed to describe the spectrum and distribution of respiratory pathogens among healthcare workers in eastern China. Methods Healthcare workers were recruited from October 2020 to November 2021 in Jiangsu province. Participants were interviewed regarding demographic and hospital-based protective measures. Thirty-seven common respiratory pathogens were tested using real-time PCR/RT-PCR (Probe qPCR). The role of demographic and hospital-based protective measures on pathogens colonization using multivariable logistic regression models. Results Among 316 enrolled healthcare workers, a total of 21 pathogens were detected. In total, 212 (67.1%) healthcare workers had at least one respiratory pathogen; 195 (61.7%) and 70 (22.2%) with a bacterial and viral pathogen. The most commonly detected pathogen was streptococcus pneumoniae (47.5%) followed by Haemophilus influenzae (21.2%). One hundred and five (33.2%) healthcare workers with copathogens had at least two respiratory pathogens. Both bacterial and viral colonization were more common in 2020 compared to 2021. A decreased risk of colonization was seen in participants with infection prevention and control training and suitable hand hygiene. Conclusions Colonization of respiratory pathogens in healthcare workers from eastern China was high. Differential risk was impacted only by hospital-based protective measures and not demographic factors.
Collapse
Affiliation(s)
- Dandan Yang
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, School of Public Health, Nanjing Medical University, Nanjing, PR China
- Department of Sexually Transmitted Diseases and AIDS, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, PR China
- Department of Genetic Toxicology, The Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, PR China
| | - Jianan Xu
- Department of Policy Research Office, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, PR China
| | - Tao Wu
- Department of Pathogenic Microbiology, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, PR China
| | - Wei Zhang
- Department of Public Health, Kunshan Hospital of Traditional Chinese Medicine, Suzhou, PR China
| | - Xiaojun Zhu
- Department of Prevention and Health, The Second Affiliated Hospital of Soochow University, Suzhou, PR China
| | - Zhengdong Zhang
- Department of Environmental Genomics, Jiangsu Key Laboratory of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Personalized Medicine, School of Public Health, Nanjing Medical University, Nanjing, PR China
- Department of Genetic Toxicology, The Key Laboratory of Modern Toxicology of Ministry of Education, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, PR China
| | - Baoli Zhu
- Department of Sexually Transmitted Diseases and AIDS, Center for Disease Control and Prevention of Jiangsu Province, Nanjing, PR China
| |
Collapse
|
6
|
Zhu DM, Yan YS, Wang H, Zhong Y, Inam, Gao YH, Li GM, Mu GD, Dong HF, Li Y, Liu DK, Ma HX, Kong LC. Transmission of human-pet antibiotic resistance via aerosols in pet hospitals of Changchun. One Health 2024; 18:100765. [PMID: 38855194 PMCID: PMC11157275 DOI: 10.1016/j.onehlt.2024.100765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 05/24/2024] [Indexed: 06/11/2024] Open
Abstract
In recent years, aerosols have been recognized as a prominent medium for the transmission of antibiotic-resistant bacteria and genes. Among these, particles with a particle size of 2 μm (PM2.5) can directly penetrate the alveoli. However, the presence of antibiotic-resistant genes in aerosols from pet hospitals and the potential risks posed by antibiotic-resistant bacteria in these aerosols to humans and animals need to be investigated. In this study, cefotaxime-resistant bacteria were collected from 5 representative pet hospitals in Changchun using a Six-Stage Andersen Cascade Impactor. The distribution of bacteria in each stage was analyzed, and bacteria from stage 5 and 6 were isolated and identified. Minimal inhibitory concentrations of isolates against 12 antimicrobials were determined using broth microdilution method. Quantitative Polymerase Chain Reaction was employed to detect resistance genes and mobile genetic elements that could facilitate resistance spread. The results indicated that ARBs were enriched in stage 5 (1.1-2.1 μm) and stage 3 (3.3-4.7 μm) of the sampler. A total of 159 isolates were collected from stage 5 and 6. Among these isolates, the genera Enterococcus spp. (51%), Staphylococcus spp. (19%), and Bacillus spp. (14%) were the most prevalent. The isolates exhibited the highest resistance to tetracycline and the lowest resistance to cefquinome. Furthermore, 56 (73%) isolates were multidrug-resistant. Quantitative PCR revealed the expression of 165 genes in these isolates, with mobile genetic elements showing the highest expression levels. In conclusion, PM2.5 from pet hospitals harbor a significant number of antibiotic-resistant bacteria and carry mobile genetic elements, posing a potential risk for alveolar infections and the dissemination of antibiotic resistance genes.
Collapse
Affiliation(s)
- Dao Mi Zhu
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Ya Song Yan
- The Key Laboratory of New Veterinary Drug Research and Development of Jilin Province, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Hao Wang
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Yue Zhong
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Inam
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Yun Hang Gao
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Gong Mei Li
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Guo Dong Mu
- Jilin Provincial Animal Disease Prevention and Control Center, Jilin Animal Husbandry Building, Xi'an Road No. 4510, Changchun, PR China
| | - Hui Feng Dong
- Tianjin Key Laboratory of Biological Feed Additive Enterprise, S&E Burgeoning Biotechnology (Tianjin) Co., Ltd, No.27, Shengda Second Branch Road, Wangwenzhuang Industrial Park, Xiqing District, Tianjin 300383, PR China
| | - Yuan Li
- Tianjin Key Laboratory of Biological Feed Additive Enterprise, S&E Burgeoning Biotechnology (Tianjin) Co., Ltd, No.27, Shengda Second Branch Road, Wangwenzhuang Industrial Park, Xiqing District, Tianjin 300383, PR China
| | - Ding Kuo Liu
- Tianjin Key Laboratory of Biological Feed Additive Enterprise, S&E Burgeoning Biotechnology (Tianjin) Co., Ltd, No.27, Shengda Second Branch Road, Wangwenzhuang Industrial Park, Xiqing District, Tianjin 300383, PR China
| | - Hong Xia Ma
- The Engineering Research Center of Bioreactor and Drug Development, Ministry of Education, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
- The Key Laboratory of New Veterinary Drug Research and Development of Jilin Province, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| | - Ling Cong Kong
- College of Animal Science and Technology, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
- The Key Laboratory of New Veterinary Drug Research and Development of Jilin Province, Jilin Agricultural University, Xincheng Street No. 2888, Changchun 130118, PR China
| |
Collapse
|
7
|
Goray M, Taylor D, Bibbo E, Fantinato C, Fonneløp AE, Gill P, van Oorschot RAH. Emerging use of air eDNA and its application to forensic investigations - A review. Electrophoresis 2024; 45:916-932. [PMID: 38419135 DOI: 10.1002/elps.202300228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/17/2023] [Accepted: 02/19/2024] [Indexed: 03/02/2024]
Abstract
Biological material is routinely collected at crime scenes and from exhibits and is a key type of evidence during criminal investigations. Improvements in DNA technologies allow collection and profiling of trace samples, comprised of few cells, significantly expanding the types of exhibits targeted for DNA analysis to include touched surfaces. However, success rates from trace and touch DNA samples tend to be poorer compared to other biological materials such as blood. Simultaneously, there have been recent advances in the utility of environmental DNA collection (eDNA) in identification and tracking of different biological organisms and species from bacteria to naked mole rats in different environments, including, soil, ice, snow, air and aquatic. This paper examines the emerging methods and research into eDNA collection, with a special emphasis on the potential forensic applications of human DNA collection from air including challenges and further studies required to progress implementation.
Collapse
Affiliation(s)
- Mariya Goray
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Duncan Taylor
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
- Forensic Science SA, Adelaide, South Australia, Australia
| | - Emily Bibbo
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Chiara Fantinato
- Forensic Genetics Research Group, Department of Forensic Sciences, Oslo University Hospital, Oslo, Norway
- Department of Forensic Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Ane Elida Fonneløp
- Forensic Genetics Research Group, Department of Forensic Sciences, Oslo University Hospital, Oslo, Norway
- Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway
| | - Peter Gill
- Forensic Genetics Research Group, Department of Forensic Sciences, Oslo University Hospital, Oslo, Norway
- Department of Forensic Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Roland A H van Oorschot
- Victoria Police Forensic Services Department, Office of Chief Forensic Scientist, Macleod, Victoria, Australia
- School of Agriculture, Biomedicine and Environment, La Trobe University, Bundoora, Victoria, Australia
| |
Collapse
|
8
|
Hermann LA, Tur B, Köberlein MC, Gantner S, Westphalen C, Benthaus T, Döllinger M, Kniesburges S, Echternach M. Aerosol Dispersion During Different Phonatory Tasks in Amateur Singers. J Voice 2024; 38:731-740. [PMID: 34963518 DOI: 10.1016/j.jvoice.2021.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 11/18/2021] [Accepted: 11/18/2021] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Due to increased aerosol generation during singing, choir rehearsals were widely prohibited in the course of the CoVID-19 pandemic. Most studies on aerosol generation and dispersion focus on professional singers. However, it has not been clarified if these data are also representative for amateur singers. METHODS Nine non-professional singers (four male, five female) were asked to perform five tasks; speaking (T+), singing a text softly (MT-) and loudly (MT+), singing on the vowel [ə] (M+) and singing with a N95 mask (MT+N95). Before performing the tasks, the singers were asked to inhale 0.5 L vapor produced by an e-cigarette consisting of the basic liquid. The spread of the exhaled vapor was recorded in all three dimensions by high-definition cameras and the impulse dispersion was detected as a function of time. RESULTS Regarding the median dispersion to the front, all tasks showed comparable distances from 0.69 m to 0.82 m at the end of the tasks. However, the maximum aerosol dispersion showed a larger variety among different subjects or tasks, respectively. Especially in the M+ task a maximum distance of 1.96 m to the front was reached by a single subject. Although singing with a N95 mask resulted in a slightly increased median dispersion to the front, the maximum dispersion was decreased from 1.47 m (MT+) to 1.04 m (MT+N95). CONCLUSION The maximum dispersion distance to the front of 1.96 m at the end of the M+ task and 1.47 m at the end of the MT+ task showed higher values in comparison to professional singers. Differences in phonation, articulation and mouth opening could lead to greater impulse dispersion. Singing in loud phonation with a N95 mask reduced the maximum impulse dispersion to the front to 1.04 m. Taking all results into consideration, a slightly larger safety distance should be necessary for non-professional singers.
Collapse
Affiliation(s)
- Laila Ava Hermann
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Munich University Hospital (LMU), Munich, Germany
| | - Bogac Tur
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head & Neck Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Marie Christine Köberlein
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Munich University Hospital (LMU), Munich, Germany
| | - Sophia Gantner
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Munich University Hospital (LMU), Munich, Germany
| | - Caroline Westphalen
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Munich University Hospital (LMU), Munich, Germany
| | - Tobias Benthaus
- Institute and Clinic for Occupational, Social and Environmental Medicine, Munich University Hospital (LMU), Munich, Germany
| | - Michael Döllinger
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head & Neck Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Stefan Kniesburges
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head & Neck Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Matthias Echternach
- Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Munich University Hospital (LMU), Munich, Germany.
| |
Collapse
|
9
|
Nasution YN, Sitorus MY, Sukandar K, Nuraini N, Apri M, Salama N. The epidemic forest reveals the spatial pattern of the spread of acute respiratory infections in Jakarta, Indonesia. Sci Rep 2024; 14:7619. [PMID: 38556584 PMCID: PMC10982301 DOI: 10.1038/s41598-024-58390-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 03/28/2024] [Indexed: 04/02/2024] Open
Abstract
Acute respiratory infection (ARI) is a communicable disease of the respiratory tract that implies impaired breathing. The infection can expand from one to the neighboring areas at a region-scale level through a human mobility network. Specific to this study, we leverage a record of ARI incidences in four periods of outbreaks for 42 regions in Jakarta to study its spatio-temporal spread using the concept of the epidemic forest. This framework generates a forest-like graph representing an explicit spread of disease that takes the onset time, spatio-temporal distance, and case prevalence into account. To support this framework, we use logistic curves to infer the onset time of the outbreak for each region. The result shows that regions with earlier onset dates tend to have a higher burden of cases, leading to the idea that the culprits of the disease spread are those with a high load of cases. To justify this, we generate the epidemic forest for the four periods of ARI outbreaks and identify the implied dominant trees (that with the most children cases). We find that the primary infected city of the dominant tree has a relatively higher burden of cases than other trees. In addition, we can investigate the timely ( R t ) and spatial reproduction number ( R c ) by directly evaluating them from the inferred graphs. We find that R t for dominant trees are significantly higher than non-dominant trees across all periods, with regions in western Jakarta tend to have higher values of R c . Lastly, we provide simulated-implied graphs by suppressing 50% load of cases of the primary infected city in the dominant tree that results in a reduced R c , suggesting a potential target of intervention to depress the overall ARI spread.
Collapse
Affiliation(s)
- Yuki Novia Nasution
- Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
| | - Marli Yehezkiel Sitorus
- Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
| | - Kamal Sukandar
- Department of Mathematics, Imperial College London, London, SW7 2RH, United Kingdom
| | - Nuning Nuraini
- Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia.
| | - Mochamad Apri
- Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
| | - Ngabila Salama
- DKI Jakarta Provincial Health Office, Jakarta, Indonesia
| |
Collapse
|
10
|
Collins JR, Rodríguez N, Soto S, Ionescu AC, Brambilla E, Garcia-Godoy F. Effect of open windows on airborne contamination and its topographical distribution in the dental operatory. Eur J Oral Sci 2023; 131:e12954. [PMID: 37743225 DOI: 10.1111/eos.12954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 09/04/2023] [Indexed: 09/26/2023]
Abstract
Aerosols produced by dental handpieces represent a permanent risk of disease transmission in the dental environment. The current study evaluated the effects of natural ventilation (open windows) on Streptococcus mutans airborne contamination by dental handpieces in simulated clinical conditions. A dental phantom was placed on a dental chair at a standard university dental clinic operatory. An S. mutans suspension was infused into the phantom's mouth while an operator performed standardized dental procedures using low (contra-angle) and high speed (turbine) dental handpieces or an ultrasonic scaler, with windows open or closed. Selective medium Petri dishes were placed in 18 sites of the operatory environment to evaluate contamination topographically. Sites were clustered as: wall, floor, ceiling, dental chair, and cabinet. Contamination was expressed as log10 CFU/cm2 . A linear mixed model analysis was used, nesting the sites within each ventilation and handpiece combination. Open windows significantly reduced contamination. The high-speed handpiece provided the highest contamination, followed by the ultrasonic scaler and the low-speed handpiece. Contamination values were much smaller at the ceiling, and much larger at the chair. Opening windows produced more homogeneous contamination of the operatory compared to closed windows. Natural ventilation during dental procedures decreases contamination and affects its topographical distribution.
Collapse
Affiliation(s)
- James R Collins
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra, Santo Domingo, Dominican Republic
| | - Nathaly Rodríguez
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra, Santo Domingo, Dominican Republic
| | - Silvia Soto
- Department of Periodontology, School of Dentistry, Pontificia Universidad Católica Madre y Maestra, Santo Domingo, Dominican Republic
| | - Andrei C Ionescu
- Oral Microbiology and Biomaterials Laboratory, Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Eugenio Brambilla
- Oral Microbiology and Biomaterials Laboratory, Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
| | - Franklin Garcia-Godoy
- Bioscience Research Center, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN and The Forsyth Institute, Cambridge, Massachusetts, USA
| |
Collapse
|
11
|
Kumar MS, He R, Feng L, Olin P, Chew HP, Jardine P, Anderson GC, Hong J. Particle generation and dispersion from high-speed dental drilling. Clin Oral Investig 2023; 27:5439-5448. [PMID: 37479870 DOI: 10.1007/s00784-023-05163-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 07/13/2023] [Indexed: 07/23/2023]
Abstract
OBJECTIVE To investigate the characteristics of particle generation and dispersion during dental procedure using digital inline holography (DIH) METHODS: Particles at two locations, near-field and far-field, which represent the field closer to the procedure location and within 0.5 m from the procedure location respectively, are studied using two different DIH systems. The effect of three parameters namely rotational speed, coolant flow rate, and bur angle on particle generation and dispersion are evaluated by using 10 different operating conditions. The particle characteristics at different operating conditions are estimated from the holograms using machine learning-based analysis. RESULTS The particle concentration decreased by at least two orders of magnitude between the near-field and far-field locations across the 10 different operating conditions, indicating significant dispersion of the particles. High rotational speed is found to produce a larger number of smaller particles, while lower rotational speeds generate larger particles. Coolant flow rate is found to have a greater impact on particle transport to the far-field location. Irregular shape dental particles account for 29% of total particles at far-field location, with the majority of these irregular shape particles having diameters ranging from 12 to 18 μm. CONCLUSIONS All three parameters have significant effects on particle generation and dispersion, with rotational speed having a more significant influence on particle generation at near-field and coolant flow rate playing a more important role on particle transport to the far-field. CLINICAL RELEVANCE This study provides valuable insights on particle characteristics during high-speed drilling. It can help dental professionals minimize exposure risks for themselves and patients by optimizing clinical operating conditions.
Collapse
Affiliation(s)
- M Shyam Kumar
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA
| | - Ruichen He
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA
- Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, USA
| | - Lei Feng
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA
- Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, USA
| | - Paul Olin
- University of Minnesota School of Dentistry, Minneapolis, MN, USA
| | - Hooi Pin Chew
- University of Minnesota School of Dentistry, Minneapolis, MN, USA
| | - Paul Jardine
- University of Minnesota School of Dentistry, Minneapolis, MN, USA
| | - Gary C Anderson
- University of Minnesota School of Dentistry, Minneapolis, MN, USA
| | - Jiarong Hong
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA.
- Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, USA.
| |
Collapse
|
12
|
Marco L, Cambien G, Garcia M, Broutin L, Cateau E, Lariviere A, Castel O, Thevenot S, Bousseau A. [Respiratory infections: Additional transmission-based precautions in healthcare facilities]. Rev Mal Respir 2023; 40:572-603. [PMID: 37365075 DOI: 10.1016/j.rmr.2023.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 05/04/2023] [Indexed: 06/28/2023]
Abstract
INTRODUCTION In health care, measures against cross-transmission of microorganisms are codified by standard precautions, and if necessary, they are supplemented by additional precautions. STATE OF THE ART Several factors impact transmission of microorganisms via the respiratory route: size and quantity of the emitted particles, environmental conditions, nature and pathogenicity of the microorganisms, and degree of host receptivity. While some microorganisms necessitate additional airborne or droplet precautions, others do not. PROSPECTS For most microorganisms, transmission patterns are well-understood and transmission-based precautions are well-established. For others, measures to prevent cross-transmission in healthcare facilities remain under discussion. CONCLUSIONS Standard precautions are essential to the prevention of microorganism transmission. Understanding of the modalities of microorganism transmission is essential to implementation of additional transmission-based precautions, particularly in view of opting for appropriate respiratory protection.
Collapse
Affiliation(s)
- L Marco
- Unité d'hygiène hospitalière, département des agents infectieux, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France
| | - G Cambien
- Unité d'hygiène hospitalière, département des agents infectieux, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France; Inserm CIC 1402, université de Poitiers, CHU de Poitiers, 86021 Poitiers, France
| | - M Garcia
- Département des agents infectieux, laboratoire de virologie et mycobactériologie, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France; Laboratoire inflammation, tissus épithéliaux et cytokines, EA 4331, université de Poitiers, 86021 Poitiers, France
| | - L Broutin
- Département des agents infectieux, laboratoire de bactériologie, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France
| | - E Cateau
- Laboratoire écologie et biologie des interactions, UMR CNRS 7267, université de Poitiers, 86021 Poitiers, France; Département des agents infectieux, laboratoire de parasitologie et mycologie médicale, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France
| | - A Lariviere
- Département des agents infectieux, laboratoire de virologie et mycobactériologie, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France
| | - O Castel
- Unité d'hygiène hospitalière, département des agents infectieux, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France
| | - S Thevenot
- Unité d'hygiène hospitalière, département des agents infectieux, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France; Inserm CIC 1402, université de Poitiers, CHU de Poitiers, 86021 Poitiers, France
| | - A Bousseau
- Unité d'hygiène hospitalière, département des agents infectieux, pôle BIOSPHARM, CHU de Poitiers, 86021 Poitiers, France.
| |
Collapse
|
13
|
Balasubaramanian S, Cyriac R, Roshan S, Maruthamuthu Paramasivam K, Chellanthara Jose B. An effective stacked autoencoder based depth separable convolutional neural network model for face mask detection. ARRAY 2023; 19:100294. [PMID: 37293577 PMCID: PMC10239736 DOI: 10.1016/j.array.2023.100294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 05/08/2023] [Accepted: 05/14/2023] [Indexed: 06/10/2023] Open
Abstract
The COVID-19 pandemic has been infecting the entire world over the past years. To prevent the spread of COVID-19, people have acclimatised to the new normal, which includes working from home, communicating online, and maintaining personal cleanliness. There are numerous tools required to prepare to compact transmissions in the future. One of these elements for protecting individuals from fatal virus transmission is the mask. Studies have indicated that wearing a mask may help to reduce the risk of viral transmission of all kinds. It causes many public places to take efforts to ensure that its guests wear adequate face masks and keep a safe distance from one another. Screening systems need to be installed at the doors of businesses, schools, government buildings, private offices, and/or other important areas. A variety of face detection models have been designed using various algorithms and techniques. Most of the articles in the previously published research have not worked on dimensionality reduction in conjunction with depth-wise separable neural networks. The necessity of determining the identities of people who do not cover their faces when they are in public is the driving factor for the development of this methodology. This research work proposes a deep learning technique to determine if a person is wearing mask or not and identifies whether it is properly worn or not. Stacked Auto Encoder (SAE) technique is implemented by stacking the following components: Principal Component Analysis (PCA) and Depth-wise Separable Convolutional Neural Network (DWSC-NN). PCA is used to reduce the irrelevant features in the images and resulted high true positive rate in the detection of mask. We achieved an accuracy score of 94.16% and an F1 score of 96.009% by the application of the method described in this research.
Collapse
Affiliation(s)
| | - Robin Cyriac
- University of Technology and Applied Sciences - Al Mussanah, Department of Information Technology, Al Muladdah, 314, South Al Batinah, Oman
| | - Sahana Roshan
- University of Technology and Applied Sciences - Al Mussanah, Department of Information Technology, Al Muladdah, 314, South Al Batinah, Oman
| | | | - Boby Chellanthara Jose
- University of Technology and Applied Sciences - Al Mussanah, Department of Information Technology, Al Muladdah, 314, South Al Batinah, Oman
| |
Collapse
|
14
|
Römmele C, Kahn M, Zellmer S, Muzalyova A, Hammel G, Bartenschlager C, Beyer A, Rosendahl J, Schlittenbauer T, Zenk J, Al-Nawas B, Frankenberger R, Hoffmann J, Arens C, Lammert F, Traidl-Hoffmann C, Messmann H, Ebigbo A. Factors associated with an increased risk of SARS-CoV-2 infection in healthcare workers in aerosol-generating disciplines. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2023; 61:1009-1017. [PMID: 35878605 DOI: 10.1055/a-1845-2979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
BACKGROUND Healthcare workers (HCWs) are at a high risk of SARS-CoV-2 infection due to exposure to potentially infectious material, especially during aerosol-generating procedures (AGP). We aimed to investigate risk factors for SARS-CoV-2 infection among HCWs in medical disciplines with AGP. METHODS A nationwide questionnaire-based study in private practices and hospital settings was conducted between 12/16/2020 and 01/24/2021. Data on SARS-CoV-2 infections among HCWs and potential risk factors of infection were investigated. RESULTS 2070 healthcare facilities with 25113 employees were included in the study. The overall infection rate among HCWs was 4.7%. Multivariate analysis showed that regions with higher incidence rates had a significantly increased risk of infection. Furthermore, hospital setting and HCWs in gastrointestinal endoscopy (GIE) had more than double the risk of infection (OR 2.63; 95% CI 2.50-2.82, p<0.01 and OR 2.35; 95% CI 2.25-2.50, p<0.01). For medical facilities who treated confirmed SARS-CoV-2 cases, there was a tendency towards higher risk of infection (OR 1.39; 95% CI 1.11-1.63, p=0.068). CONCLUSION Both factors within and outside medical facilities appear to be associated with an increased risk of infection among HCWs. Therefore, GIE and healthcare delivery setting were related to increased infection rates. Regions with higher SARS-CoV-2 incidence rates were also significantly associated with increased risk of infection.
Collapse
Affiliation(s)
- Christoph Römmele
- III. Medizinische Klinik - Gastroenterologie und Infektiologie, Universitätsklinikum Augsburg, Augsburg, Germany
| | - Maria Kahn
- Hospital for Internal Medicine III - Gastroenterology and Infectious Diseases, University Hospital Augsburg, Augsburg, Germany
| | - Stephan Zellmer
- Hospital for Internal Medicine III - Gastroenterology and Infectious Diseases, University Hospital Augsburg, Augsburg, Germany
| | - Anna Muzalyova
- Hospital for Internal Medicine III - Gastroenterology and Infectious Diseases, University Hospital Augsburg, Augsburg, Germany
| | - Gertrud Hammel
- Helmholtz Center Munich German Research Center for Environmental Health, Neuherberg, Germany
| | - Christina Bartenschlager
- Chair of Health Care Operations/Health Information Management, University of Augsburg, Augsburg, Germany
| | - Albert Beyer
- Medical Practice for Gastroenterology and Gastrointestinal Oncology, Altötting, Germany
| | - Jonas Rosendahl
- Clinic for Internal Medicine I, University Hospital Halle, Halle, Germany
| | - Tilo Schlittenbauer
- Department of Oral and Maxillofacial Surgery, University Hospital Augsburg, Augsburg, Germany
| | - Johannes Zenk
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Augsburg, Augsburg, Germany
| | - Bilal Al-Nawas
- University Hospital Center Mainz Department of Otorhinolaryngology Head and Neck Surgery, Mainz, Germany
| | - Roland Frankenberger
- Department for Operative Dentistry, Endodontics, and Pediatric Dentistry, Philipps-Universitat Marburg, Marburg, Germany
| | - Juergen Hoffmann
- Department of Oral and Maxillofacial Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Christoph Arens
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Magdeburg, Magdeburg, Germany
| | - Frank Lammert
- Department of Medicine II, Saarland University Hospital and Saarland University Faculty of Medicine, Homburg, Germany
- Hannover Medical School, Hannover, Germany
| | - Claudia Traidl-Hoffmann
- Department of Environmental Medicine, University of Augsburg Faculty of Medicine, Augsburg, Germany
| | - Helmut Messmann
- Department of Gastroenterology, Universitätsklinikum Augsburg, Augsburg, Germany
| | - Alanna Ebigbo
- III Medizinische Klinik, Universitätsklinikum Augsburg, Augsburg, Germany
| |
Collapse
|
15
|
Md Khairi LNH, Gnanasan S. Emerging Roles of Malaysian Pharmacists in Asthma Management Amidst the COVID-19 Pandemic: A Narrative Review. Malays J Med Sci 2023; 30:33-47. [PMID: 37655143 PMCID: PMC10467601 DOI: 10.21315/mjms2023.30.4.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 03/01/2022] [Indexed: 09/02/2023] Open
Abstract
The arrival of COVID-19 pandemic in March 2020 adversely affected every aspect of human life, including the management of asthma. The pandemic has forced clinicians to revisit the application of high-risk aerosol-generating procedures in asthma management, including spirometry and nebuliser therapy. The use of commercial spacers with pressurised metered-dose inhalers to replace nebulisation is limited by the high cost and pandemic-induced stock unavailability of these inhalers. The need for social distancing, healthcare reserves reallocation, and scarce personal protective equipment has promote increased telemedicine uptake for patients' asthma control and monitoring. Malaysian pharmacists have been providing long-term care of asthma through the introduction of the respiratory Medication Therapy Adherence Clinic (MTAC) to empower patients' general health literacy, train and regularly evaluate their inhalation technique, and reinforce the importance of medication compliance. To minimise the use of unplanned healthcare resources and avoidable COVID-19 infection exposure, Malaysian pharmacists need to better support asthma self-management via increased uptake of written Asthma Action Plans (AAPs). Pharmacist-led asthma treatment step-down to attain the lowest effective dose of inhaled corticosteroids (ICS) has become increasingly relevant during the pandemic, as its prolonged use carries risk of numerous side effects and possible hospitalisation. Telepharmacy offers a promising model for exploration and an alternative to the traditional service delivery of asthma education. Despite not being authorised as vaccinators, Malaysian pharmacists hold strong positions in COVID-19 immunisation programmes for pharmacovigilance and advocacy. The pandemic demands an increased role for pharmacists within medication management to prevent patients from the stockpiling that can cause adverse effects on pharmaceutical supply chain. This review intends to summarise the impact of COVID-19 on asthma management, with a focus on the transitional roles of Malaysian pharmacists before and after the pandemic era.
Collapse
Affiliation(s)
- Lukman Nul Hakim Md Khairi
- Department of Clinical Pharmacy, Faculty of Pharmacy, Universiti Teknologi MARA, Selangor, Malaysia
- Department of Pharmacy, Hospital Sultanah Nur Zahirah, Ministry of Health Malaysia, Terengganu, Malaysia
| | - Shubashini Gnanasan
- Department of Clinical Pharmacy, Faculty of Pharmacy, Universiti Teknologi MARA, Selangor, Malaysia
| |
Collapse
|
16
|
Siebler L, Rathje T, Calandri M, Stergiaropoulos K, Donker T, Richter B, Spahn C, Nusseck M. A coupled experimental and statistical approach for an assessment of SARS-CoV-2 infection risk at indoor event locations. BMC Public Health 2023; 23:1394. [PMID: 37474924 PMCID: PMC10357618 DOI: 10.1186/s12889-023-16154-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 06/19/2023] [Indexed: 07/22/2023] Open
Abstract
Indoor event locations are particularly affected by the SARS-CoV-2 pandemic. At large venues, only incomplete risk assessments exist, whereby no suitable measures can be derived. In this study, a physical and data-driven statistical model for a comprehensive infection risk assessment has been developed. At venues displacement ventilation concepts are often implemented. Here simplified theoretical assumptions fail for the prediction of relevant airflows for airborne transmission processes. Thus, with locally resolving trace gas measurements infection risks are computed more detailed. Coupled with epidemiological data such as incidences, vaccination rates, test sensitivities, and audience characteristics such as masks and age distribution, predictions of new infections (mean), situational R-values (mean), and individual risks on- and off-seat can be achieved for the first time. Using the Stuttgart State Opera as an example, the functioning of the model and its plausibility are tested and a sensitivity analysis is performed with regard to masks and tests. Besides a reference scenario on 2022-11-29, a maximum safety scenario with an obligation of FFP2 masks and rapid antigen tests as well as a minimum safety scenario without masks and tests are investigated. For these scenarios the new infections (mean) are 10.6, 0.25 and 13.0, respectively. The situational R-values (mean) - number of new infections caused by a single infectious person in a certain situation - are 2.75, 0.32 and 3.39, respectively. Besides these results a clustered consideration divided by age, masks and whether infections occur on-seat or off-seat are presented. In conclusion this provides an instrument that can enable policymakers and operators to take appropriate measures to control pandemics despite ongoing mass gathering events.
Collapse
Affiliation(s)
- Lukas Siebler
- Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE), University of Stuttgart, Pfaffenwaldring 35, Stuttgart, 70569, Baden-Württemberg, Germany.
| | - Torben Rathje
- Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE), University of Stuttgart, Pfaffenwaldring 35, Stuttgart, 70569, Baden-Württemberg, Germany
| | - Maurizio Calandri
- Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE), University of Stuttgart, Pfaffenwaldring 35, Stuttgart, 70569, Baden-Württemberg, Germany
| | - Konstantinos Stergiaropoulos
- Institute for Building Energetics, Thermotechnology and Energy Storage (IGTE), University of Stuttgart, Pfaffenwaldring 35, Stuttgart, 70569, Baden-Württemberg, Germany
| | - Tjibbe Donker
- Institute for Infection Prevention and Hospital Epidemiology, University Medical Center Freiburg, Breisacher Straße 115 B, Freiburg, 79106, Baden-Württemberg, Germany
| | - Bernhard Richter
- Freiburg Institute for Musicians' Medicine, University of Music Freiburg, University Medical Center Freiburg, Medical Faculty of the Albert-Ludwigs-University Freiburg, Freiburg Center for Research and Teaching in Music, Germany, Elsässer Straße 2m, Freiburg, 79110, Baden-Württemberg, Germany
| | - Claudia Spahn
- Freiburg Institute for Musicians' Medicine, University of Music Freiburg, University Medical Center Freiburg, Medical Faculty of the Albert-Ludwigs-University Freiburg, Freiburg Center for Research and Teaching in Music, Germany, Elsässer Straße 2m, Freiburg, 79110, Baden-Württemberg, Germany
| | - Manfred Nusseck
- Freiburg Institute for Musicians' Medicine, University of Music Freiburg, University Medical Center Freiburg, Medical Faculty of the Albert-Ludwigs-University Freiburg, Freiburg Center for Research and Teaching in Music, Germany, Elsässer Straße 2m, Freiburg, 79110, Baden-Württemberg, Germany
| |
Collapse
|
17
|
Faria ATRD, Omairi TW, Krubniki BR, Silva BL, Micelli-Neto O, Taglieri E, Ardengh JC. THE IMPACT OF THE COVID-19 PANDEMIC ON ENDOSCOPIC ULTRASOUND PROCEDURES IN A HIGH-VOLUME ENDOSCOPY UNIT IN BRAZIL. ARQUIVOS DE GASTROENTEROLOGIA 2023; 60:364-372. [PMID: 37792767 DOI: 10.1590/s0004-2803.230302023-75] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 07/27/2023] [Indexed: 10/06/2023]
Abstract
•In pancreatic neoplasms the EUS plays a key role in the management. •During the pandemic period, lockdown measures prevented patients with comorbidities from performing EUS. •The D-EUS decreased during COVID-19, while I-EUS increased and EUS-TA was the most commonly I-EUS procedure performed, with no increase in adverse events. •Despite the moderate impact of the pandemic period in endoscopic services around the world, EUS-TA of solid and cystic tumors of the pancreas was the main indication. Background - Reports of the impact of the 2020 COVID-19 pandemic period/2020 on endoscopic ultrasound (EUS) are scarce. Objective - We analyzed the impact of the pandemic period/2020 on the demographics, indications, and number of diagnostic EUS (D-EUS) and interventional EUS (I-EUS) procedures performed in a high-volume endoscopy unit compared with the previous non-pandemic period/2019. Methods - We retrospectively reviewed the medical records of all patients undergoing D-EUS or I-EUS from March 1, 2019, to February 29, 2020 (non-pandemic period/2019) and from March 1, 2020, to February 28, 2021 (pandemic period/2020). Data compared between the study periods included sex, age, comorbidities, EUS findings and diagnosis, need for interventional procedures during EUS, and adverse events (AEs). Results were significant at P<0.05. Results - EUS procedures decreased from 475 in the non-pandemic period/2019 to 289 in the pandemic period/2020, accounting for a 39% reduction. In non-pandemic period/2019, 388 (81.7%) D-EUS and 88 (18.5%) I-EUS were performed, against 206 (71.3%) D-EUS and 83 (28.7%) I-EUS in pandemic period/2020 (P=0.001). Only 5/289 (1.7%) patients had COVID-19. Fewer patients with comorbidities underwent EUS during pandemic period/2020 due to lockdown measures (P<0.001). D-EUS decreased, whereas I-EUS increased (P<0.001). EUS-guided tissue acquisition (EUS-TA) was the most common I-EUS, performed in 83/289 (28.7%) patients in pandemic period/2020, against 88/475 (18.5%) in non-pandemic period/2019 (P=0.001). AEs did not differ significantly between the study periods. Conclusion - Pandemic Period/2020 had a moderate impact on reducing EUS procedures due to the risks involved. Although I-EUS increased, EUS-related AEs did not. Solid and cystic pancreatic tumors remained a major indication for EUS-TA even during the pandemic period/2020.
Collapse
Affiliation(s)
| | | | | | | | - Otávio Micelli-Neto
- Hospital Moriah, Unidade de Endoscopia, São Paulo, SP, Brasil
- Hospital A.C.Camargo Cancer Center, Unidade de Endoscopia, São Paulo, SP, Brasil
| | - Eloy Taglieri
- Hospital A.C.Camargo Cancer Center, Unidade de Endoscopia, São Paulo, SP, Brasil
| | - José Celso Ardengh
- Hospital Moriah, Unidade de Endoscopia, São Paulo, SP, Brasil
- Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo, Departamento de Cirurgia e Anatomia, Divisão de Cirurgia Gastrointestinal, Ribeirão Preto, SP, Brasil
- Universidade Federal de São Paulo, Departamento de Diagnóstico por Imagem, São Paulo, SP, Brasil
| |
Collapse
|
18
|
Tsang TW, Mui KW, Wong LT, Law KY, Shek KW. A Novel IoT-Enabled Wireless Sensor Grid for Spatial and Temporal Evaluation of Tracer Gas Dispersion. SENSORS (BASEL, SWITZERLAND) 2023; 23:3920. [PMID: 37112265 PMCID: PMC10145748 DOI: 10.3390/s23083920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/07/2023] [Accepted: 04/11/2023] [Indexed: 06/19/2023]
Abstract
Current IoT applications in indoor air focus mainly on general monitoring. This study proposed a novel IoT application to evaluate airflow patterns and ventilation performance using tracer gas. The tracer gas is a surrogate for small-size particles and bioaerosols and is used in dispersion and ventilation studies. Prevalent commercial tracer-gas-measuring instruments, although highly accurate, are relatively expensive, have a long sampling cycle, and are limited in the number of sampling points. To enhance the spatial and temporal understanding of tracer gas dispersion under the influence of ventilation, a novel application of an IoT-enabled, wireless R134a sensing network using commercially available small sensors was proposed. The system has a detection range of 5-100 ppm and a sampling cycle of 10 s. Using Wi-Fi communication, the measurement data are transmitted to and stored in a cloud database for remote, real-time analysis. The novel system provides a quick response, detailed spatial and temporal profiles of the tracer gas level, and a comparable air change rate analysis. With multiple units deployed as a wireless sensing network, the system can be applied as an affordable alternative to traditional tracer gas systems to identify the dispersion pathway of the tracer gas and the general airflow direction.
Collapse
Affiliation(s)
- Tsz-Wun Tsang
- Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Kwok-Wai Mui
- Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Ling-Tim Wong
- Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Kwok-Yung Law
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Ka-Wing Shek
- Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| |
Collapse
|
19
|
Zhang L, Guo Y, Tie J, Yao Z, Feng Z, Wu Q, Wang X, Luo H. Grating-like DBD plasma for air disinfection: Dose and dose-response characteristics. JOURNAL OF HAZARDOUS MATERIALS 2023; 447:130780. [PMID: 36669408 DOI: 10.1016/j.jhazmat.2023.130780] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/02/2023] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
Atmospheric pressure dielectric barrier discharge (DBD) plasma is an emerging technique for effective bioaerosol decontamination and is promising to be used in indoor environments to reduce infections. However, fundamental knowledge of the dose and dose-response characteristics of plasma-based disinfection technology is very limited. By examining the single-pass removal efficiency of S. lentus aerosol by in-duct grating-like DBD plasma reactors with varied discharge setups (gap distance, electrode size, number of discharge layers, frequency, dielectric material), it was found that the specific input energy (SIE) could be served as the dose for disinfection, and the efficiency was exponentially dependent on SIE in most cases. The corresponding susceptibility constants (Z values) were obtained hereinafter. Humidity was a prominent factor boosting the efficiency with a Z value of 0.36 L/J at relative humidity (RH) of 20% and 1.68 L/J at RH of 60%. MS2 phage showed a much higher efficiency of 2.66-3.08 log10 of reduction than those of S. lentus (38-85%) and E. coli (42%-95%) under the same condition. Using SIE as the dose, the performance of plasma reactors in the literature was compared and evaluated. This work provides a theoretical and engineering basis for air disinfection by plasma-based technology.
Collapse
Affiliation(s)
- Liyang Zhang
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Yuntao Guo
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
| | - Jinfeng Tie
- Disinfection and Infection Control, Chinese PLA Center for Disease Prevention and Control, Beijing 100071, China.
| | - Zenghui Yao
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Zihao Feng
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Qiong Wu
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Xinxin Wang
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Haiyun Luo
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China.
| |
Collapse
|
20
|
Liu Z, Lv J, Zhang Z, Ma J, Song Y, Wu M, Cao G, Guo J. Three Experimental Common High-Risk Procedures: Emission Characteristics Identification and Source Intensity Estimation in Biosafety Laboratory. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4479. [PMID: 36901493 PMCID: PMC10002466 DOI: 10.3390/ijerph20054479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/19/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Biosafety laboratory is an important place to study high-risk microbes. In biosafety laboratories, with the outbreak of infectious diseases such as COVID-19, experimental activities have become increasingly frequent, and the risk of exposure to bioaerosols has increased. To explore the exposure risk of biosafety laboratories, the intensity and emission characteristics of laboratory risk factors were investigated. In this study, high-risk microbe samples were substituted with Serratia marcescens as the model bacteria. The resulting concentration and particle size segregation of the bioaerosol produced by three experimental procedures (spill, injection, and sample drop) were monitored, and the emission sources' intensity were quantitatively analyzed. The results showed that the aerosol concentration produced by injection and sample drop was 103 CFU/m3, and that by sample spill was 102 CFU/m3. The particle size of bioaerosol is mainly segregated in the range of 3.3-4.7 μm. There are significant differences in the influence of risk factors on source intensity. The intensity of sample spill, injection, and sample drop source is 3.6 CFU/s, 78.2 CFU/s, and 664 CFU/s. This study could provide suggestions for risk assessment of experimental operation procedures and experimental personnel protection.
Collapse
Affiliation(s)
- Zhijian Liu
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Jiabin Lv
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Zheng Zhang
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Juntao Ma
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Yangfan Song
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Minnan Wu
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Guoqing Cao
- Institute of Building Environment and Energy, China Academy of Building Research, Beijing 100013, China
| | - Jiacheng Guo
- Department of Power Engineering, North China Electric Power University, Baoding 071003, China
| |
Collapse
|
21
|
Chao I, Lee S, Brenker J, Wong D, Low C, Desselle M, Bernard A, Alan T, Keon-Cohen Z, Coles-Black J. The effect of clinical face shields on aerosolized particle exposure. JOURNAL OF 3D PRINTING IN MEDICINE 2023; 7:3DP2. [PMID: 38051985 PMCID: PMC9870239 DOI: 10.2217/3dp-2022-0016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 11/16/2022] [Indexed: 12/07/2023]
Abstract
Background Face shields protect healthcare workers (HCWs) from fluid and large droplet contamination. Their effect on smaller aerosolized particles is unknown. Materials & methods An ultrasonic atomizer was used to simulate particle sizes equivalent to human breathing and forceful cough. Particles were measured at positions correlating to anesthetic personnel in relation to a patient inside an operating theatre environment. The effect of the application of face shields on HCW exposure was measured. Results & Conclusion Significant reductions in particle concentrations were measured after the application of vented and enclosed face shields. Face shields appear to reduce the concentration of aerosolized particles that HCWs are exposed to, thereby potentially conferring further protection against exposure to aerosolized particles in an operating theatre environment.
Collapse
Affiliation(s)
- Ian Chao
- Department of Anaesthesia, Box Hill Hospital, Eastern Health, Melbourne, Australia
| | - Sarah Lee
- Department of Anaesthesia, Box Hill Hospital, Eastern Health, Melbourne, 3128, Australia
| | - Jason Brenker
- Department of Mechanical & Aerospace Engineering, Monash University, Melbourne, 3800, Australia
| | - Derrick Wong
- Department of Anaesthesia, Box Hill Hospital, Eastern Health, Melbourne, Australia
| | - Caitlin Low
- Department of Anaesthesia, Box Hill Hospital, Eastern Health, Melbourne, Australia
| | - Mathilde Desselle
- Herston Biofabrication Institute, Metro North Hospital & Health Service, Herston, Queensland, 4029, Australia
| | - Anne Bernard
- QCIF Facility for Advanced Bioinformatics, St Lucia, Queensland, 4072, Australia
| | - Tuncay Alan
- Department of Mechanical & Aerospace Engineering, Monash University, Melbourne, 3800, Australia
| | - Zoe Keon-Cohen
- Department of Anaesthesia, Box Hill Hospital, Eastern Health, Melbourne, Australia
| | | |
Collapse
|
22
|
Alzeer AH, Somily A, Aldosari KM, Ahamed SS, Saadon AHA, Mohamed DH. Microbial surveillance of Hajj tents: Bioaerosol sampling coupled with real-time multiplex PCR. Am J Infect Control 2023; 51:199-204. [PMID: 35659560 DOI: 10.1016/j.ajic.2022.05.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/26/2022] [Accepted: 05/26/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND Respiratory tract infections are common among pilgrims attending annual Hajj in Mecca, Saudi Arabia. Pilgrims typically spend most of the Hajj period inside ventilated tents, where microorganisms may be transmitted through bioaerosols and droplets. OBJECTIVE To perform microorganism surveillance inside Hajj tents and assess the similarities between microorganisms isolated from tent bioaerosol samples and nasopharyngeal swabs (NP) of tent occupants. METHODS Respiratory microorganisms in bioaerosols collected from Hajj tents over a 4-day period were compared with NP of tent occupants using real-time multiplex polymerase chain reaction analysis. RESULTS A total of 152 samples were collected: 120 tent bioaerosol samples collected on days 9, 10, 11, and 12 of Dhu al-Hijjah, and 32 NP collected on day 12 of Dhu al-Hijjah (corresponding to 23/08/2018). Eighty-three (69.2%) bioaerosol samples tested positive for at least 1 microorganism, with the number of pathogens increasing over the 4 days of sampling. Twenty-seven (84.38%) NP swabs from tent occupants also tested positive. Microorganisms identified in pilgrim nasal carriage and tent bioaerosol samples were similar, and included K. pneumonia, S. aureus, S. pneumonia, human adenovirus, Moraxella, influenza A, and H. influenza. CONCLUSIONS The data suggest that the Hajj tent environment may contribute to the spread of airborne infections during Hajj. This can have important ramifications for novel pathogens with pandemic potential.
Collapse
Affiliation(s)
- Abdulaziz H Alzeer
- Department of Critical Care, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
| | - Ali Somily
- Microbiology Division, Department of Pathology and Laboratory Medicine, College of Medicine, King Saud University Riyadh, Riyadh, Saudi Arabia
| | - Kamel Mohamed Aldosari
- Laboratories & Blood Banks, Riyadh Health Affairs, Ministry of Health, Riyadh, Saudi Arabia
| | - Shaik Shaffi Ahamed
- Department of Family & Community Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
| | - Abdalrhman H Al Saadon
- Department of Critical Care, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Deqa Hassan Mohamed
- Microbiology Division, Department of Pathology and Laboratory Medicine, College of Medicine, King Saud University Riyadh, Riyadh, Saudi Arabia
| |
Collapse
|
23
|
Li X, Sun B, Lyu K, Chen J, Zhang Y, Sun Y, Li C, Sui T, Wang X, Hu Y, Wang Q, Xu D. Research on the relationship between architectural features in northeast China and vertical aerosol transmission of COVID-19. Front Public Health 2023; 10:1052610. [PMID: 36711357 PMCID: PMC9881651 DOI: 10.3389/fpubh.2022.1052610] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 12/19/2022] [Indexed: 01/15/2023] Open
Abstract
During the COVID-19 pandemic, many buildings in northeast China have had clusters of infected cases in the vertical layout. There is speculation that vertical aerosol transmission occurs. The houses in northeast China are airtight, and range hoods may be used for a long period of time when cooking. The pathway and factors influencing vertical aerosol transmission are worth studying. To elucidate a viral aerosol transmission pathway, we selected a multistory apartment and a high-rise building in Changchun city, Jilin province, China, to conduct an in-depth investigation and on-site simulation experiments. According to epidemiological investigation information on infected cases, building structures, drainage, ventilation, etc., we used fluorescent microspheres to simulate the behaviors of infected people, such as breathing and flushing the toilet after defecation, to discharge simulated viruses and track and monitor them. The field simulation experiment confirmed the transmission of fluorescent microsphere aerosols to other rooms in two types of buildings using a vertical aerosol transmission pathway of toilet flush-sewage pipe-floor drain without a water seal. Our study showed that, in the absence of a U-shaped trap or floor drain water seal whether in a multistory apartment or high-rise residential building, there is a transmission pathway of "excretion of virus through feces-toilet flushing-sewage pipe-floor drain without water seal," which will cause the vertical transmission of viral aerosol across floors during the COVID-19 pandemic. Moreover, the negative pressure generated by turning on the range hood when closing doors and windows increase aerosol transmission. Based on this negative pressure, prevention and control measures for residential buildings in northeast China during the COVID-19 pandemic were proposed.
Collapse
Affiliation(s)
- Xia Li
- China CDC Key Laboratory of Environment and Population Health, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Bingxin Sun
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Keyang Lyu
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Jiayu Chen
- Shandong Provincial Third Hospital, Jinan, Shandong, China
| | - Yunjian Zhang
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Yu Sun
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Chenguang Li
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Tianzhuo Sui
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Xinxin Wang
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Yu Hu
- Changchun Center for Disease Control and Prevention, Changchun, Jilin, China
| | - Qin Wang
- China CDC Key Laboratory of Environment and Population Health, National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China,*Correspondence: Qin Wang ✉
| | - Dongqun Xu
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China,Dongqun Xu ✉
| |
Collapse
|
24
|
Rasheed A, Hegde O, Chatterjee R, Sampathirao SR, Chakravortty D, Basu S. Physics of self-assembly and morpho-topological changes of Klebsiella pneumoniae in desiccating sessile droplets. J Colloid Interface Sci 2023; 629:620-631. [PMID: 36183643 DOI: 10.1016/j.jcis.2022.09.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 09/10/2022] [Accepted: 09/19/2022] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS The bacteria suspended in pure water self-assemble into unique patterns depending on bacteria-bacteria, bacteria-substrate and bacteria-liquid interactions. The physical forces acting on bacteria vary based on their respective spatial location inside the droplet cause an assorted magnitude of physical stress. The shear and dehydration induced stress on pathogens(bacteria) in drying bio-fluid droplets alters the viability and infectivity. EXPERIMENTS We have investigated the flow and desiccation-driven self-assembly of Klebsiella pneumoniae in the naturally evaporating sessile droplets. Klebsiella pneumoniae exhibits extensive changes in its morphology and forms unique patterns as the droplet dries, revealing hitherto unexplored rich physics governing its survival and infection strategies. Self-assembly of bacteria at the droplet contact line is characterized by order-to-disorder packing transitions with high packing densities and excessive deformations (analysed using scanning electron microscopy and atomic force microscopy). In contrast, thin-film instability-led hole formation at the center of the droplet engenders spatial packing of bacteria analogous to honeycomb weathering. FINDINGS Self-assembly favors the bacteria at the rim of the droplet, leading to enhanced viability and pathogenesis on the famously known "coffee ring" of the droplet compared to the bacteria present at the center of the droplet residue. Mechanistic insights gained via our study can have far-reaching implications for bacterial infection through droplets, e.g., through open wounds.
Collapse
Affiliation(s)
- Abdur Rasheed
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Omkar Hegde
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
| | - Ritika Chatterjee
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, India
| | | | - Dipshikha Chakravortty
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, India; School of Biology, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India.
| | - Saptarshi Basu
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India.
| |
Collapse
|
25
|
Ashokkumar L, Lavu V, Palraj KK, Rao SR, Balaji SK. Efficacy of chlorhexidine/herbal formulation for microbial reduction in aerosol generated following ultrasonic scaling - A double-blinded randomized controlled trial. J Indian Soc Periodontol 2023; 27:82-86. [PMID: 36873971 PMCID: PMC9979815 DOI: 10.4103/jisp.jisp_478_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 01/24/2022] [Accepted: 02/05/2022] [Indexed: 03/07/2023] Open
Abstract
Background Ultrasonic scaling is a potential source of aerosol contamination in dental clinics. The two primary sources of microbial load in aerosols are from the oral cavity and dental unit water line. Literature evidence suggest that the use of preprocedural mouth rinse reduce the bacterial load in aerosol generated during ultrasonic scaling. Aim The aim of the study is to assess the comparative efficacy of reduction in viable bacteria in the aerosol at patient's chest area, doctor's mask area and two feet beside the patient following use of chlorhexidine/herbal formulation diluted in the water source by a randomized controlled clinical trial. Materials and Methods Forty-five subjects (with chronic gingivitis) were matched for age, gender, and gingival index score. The subjects were randomized and received ultrasonic scaling with distilled water (control)/chlorhexidine (tTest)/herbal formulation (test). Aerosol produced during scaling was collected at patient's chest area, doctor's mask area, two feet beside the patient on blood agar plates, which were incubated at 37°C for 48 h and total colony forming units (CFUs) were counted. Results A significant reduction in the total CFUs' counts was observed at all the three sites sampled in test groups (chlorhexidine group and herbal formulation group) as compared to control (P < 0.01). Conclusion The addition of antiseptic agents to the water source contributed to a significant reduction of the cultivable microbial counts in the aerosol and hence can be used to reduce the risk of cross-infection during ultrasonic scaling.
Collapse
Affiliation(s)
- Lekha Ashokkumar
- Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| | - Vamsi Lavu
- Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| | - Kennedy Kumar Palraj
- Department of Microbiology, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| | - Suresh Ranga Rao
- Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| | - Subbusamy Kanakasabapathy Balaji
- Department of Periodontology, Faculty of Dental Sciences, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| |
Collapse
|
26
|
Zheng Z, Liang C, Li Z, Wu Y, Lin B, Fang J. Mask-Wearing and Handwashing Behaviors of Chinese Rural Residents during the Pandemic of COVID-19: A Cross-Sectional Survey. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:779. [PMID: 36613099 PMCID: PMC9819408 DOI: 10.3390/ijerph20010779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/25/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
OBJECTIVE To understand mask-wearing and handwashing behaviors of Chinese rural residents during the COVID-19 pandemic and to analyze the associated factors. METHODS This study used a multi-stage random sampling method to conduct a cross-sectional questionnaire survey during the period of July to December of 2021, in six counties located in Shandong, Shanxi, and Yunnan provinces representing the eastern, central, and western regions of China, respectively. A total of 3864 villagers were surveyed with a questionnaire, and 3832 valid questionnaires were finally analyzed. Descriptive statistics and logistic regression analysis were used for statistical analysis. RESULTS Around ninety-four percent (93.6%) of rural residents reported mask-wearing during the COVID-19 pandemic, but only 44.5% of them could replace masks in time. Multivariate logistic regression analysis showed that those who were female, aged 15-59, had an education level of high school and above, were divorced/widowed, worked as farmers (workers), or were rural residents in Shandong Province were more likely to wear masks. Furthermore, those who were female, aged 15-59, had an education level of high school and above, were unmarried and married, were business and service workers, or were rural residents in Shandong and Shanxi Province replaced masks more timely. Around seventy percent (69.7%) of rural residents reported using soap when washing their hands, but only 38.0% of rural residents could wash their hands properly. Multivariate logistic regression analysis showed that rural residents who were aged 35-59, had an education of high school and above, or lived in Shandong Province and Shanxi Province were more likely to wash their hands with soap. Those who were aged 15-59, had an education of high school and above, worked as farmers (workers), were employees of governmental departments and retirees, were business and service workers, or were students had higher proper handwashing rates. CONCLUSION During the COVID-19 pandemic, the proportion of Chinese rural residents wearing masks reached 93.6%, but only 44.5% were able to replace masks in time, gender, age, education level, marital status, occupation, and living place had an impact on mask-wearing. The proportion of Chinese rural residents who could wash hands with soap reached 69.7%, but only 38.0% could wash their hands properly. Age and education level were influencing factors for both washing-hand with soap and proper handwashing.
Collapse
|
27
|
Nie Z, Chen Y, Deng M. Quantitative evaluation of precautions against the COVID-19 indoor transmission through human coughing. Sci Rep 2022; 12:22573. [PMID: 36585431 PMCID: PMC9803700 DOI: 10.1038/s41598-022-26837-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 12/21/2022] [Indexed: 12/31/2022] Open
Abstract
In this work, we focus on the dispersion of COVID-19-laden droplets using the transient computational fluid dynamics (CFD) modeling and simulation of the coughing process of virus carriers in an enclosure room, aiming to set up the basic prototype of popular precautionary strategies, i.e., face mask, upward ventilation, protective screen, or any combination thereof, against the indoor transmission of COVID-19 and other highly contagious diseases in the future. A multi-component Eulerian-Lagrangian CFD particle-tracking model with user-defined functions is utilized under 8 cases to examine the characteristics of droplet dispersion concerning the mass and heat transfer, droplet evaporation, air buoyancy, air convection, air-droplet friction, and turbulent dispersion. The result shows that implementing upward ventilation is the most effective measure, followed by wearing face masks. Protective screens can restrict the movement of the coughing droplets (though it will not reduce viral load). However, applying protective screens arranged with lean can be counterproductive in preventing the spread of COVID-19 when it is inappropriately placed with ventilation. The soundest solution is the combination of the face mask and upward ventilation, which can reduce the indoor infectious concentration by nearly 99.95% compared with the baseline without any precautionary strategies. With the resumption of school and work in the post-epidemic era, this study would provide intelligence-enhancing advice for the masses and rule-makers to curb the pandemic.
Collapse
Affiliation(s)
- Zhenguo Nie
- grid.12527.330000 0001 0662 3178Department of Mechanical Engineering, Tsinghua University, Beijing, 100084 China ,State Key Laboratory of Tribology in Advanced Equipment, Beijing, 100084 China ,Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Beijing, 100084 China
| | - Yunzhi Chen
- grid.12527.330000 0001 0662 3178Department of Mechanical Engineering, Tsinghua University, Beijing, 100084 China ,grid.440686.80000 0001 0543 8253Marine Engineering College, Dalian Maritime University, Dalian, 116026 Liaoning China
| | - Meifeng Deng
- grid.9227.e0000000119573309State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 China ,grid.410726.60000 0004 1797 8419University of Chinese Academy of Sciences, Beijing, 100049 China
| |
Collapse
|
28
|
Wang B, Yang D, Chang Z, Zhang R, Dai J, Fang Y. Wearable bioelectronic masks for wireless detection of respiratory infectious diseases by gaseous media. MATTER 2022; 5:4347-4362. [PMID: 36157685 PMCID: PMC9484046 DOI: 10.1016/j.matt.2022.08.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/07/2022] [Accepted: 08/16/2022] [Indexed: 05/17/2023]
Abstract
Respiratory infectious diseases (H1N1, H5N1, COVID-19, etc.) are pandemics that can continually spread in the air through micro-droplets or aerosols. However, the detection of samples in gaseous media is hampered by the requirement for trace amounts and low concentrations. Here, we develop a wearable bioelectronic mask device integrated with ion-gated transistors. Based on the sensitive gating effect of ion gels, our aptamer-functionalized transistors can measure trace-level liquid samples (0.3 μL) and even gaseous media samples at an ultra-low concentration (0.1 fg/mL). The ion-gated transistor with multi-channel analysis can respond to multiple targets simultaneously within as fast as 10 min, especially without sample pretreatment. Integrating a wireless internet of things system enables the wearable mask to achieve real-time and on-site detection of the surrounding air, providing an alert before infection. The wearable bioelectronic masks hold promise to serve as an early warning system to prevent outbreaks of respiratory infectious diseases.
Collapse
Affiliation(s)
- Bingfang Wang
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
| | - Deqi Yang
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
| | - Zhiqiang Chang
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
| | - Ru Zhang
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital affiliated to Tongji University, Shanghai 200120, China
| | - Jing Dai
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
| | - Yin Fang
- Research Center for Translational Medicine, Shanghai East Hospital affiliated to Tongji University, The Institute for Biomedical Engineering & Nano Science, Tongji University School of Medicine, Shanghai 200120, China
- Key Laboratory of Arrhythmias of the Ministry of Education of China, Shanghai East Hospital affiliated to Tongji University, Shanghai 200120, China
| |
Collapse
|
29
|
Joseph J, Baby HM, Zhao S, Li X, Cheung K, Swain K, Agus E, Ranganathan S, Gao J, Luo JN, Joshi N. Role of bioaerosol in virus transmission and material-based countermeasures. EXPLORATION (BEIJING, CHINA) 2022; 2:20210038. [PMID: 37324804 PMCID: PMC10190935 DOI: 10.1002/exp.20210038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 04/15/2022] [Indexed: 06/17/2023]
Abstract
Respiratory pathogens transmit primarily through particles such as droplets and aerosols. Although often overlooked, the resuspension of settled droplets is also a key facilitator of disease transmission. In this review, we discuss the three main mechanisms of aerosol generation: direct generation such as coughing and sneezing, indirect generation such as medical procedures, and resuspension of settled droplets and aerosols. The size of particles and environmental factors influence their airborne lifetime and ability to cause infection. Specifically, humidity and temperature are key factors controlling the evaporation of suspended droplets, consequently affecting the duration in which particles remain airborne. We also suggest material-based approaches for effective prevention of disease transmission. These approaches include electrostatically charged virucidal agents and surface coatings, which have been shown to be highly effective in deactivating and reducing resuspension of pathogen-laden aerosols.
Collapse
Affiliation(s)
- John Joseph
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
- Harvard Medical SchoolBostonMassachusettsUSA
| | - Helna Mary Baby
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Spencer Zhao
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Xiang‐Ling Li
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Krisco‐Cheuk Cheung
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Kabir Swain
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Eli Agus
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Sruthi Ranganathan
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
| | - Jingjing Gao
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
- Harvard Medical SchoolBostonMassachusettsUSA
| | - James N Luo
- Harvard Medical SchoolBostonMassachusettsUSA
- Department of SurgeryBrigham and Women's HospitalBostonMassachusettsUSA
| | - Nitin Joshi
- Center for Nanomedicine, Department of AnesthesiologyPerioperative and Pain Medicine, Brigham and Women's HospitalBostonMassachusettsUSA
- Harvard Medical SchoolBostonMassachusettsUSA
| |
Collapse
|
30
|
Argyropoulos CD, Skoulou V, Efthimiou G, Michopoulos AK. Airborne transmission of biological agents within the indoor built environment: a multidisciplinary review. AIR QUALITY, ATMOSPHERE, & HEALTH 2022; 16:477-533. [PMID: 36467894 PMCID: PMC9703444 DOI: 10.1007/s11869-022-01286-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 11/17/2022] [Indexed: 06/17/2023]
Abstract
The nature and airborne dispersion of the underestimated biological agents, monitoring, analysis and transmission among the human occupants into building environment is a major challenge of today. Those agents play a crucial role in ensuring comfortable, healthy and risk-free conditions into indoor working and leaving spaces. It is known that ventilation systems influence strongly the transmission of indoor air pollutants, with scarce information although to have been reported for biological agents until 2019. The biological agents' source release and the trajectory of airborne transmission are both important in terms of optimising the design of the heating, ventilation and air conditioning systems of the future. In addition, modelling via computational fluid dynamics (CFD) will become a more valuable tool in foreseeing risks and tackle hazards when pollutants and biological agents released into closed spaces. Promising results on the prediction of their dispersion routes and concentration levels, as well as the selection of the appropriate ventilation strategy, provide crucial information on risk minimisation of the airborne transmission among humans. Under this context, the present multidisciplinary review considers four interrelated aspects of the dispersion of biological agents in closed spaces, (a) the nature and airborne transmission route of the examined agents, (b) the biological origin and health effects of the major microbial pathogens on the human respiratory system, (c) the role of heating, ventilation and air-conditioning systems in the airborne transmission and (d) the associated computer modelling approaches. This adopted methodology allows the discussion of the existing findings, on-going research, identification of the main research gaps and future directions from a multidisciplinary point of view which will be helpful for substantial innovations in the field.
Collapse
Affiliation(s)
| | - Vasiliki Skoulou
- B3 Challenge Group, Chemical Engineering, School of Engineering, University of Hull, Cottingham Road, Hull, HU6 7RX UK
| | - Georgios Efthimiou
- Centre for Biomedicine, Hull York Medical School, University of Hull, Cottingham Road, Hull, HU6 7RX UK
| | - Apostolos K. Michopoulos
- Energy & Environmental Design of Buildings Research Laboratory, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| |
Collapse
|
31
|
Ibrahim F, Samsudin EZ, Ishak AR, Sathasivam J. Hospital indoor air quality and its relationships with building design, building operation, and occupant-related factors: A mini-review. Front Public Health 2022; 10:1067764. [PMID: 36424957 PMCID: PMC9679624 DOI: 10.3389/fpubh.2022.1067764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 10/25/2022] [Indexed: 11/11/2022] Open
Abstract
Indoor air quality (IAQ) has recently gained substantial traction as the airborne transmission of infectious respiratory disease becomes an increasing public health concern. Hospital indoor environments are complex ecosystems and strategies to improve hospital IAQ require greater appreciation of its potentially modifiable determinants, evidence of which are currently limited. This mini-review updates and integrates findings of previous literature to outline the current scientific evidence on the relationship between hospital IAQ and building design, building operation, and occupant-related factors. Emerging evidence has linked aspects of building design (dimensional, ventilation, and building envelope designs, construction and finishing materials, furnishing), building operation (ventilation operation and maintenance, hygiene maintenance, access control for hospital users), and occupants' characteristics (occupant activities, medical activities, adaptive behavior) to hospital IAQ. Despite the growing pool of IAQ literature, some important areas within hospitals (outpatient departments) and several key IAQ elements (dimensional aspects, room configurations, building materials, ventilation practices, adaptive behavior) remain understudied. Ventilation for hospitals continues to be challenging, as elevated levels of carbon monoxide, bioaerosols, and chemical compounds persist in indoor air despite having mechanical ventilation systems in place. To curb this public health issue, policy makers should champion implementing hospital IAQ surveillance system for all areas of the hospital building, applying interdisciplinary knowledge during the hospital design, construction and operation phase, and training of hospital staff with regards to operation, maintenance, and building control manipulation. Multipronged strategies targeting these important determinants are believed to be a viable strategy for the future control and improvement of hospital IAQ.
Collapse
Affiliation(s)
- Farha Ibrahim
- Department of Public Health Medicine, Faculty of Medicine, Universiti Teknologi MARA, Selangor, Malaysia
- Training Management Division, Ministry of Health, Johor Bahru, Malaysia
| | - Ely Zarina Samsudin
- Department of Public Health Medicine, Faculty of Medicine, Universiti Teknologi MARA, Selangor, Malaysia
| | - Ahmad Razali Ishak
- Centre for Environmental Health and Safety, Faculty of Health Sciences, Universiti Teknologi MARA, Selangor, Malaysia
| | - Jeyanthini Sathasivam
- Public Health Division, Johor Health State Department, Ministry of Health, Johor Bahru, Malaysia
| |
Collapse
|
32
|
Pulmonary Delivery of Favipiravir in Rats Reaches High Local Concentrations without Causing Oxidative Lung Injury or Systemic Side Effects. Pharmaceutics 2022; 14:pharmaceutics14112375. [DOI: 10.3390/pharmaceutics14112375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022] Open
Abstract
Favipiravir displays a rapid viral clearance, a high recovery rate and broad therapeutic safety; however, its oral administration was associated with systemic side effects in susceptible patients. Considering that the pulmonary route could provide a high drug concentration, and a safer application with less absorption into systemic circulation, it was aimed to elucidate whether favipiravir delivered via soft-mist inhaler has any deleterious effects on lung, liver and kidney tissues of healthy rats. Wistar albino rats of both sexes (n = 72) were placed in restrainers, and were given either saline or favipiravir (1, 2.5, 5 or 10 mg/kg in 1 mL saline) by inhalation within 2 min for 5 consecutive days. On the 6th day, electrocardiographic recording was obtained, and cardiac blood and lung tissues were collected. Favipiravir did not alter cardiac rhythm, blood cell counts, serum levels of alanine transaminase, aspartate transaminase, blood urea nitrogen, creatinine, urea or uric acid, and did not cause any significant changes in the pulmonary malondialdehyde, myeloperoxidase activity or antioxidant glutathione levels. Our data revealed that pulmonary use of favipiravir via soft-mist inhaler enables a high local concentration compared to plasma without oxidative lung injury or cardiac or hepatorenal dysfunction.
Collapse
|
33
|
Ogunjo S, Olusola A, Orimoloye I. Association Between Weather Parameters and SARS-CoV-2 Confirmed Cases in Two South African Cities. GEOHEALTH 2022; 6:e2021GH000520. [PMID: 36348988 PMCID: PMC9635841 DOI: 10.1029/2021gh000520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 04/10/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Several approaches have been used in the race against time to mitigate the spread and impact of COVID-19. In this study, we investigated the role of temperature, relative humidity, and particulate matter in the spread of COVID-19 cases within two densely populated cities of South Africa-Pretoria and Cape Town. The role of different levels of COVID-19 restrictions in the air pollution levels, obtained from the Purple Air Network, of the two cities were also considered. Our results suggest that 26.73% and 43.66% reduction in PM2.5 levels were observed in Cape Town and Pretoria respectively for no lockdown (Level 0) to the strictest lockdown level (Level 5). Furthermore, our results showed a significant relationship between particulate matter and COVID-19 in the two cities. Particulate matter was found to be a good predictor, based on the significance of causality test, of COVID-19 cases in Pretoria with a lag of 7 days and more. This suggests that the effect of particulate matter on the number of cases can be felt after 7 days and beyond in Pretoria.
Collapse
Affiliation(s)
- Samuel Ogunjo
- Department of PhysicsFederal University of TechnologyAkureNigeria
| | - Adeyemi Olusola
- Faculty of Environmental and Urban ChangeYork UniversityTorontoCanada
- Department of GeographyUniversity of the Free StateBloemfonteinSouth Africa
| | - Israel Orimoloye
- Department of Geography, Faculty of Food and AgricultureThe University of the West Indies, St. Augustine CampusSt. AugustineTrinidad and Tobago
| |
Collapse
|
34
|
Zhao Y, Feng Y, Ma L. Impacts of human movement and ventilation mode on the indoor environment, droplet evaporation, and aerosol transmission risk at airport terminals. BUILDING AND ENVIRONMENT 2022; 224:109527. [PMID: 36060217 PMCID: PMC9428122 DOI: 10.1016/j.buildenv.2022.109527] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/16/2022] [Accepted: 08/20/2022] [Indexed: 05/29/2023]
Abstract
The dispersion of the coronavirus pandemic has caused immense damage worldwide, and people have begun to ruminate epidemic prevention strategies for public places. Airport terminals with a high number of occupied passengers have become potentially high-risk regions for aerosol transmission of coronavirus disease 2019 (COVID-19). In this study, the Eulerian-Lagrangian approach and realizable k-ε turbulence model were used to numerically simulate airflow organization and aerosol transmission when passengers are moving slowly in a line. During the aerosol transmission period, evaporation was considered a key factor influencing the particle size distribution at the beginning of aerosol transmission from humans. Moreover, passenger movement at the airport terminal was attained by employing dynamic mesh algorithms. Based on the relative direction of passengers and air vents when queuing in the terminal building, we studied three conditions: windward walking, leeward walking, and crosswind walking. The results of this study showed that the walking has an important influence on droplet distribution. Droplet distribution indicates that individuals standing behind patients during queuing movements have a higher risk of infection than those standing in front of them. A significant aerosol accumulation was discovered at 0.5 m behind the patient when passengers moved simultaneously. An aerosol transmission distance of 15 s aligned with the passenger's walking direction could reach up to 9.32 m. Furthermore, although the evaporation time of the large droplets was longer than that of the small droplets, both large and small droplets evaporated rapidly after exhalation. The crosswind influence caused the droplets to travel farther away in a direction perpendicular to human movement, which increased the distance by approximately 1.26 m compared to the absence of the crosswind influence.
Collapse
Affiliation(s)
- Yu Zhao
- School of Civil Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, 2 Linggong Road, Ganjingzi District, Dalian, 116024, China
| | - Yao Feng
- School of Civil Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, 2 Linggong Road, Ganjingzi District, Dalian, 116024, China
| | - Liangdong Ma
- School of Civil Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, 2 Linggong Road, Ganjingzi District, Dalian, 116024, China
| |
Collapse
|
35
|
Zheng J, Tao Q, Chen Y. Airborne infection risk of inter-unit dispersion through semi-shaded openings: A case study of a multi-storey building with external louvers. BUILDING AND ENVIRONMENT 2022; 225:109586. [PMID: 36105610 PMCID: PMC9461617 DOI: 10.1016/j.buildenv.2022.109586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/17/2022] [Accepted: 09/05/2022] [Indexed: 06/15/2023]
Abstract
Building design for natural ventilation and indoor air quality have become increasingly important during the past decades. Investigating airflow routes of airborne transmission and evaluating the potential infection risk in the multi-storey building is helpful to the reduction of airborne transmission. Therefore, this study applies computational fluid dynamics simulations to investigate the inter-unit dispersion pattern of gaseous pollutant between different units through semi-shaded openings. The airflow exchange and pollutant dispersion in a multi-storey building is driven by wind-induced natural ventilation. External shading louvers, which are widely used in building facades to reduce heat gain from solar radiation, are chosen to establish the semi-shaded environment. Experimental validation is performed to make sure the accuracy of numerical settings in airflow investigation of semi-shaded openings. The airflow characteristics around semi-shaded openings is analyzed in the numerical simulations. The re-entry ratio of tracer gas and the airborne infection risk of COVID-19 is investigated in the cases with different louvers' locations and source units. The results show that the airflow is commonly slower in the semi-shaded space between louvers and openings. But the ventilation rate is not always consistent with the airflow speed because of the diversion effect from louver slats. The inter-unit infectious risk in the worst unit rises from 7.82% to 26.17% for windward shading, while it rises from 7.89% to 22.52% for leeward shading. These results are helpful to the further understanding of inter-unit transmission of infectious respiratory aerosols through external openings with complex structures.
Collapse
Affiliation(s)
- Jianwen Zheng
- College of Mechanical and Energy Engineering, Jimei University, Xiamen, 361021, China
| | - Qiuhua Tao
- College of Mechanical and Energy Engineering, Jimei University, Xiamen, 361021, China
- Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen, 361021, China
| | - Yangui Chen
- College of Mechanical and Energy Engineering, Jimei University, Xiamen, 361021, China
- Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, Xiamen, 361021, China
| |
Collapse
|
36
|
Siebler L, Calandri M, Rathje T, Stergiaropoulos K. Experimental Methods of Investigating Airborne Indoor Virus-Transmissions Adapted to Several Ventilation Measures. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:11300. [PMID: 36141572 PMCID: PMC9517214 DOI: 10.3390/ijerph191811300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 08/31/2022] [Accepted: 09/03/2022] [Indexed: 06/16/2023]
Abstract
This study introduces a principle that unifies two experimental methods for evaluating airborne indoor virus-transmissions adapted to several ventilation measures. A first-time comparison of mechanical/natural ventilation and air purification with regard to infection risks is enabled. Effortful computational fluid dynamics demand detailed boundary conditions for accurate calculations of indoor airflows, which are often unknown. Hence, a suitable, simple and generalized experimental set up for identifying the spatial and temporal infection risk for different ventilation measures is more qualified even with unknown boundary conditions. A trace gas method is suitable for mechanical and natural ventilation with outdoor air exchange. For an accurate assessment of air purifiers based on filtration, a surrogate particle method is appropriate. The release of a controlled rate of either trace gas or particles simulates an infectious person releasing virus material. Surrounding substance concentration measurements identify the neighborhood exposure. One key aspect of the study is to prove that the requirement of concordant results of both methods is fulfilled. This is the only way to ensure that the comparison of different ventilation measures described above is reliable. Two examples (a two-person office and a classroom) show how practical both methods are and how the principle is applicable for different types and sizes of rooms.
Collapse
|
37
|
Alkhateeb N, Almubarak R, Aldurayb S, Alanazi M, Alsuliman F, Aljabr R, Gardner MR. Evaluation of expelled droplets through traditional Islamic face coverings. Ann Saudi Med 2022; 42:299-304. [PMID: 36252143 PMCID: PMC9557785 DOI: 10.5144/0256-4947.2022.299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 04/24/2022] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Expelled droplet count is an important factor when investigating the efficacy of face coverings since higher droplet counts indicate an increased possibility of disease transmission for airborne viruses such as COVID-19. While there is some published work relating facemask style to expelled droplet count during speech, there is no published data regarding the effectiveness of traditional Islamic face coverings such as the ghutra and niqab commonly worn by men and women in the Arabian Peninsula. OBJECTIVES Measure the effectiveness of worn traditional Islamic face coverings in reducing expelled droplet count during speech. DESIGN Experimental study SETTING: Biomedical engineering department at a university in Saudi Arabia. MATERIALS AND METHODS Using a previously described low-cost method for quantifying expelled droplets, this study compares droplet counts through commonly worn traditional Islamic face coverings and conventional three-ply surgical masks worn during speech. The device records scattered light from droplets (>5 μm diameter) as they pass through a laser light sheet (520 nm), and then video processing yields droplet counts. MAIN OUTCOME MEASURES Percent reduction in the number of expelled droplets passing through face coverings during speech compared to no face covering MAIN OUTCOME MEASURES: 9-15 recorded samples per face covering (n=3) plus no face covering control (n=1) in three females. RESULTS The average percent reduction for each mask type compared to no mask trial was 76% for the cotton ghutra, 93% for the niqab, and 95% for the surgical mask. The niqab and ghutra had relatively high variability in droplet reduction. CONCLUSIONS Traditional Islamic face coverings block some expelled droplets, but at lower rates than surgical masks. High standard deviations within facemask groups with high variability in fit (i.e., the cotton ghutra) further denote the importance of fit in face covering effectiveness. Some protection from airborne viruses is likely with traditional Islamic face coverings compared to no mask, but the amount of protection depends on the fit of the face covering. LIMITATIONS Detectable droplets limited to particles greater than 5 μm diameter with forward expulsion direction. CONFLICT OF INTEREST None.
Collapse
Affiliation(s)
- Norah Alkhateeb
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Reem Almubarak
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Shatha Aldurayb
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Mashael Alanazi
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Fai Alsuliman
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Reem Aljabr
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| | - Michael R. Gardner
- From the Department of Biomedical Engineering, King Faisal University, Al Ahsa, Saudi Arabia
| |
Collapse
|
38
|
Issakhov A, Omarova P, Borsikbayeva A. Assessment of airborne transmission from coughing processes with thermal plume adjacent to body and radiators on effectiveness of social distancing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:66808-66840. [PMID: 35508854 DOI: 10.1007/s11356-022-18713-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
The new coronavirus disease COVID-19 has caused a worldwide pandemic to be declared in a very short period of time. The complexity of the infection lies in asymptomatic carriers that can inadvertently transmit the virus through airborne droplets. This kind of viral disease can infect the human body with tiny particles that carry various bacteria that are generated by the respiratory system of infected patients. In this study, numerical results are proposed that demonstrate the effect of human body temperature and temperature from radiators in a room on the spread of the smallest droplets and particles in an enclosed space. The numerical model proposed in this work takes into account the sedimentation of particles and droplets under the action of gravitational sedimentation and transport in a closed room during the processes of breathing, sneezing or coughing. Various cases were considered, taking into account normal human breathing, coughing or sneezing, as well as three different values of the rate of emission of particles from the human mouth. The heat plume, which affects the concentration of particles in the breathing zone, spreads the particle up to a distance of 4.29 m in the direction of the air flow. It can also be seen from the results obtained that the presence of radiators strongly affects the propagation of particles of various sizes in a closed room. From the obtained results, it should be noted that in order to recommend the optimal social distance, it is necessary to take into account many factors, especially momentum, gravity, human body temperature, as well as the process of natural convection, which greatly affect the propagation of particles in a closed room. The conclusions drawn from the results of this work show that, given the environmental conditions, the social distance of 2 m may not be enough.
Collapse
Affiliation(s)
- Alibek Issakhov
- Al-Farabi, Kazakh National University, Almaty, Republic of Kazakhstan.
- Kazakh British Technical University, Almaty, Republic of Kazakhstan.
- International Information Technology University, Almaty, Republic of Kazakhstan.
| | - Perizat Omarova
- Al-Farabi, Kazakh National University, Almaty, Republic of Kazakhstan
| | | |
Collapse
|
39
|
Alexander RW, Tian J, Haddrell AE, Oswin HP, Neal E, Hardy DA, Otero-Fernandez M, Mann JFS, Cogan TA, Finn A, Davidson AD, Hill DJ, Reid JP. Mucin Transiently Sustains Coronavirus Infectivity through Heterogenous Changes in Phase Morphology of Evaporating Aerosol. Viruses 2022; 14:1856. [PMID: 36146663 PMCID: PMC9503081 DOI: 10.3390/v14091856] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 08/18/2022] [Accepted: 08/20/2022] [Indexed: 11/16/2022] Open
Abstract
Respiratory pathogens can be spread though the transmission of aerosolised expiratory secretions in the form of droplets or particulates. Understanding the fundamental aerosol parameters that govern how such pathogens survive whilst airborne is essential to understanding and developing methods of restricting their dissemination. Pathogen viability measurements made using Controlled Electrodynamic Levitation and Extraction of Bioaerosol onto Substrate (CELEBS) in tandem with a comparative kinetics electrodynamic balance (CKEDB) measurements allow for a direct comparison between viral viability and evaporation kinetics of the aerosol with a time resolution of seconds. Here, we report the airborne survival of mouse hepatitis virus (MHV) and determine a comparable loss of infectivity in the aerosol phase to our previous observations of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Through the addition of clinically relevant concentrations of mucin to the bioaerosol, there is a transient mitigation of the loss of viral infectivity at 40% RH. Increased concentrations of mucin promoted heterogenous phase change during aerosol evaporation, characterised as the formation of inclusions within the host droplet. This research demonstrates the role of mucus in the aerosol phase and its influence on short-term airborne viral stability.
Collapse
Affiliation(s)
- Robert W. Alexander
- School of Cellular and Molecular Medicine, University of Bristol, Bristol BS8 1TD, UK
| | - Jianghan Tian
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Allen E. Haddrell
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Henry P. Oswin
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Edward Neal
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Daniel A. Hardy
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Mara Otero-Fernandez
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| | - Jamie F. S. Mann
- Bristol Veterinary School, University of Bristol, Langford House, Langford, Bristol BS40 5DU, UK
| | - Tristan A. Cogan
- Bristol Veterinary School, University of Bristol, Langford House, Langford, Bristol BS40 5DU, UK
| | - Adam Finn
- School of Cellular and Molecular Medicine, University of Bristol, Bristol BS8 1TD, UK
| | - Andrew D. Davidson
- School of Cellular and Molecular Medicine, University of Bristol, Bristol BS8 1TD, UK
| | - Darryl J. Hill
- School of Cellular and Molecular Medicine, University of Bristol, Bristol BS8 1TD, UK
| | - Jonathan P. Reid
- School of Chemistry, Cantock’s Close, University of Bristol, Bristol BS8 1TS, UK
| |
Collapse
|
40
|
Sung YJ, Song S, Sim SJ. A Rapid and High-Throughput Assay for Light Scattering of SARS-CoV-2 Virion-Sized Particulates via Microfluidic Spray Device Reveals the Protection Performance of Face Masks against Virus Infection. NANO LETTERS 2022; 22:6744-6752. [PMID: 35930264 DOI: 10.1021/acs.nanolett.2c02278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To prevent interhuman transmission of viruses, new mask types─claiming improved filtration─require careful performance characterization. Here, a microfluidic spray device that can effectively simulate droplets emitted during coughing or sneezing was developed to spray droplets containing gold nanoparticles (AuNPs) that mimic SARS-CoV-2 to overcome the shortcomings associated with using biosamples. The light scattered by the AuNPs passing through the mask is successfully analyzed by using an automated scattering light mapping system within a duration of 2 min, thereby enabling high-throughput analysis of the filtering efficiency of various types of commercial masks. The differences in efficiency in terms of same mask type from different manufacturers, double masking, and prolonged usage, which are challenging to analyze with conventional testing systems, can also be assessed. AuNP-mediated mask performance evaluation enables the rapid determination of mask efficiency according to particle size and can contribute to the rapid response to counter new emerging infectious biohazards.
Collapse
Affiliation(s)
- Young Joon Sung
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sojin Song
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Sang Jun Sim
- Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| |
Collapse
|
41
|
Prediction of respiratory droplets evolution for safer academic facilities planning amid COVID-19 and future pandemics: A numerical approach. JOURNAL OF BUILDING ENGINEERING 2022; 54:104593. [PMCID: PMC9107331 DOI: 10.1016/j.jobe.2022.104593] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 04/06/2022] [Accepted: 04/27/2022] [Indexed: 05/29/2023]
Abstract
Airborne dispersion of the novel SARS-CoV-2 through the droplets produced during expiratory activities is one of the main transmission mechanisms of this virus from one person to another. Understanding how these droplets spread when infected humans with COVID-19 or other airborne infectious diseases breathe, cough or sneeze is essential for improving prevention strategies in academic facilities. This work aims to assess the transport and fate of droplets in indoor environments using Computational Fluid Dynamics (CFD). This study employs unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations with the Euler-Lagrange approach to visualize the location of thousands of droplets released in a respiratory event and their size evolution. Furthermore, we assess the dispersion of coughing, sneezing, and breathing saliva droplets from an infected source in a classroom with air conditioning and multiple occupants. The results indicate that the suggested social distancing protocol is not enough to avoid the transmission of COVID-19 since small saliva droplets ( ≤ 12 μm) can travel in the streamwise direction up to 4 m when an infected person coughs and more than 7 m when sneezes. These droplets can reach those distances even when there is no airflow from the wind or ventilation systems. The number of airborne droplets in locations close to the respiratory system of a healthy person increases when the relative humidity of the indoor environment is low. This work sets an accurate, rapid, and validated numerical framework reproducible for various indoor environments integrating qualitative and quantitative data analysis of the droplet size evolution of respiratory events for a safer design of physical distancing standards and air cleaning technologies.
Collapse
|
42
|
Habte S, Debella A, Abdeta T, Birhanu A, Balis B, Eshetu B, Bekele H. Food handler's level of COVID-19 prevention practice and preparedness of food and drinking establishments to combat the pandemic in Eastern Ethiopia. Front Public Health 2022; 10:912077. [PMID: 36052003 PMCID: PMC9426340 DOI: 10.3389/fpubh.2022.912077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 07/11/2022] [Indexed: 01/22/2023] Open
Abstract
Background Food and drinking establishments are potential hotspots for the spread of coronavirus. Food handler's have a higher risk of contracting the disease and transmitting it to others. The aim of this study was to assess the food handler's level of preventive practices toward COVID-19 and the preparedness of food and drinking establishments to tackle the pandemic in Eastern Ethiopia. Methods The cross-sectional study design was conducted from September 1 to 30, 2020. A stratified sampling technique was used to select 276 licensed public food and drinking establishments and a simple random sampling technique was employed to select 422 food handlers from the selected establishments. A face-to-face interview and checklist-based observation were used to collect data. The collected data were entered into Epidata 3.1 and exported to STATA version 16 for analysis. Binary logistic regression analysis were conducted to identify factors associated with COVID-19 preventive practice. Statistical significance was declared at p < 0.05. Results About 406 food handler's participated in this study, making the response rate 96.2%. The study showed that 38.4% of study participants (95% CI: 33.5, 43.1) had good preventive practices for COVID-19. Only 10.5% of food and drinking establishments fulfilled all requirements to prevent COVID-19 transmission. Being male [AOR = 0.61, 95% CI(0.61, (0.39, 0.93)], attending secondary education [AOR = 2.20, (95% CI: 1.37, 3.53)], having a favorable attitude toward COVID-19 [AOR = 1.89, (95% CI: 1.22, 2.95)], and having good knowledge about COVID-19 [AOR = 1.78, (95% CI: 1.13, 2.81)] were significantly associated with the level of COVID-19 preventive practices. Conclusion The level of good COVID-19 preventive practice was found to be low among the food handler's. Only one in ten food and drink establishments fulfilled the national guideline for preventing COVID-19 transmission. Being male, attending secondary education, having knowledge about COVID-19, and having a favorable attitude toward COVID-19 were significantly associated with good COVID-19 preventive practices. A vibrant guideline on prevention practices should be in place at all establishments, and compliance should be monitored. Local health office experts should take comprehensive measures to make all food and drinking establishments accountable for practicing all preventive measures.
Collapse
Affiliation(s)
- Sisay Habte
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Adera Debella
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Tilahun Abdeta
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Abdi Birhanu
- School of Medicine, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Bikila Balis
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Bajrond Eshetu
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| | - Habtamu Bekele
- School of Nursing and Midwifery, College of Health and Medical Sciences, Haramaya University, Harar, Ethiopia
| |
Collapse
|
43
|
Multi-objective performance assessment of HVAC systems and physical barriers on COVID-19 infection transmission in a high-speed train. JOURNAL OF BUILDING ENGINEERING 2022; 53:104544. [PMCID: PMC9022448 DOI: 10.1016/j.jobe.2022.104544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 04/11/2022] [Accepted: 04/17/2022] [Indexed: 06/16/2023]
Abstract
A computational fluid dynamics (CFD) simulation was performed to model and study the transmission risk associated with cough-related SARS-CoV-2 droplets in a real-world high-speed train (HST). In this study, the evaporating of the droplets was considered. Simulation data were post-processed to assess the fraction of the particles deposited on each passenger's face and body, suspended in air, and escaped from exhausts. Firstly, the effects of temperature, relative humidity, ventilation rate, injection source, exhausts' location and capacity, and adding the physical barriers on evaporation and transport of respiratory droplets are investigated in long distance HST. The results demonstrate that overall, 6–43% of the particles were suspended in the cabin after 2.7 min, depending on conditions, and 3–58% of the particles were removed from the cabin in the same duration. Use of physical barriers and high ventilation rate is therefore recommended for both personal and social protection. We found more exhaust capacity and medium relative humidity to be effective in reducing the particles' transmission potential across all studied scenarios. The results indicate that reducing ventilation rate and exhaust capacity, increased aerosols shelf time and dispersion throughout the cabin.
Collapse
|
44
|
Kanankege KST, Graham K, Corzo CA, VanderWaal K, Perez AM, Durr PA. Adapting an Atmospheric Dispersion Model to Assess the Risk of Windborne Transmission of Porcine Reproductive and Respiratory Syndrome Virus between Swine Farms. Viruses 2022; 14:v14081658. [PMID: 36016281 PMCID: PMC9416339 DOI: 10.3390/v14081658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/18/2022] [Accepted: 07/22/2022] [Indexed: 11/16/2022] Open
Abstract
Modeling the windborne transmission of aerosolized pathogens is challenging. We adapted an atmospheric dispersion model (ADM) to simulate the windborne dispersion of porcine reproductive and respiratory syndrome virus (PRRSv) between swine farms. This work focuses on determining ADM applicable parameter values for PRRSv through a literature and expert opinion-based approach. The parameters included epidemiological features of PRRSv, characteristics of the aerosolized particles, and survival of aerosolized virus in relation to key meteorological features. A case study was undertaken to perform a sensitivity analysis on key parameters. Farms experiencing ongoing PRRSv outbreaks were assigned as particle emitting sources. The wind data from the North American Mesoscale Forecast System was used to simulate dispersion. The risk was estimated semi-quantitatively based on the median daily deposition of particles and the distance to the closest emitting farm. Among the parameters tested, the ADM was most sensitive to the number of particles emitted, followed by the model runtime, and the release height was the least sensitive. Farms within 25 km from an emitting farm were at the highest risk; with 53.66% being within 10 km. An ADM-based risk estimation of windborne transmission of PRRSv may inform optimum time intervals for air sampling, plan preventive measures, and aid in ruling out the windborne dispersion in outbreak investigations.
Collapse
Affiliation(s)
- Kaushi S. T. Kanankege
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA; (C.A.C.); (K.V.); (A.M.P.)
- Correspondence: ; Tel.: +1-(612)-625-7755; Fax: +1-(612)-625-6241
| | - Kerryne Graham
- Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australian Centre for Disease Preparedness, Geelong, VIC 3219, Australia; (K.G.); (P.A.D.)
| | - Cesar A. Corzo
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA; (C.A.C.); (K.V.); (A.M.P.)
| | - Kimberly VanderWaal
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA; (C.A.C.); (K.V.); (A.M.P.)
| | - Andres M. Perez
- Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St Paul, MN 55108, USA; (C.A.C.); (K.V.); (A.M.P.)
| | - Peter A. Durr
- Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australian Centre for Disease Preparedness, Geelong, VIC 3219, Australia; (K.G.); (P.A.D.)
| |
Collapse
|
45
|
Katiyar SK, Gaur SN, Solanki RN, Sarangdhar N, Suri JC, Kumar R, Khilnani GC, Chaudhary D, Singla R, Koul PA, Mahashur AA, Ghoshal AG, Behera D, Christopher DJ, Talwar D, Ganguly D, Paramesh H, Gupta KB, Kumar T M, Motiani PD, Shankar PS, Chawla R, Guleria R, Jindal SK, Luhadia SK, Arora VK, Vijayan VK, Faye A, Jindal A, Murar AK, Jaiswal A, M A, Janmeja AK, Prajapat B, Ravindran C, Bhattacharyya D, D'Souza G, Sehgal IS, Samaria JK, Sarma J, Singh L, Sen MK, Bainara MK, Gupta M, Awad NT, Mishra N, Shah NN, Jain N, Mohapatra PR, Mrigpuri P, Tiwari P, Narasimhan R, Kumar RV, Prasad R, Swarnakar R, Chawla RK, Kumar R, Chakrabarti S, Katiyar S, Mittal S, Spalgais S, Saha S, Kant S, Singh VK, Hadda V, Kumar V, Singh V, Chopra V, B V. Indian Guidelines on Nebulization Therapy. Indian J Tuberc 2022; 69 Suppl 1:S1-S191. [PMID: 36372542 DOI: 10.1016/j.ijtb.2022.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/03/2022] [Accepted: 06/09/2022] [Indexed: 06/16/2023]
Abstract
Inhalational therapy, today, happens to be the mainstay of treatment in obstructive airway diseases (OADs), such as asthma, chronic obstructive pulmonary disease (COPD), and is also in the present, used in a variety of other pulmonary and even non-pulmonary disorders. Hand-held inhalation devices may often be difficult to use, particularly for children, elderly, debilitated or distressed patients. Nebulization therapy emerges as a good option in these cases besides being useful in the home care, emergency room and critical care settings. With so many advancements taking place in nebulizer technology; availability of a plethora of drug formulations for its use, and the widening scope of this therapy; medical practitioners, respiratory therapists, and other health care personnel face the challenge of choosing appropriate inhalation devices and drug formulations, besides their rational application and use in different clinical situations. Adequate maintenance of nebulizer equipment including their disinfection and storage are the other relevant issues requiring guidance. Injudicious and improper use of nebulizers and their poor maintenance can sometimes lead to serious health hazards, nosocomial infections, transmission of infection, and other adverse outcomes. Thus, it is imperative to have a proper national guideline on nebulization practices to bridge the knowledge gaps amongst various health care personnel involved in this practice. It will also serve as an educational and scientific resource for healthcare professionals, as well as promote future research by identifying neglected and ignored areas in this field. Such comprehensive guidelines on this subject have not been available in the country and the only available proper international guidelines were released in 1997 which have not been updated for a noticeably long period of over two decades, though many changes and advancements have taken place in this technology in the recent past. Much of nebulization practices in the present may not be evidence-based and even some of these, the way they are currently used, may be ineffective or even harmful. Recognizing the knowledge deficit and paucity of guidelines on the usage of nebulizers in various settings such as inpatient, out-patient, emergency room, critical care, and domiciliary use in India in a wide variety of indications to standardize nebulization practices and to address many other related issues; National College of Chest Physicians (India), commissioned a National task force consisting of eminent experts in the field of Pulmonary Medicine from different backgrounds and different parts of the country to review the available evidence from the medical literature on the scientific principles and clinical practices of nebulization therapy and to formulate evidence-based guidelines on it. The guideline is based on all possible literature that could be explored with the best available evidence and incorporating expert opinions. To support the guideline with high-quality evidence, a systematic search of the electronic databases was performed to identify the relevant studies, position papers, consensus reports, and recommendations published. Rating of the level of the quality of evidence and the strength of recommendation was done using the GRADE system. Six topics were identified, each given to one group of experts comprising of advisors, chairpersons, convenor and members, and such six groups (A-F) were formed and the consensus recommendations of each group was included as a section in the guidelines (Sections I to VI). The topics included were: A. Introduction, basic principles and technical aspects of nebulization, types of equipment, their choice, use, and maintenance B. Nebulization therapy in obstructive airway diseases C. Nebulization therapy in the intensive care unit D. Use of various drugs (other than bronchodilators and inhaled corticosteroids) by nebulized route and miscellaneous uses of nebulization therapy E. Domiciliary/Home/Maintenance nebulization therapy; public & health care workers education, and F. Nebulization therapy in COVID-19 pandemic and in patients of other contagious viral respiratory infections (included later considering the crisis created due to COVID-19 pandemic). Various issues in different sections have been discussed in the form of questions, followed by point-wise evidence statements based on the existing knowledge, and recommendations have been formulated.
Collapse
Affiliation(s)
- S K Katiyar
- Department of Tuberculosis & Respiratory Diseases, G.S.V.M. Medical College & C.S.J.M. University, Kanpur, Uttar Pradesh, India.
| | - S N Gaur
- Vallabhbhai Patel Chest Institute, University of Delhi, Respiratory Medicine, School of Medical Sciences and Research, Sharda University, Greater NOIDA, Uttar Pradesh, India
| | - R N Solanki
- Department of Tuberculosis & Chest Diseases, B. J. Medical College, Ahmedabad, Gujarat, India
| | - Nikhil Sarangdhar
- Department of Pulmonary Medicine, D. Y. Patil School of Medicine, Navi Mumbai, Maharashtra, India
| | - J C Suri
- Department of Pulmonary, Critical Care & Sleep Medicine, Vardhman Mahavir Medical College & Safdarjung Hospital, New Delhi, India
| | - Raj Kumar
- Vallabhbhai Patel Chest Institute, Department of Pulmonary Medicine, National Centre of Allergy, Asthma & Immunology; University of Delhi, Delhi, India
| | - G C Khilnani
- PSRI Institute of Pulmonary, Critical Care, & Sleep Medicine, PSRI Hospital, Department of Pulmonary Medicine & Sleep Disorders, All India Institute of Medical Sciences, New Delhi, India
| | - Dhruva Chaudhary
- Department of Pulmonary & Critical Care Medicine, Pt. Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences, Rohtak, Haryana, India
| | - Rupak Singla
- Department of Tuberculosis & Respiratory Diseases, National Institute of Tuberculosis & Respiratory Diseases (formerly L.R.S. Institute), Delhi, India
| | - Parvaiz A Koul
- Sher-i-Kashmir Institute of Medical Sciences, Srinagar, Jammu & Kashmir, India
| | - Ashok A Mahashur
- Department of Respiratory Medicine, P. D. Hinduja Hospital, Mumbai, Maharashtra, India
| | - A G Ghoshal
- National Allergy Asthma Bronchitis Institute, Kolkata, West Bengal, India
| | - D Behera
- Department of Pulmonary Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - D J Christopher
- Department of Pulmonary Medicine, Christian Medical College, Vellore, Tamil Nadu, India
| | - Deepak Talwar
- Metro Centre for Respiratory Diseases, Noida, Uttar Pradesh, India
| | | | - H Paramesh
- Paediatric Pulmonologist & Environmentalist, Lakeside Hospital & Education Trust, Bengaluru, Karnataka, India
| | - K B Gupta
- Department of Tuberculosis & Respiratory Medicine, Pt. Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences Rohtak, Haryana, India
| | - Mohan Kumar T
- Department of Pulmonary, Critical Care & Sleep Medicine, One Care Medical Centre, Coimbatore, Tamil Nadu, India
| | - P D Motiani
- Department of Pulmonary Diseases, Dr. S. N. Medical College, Jodhpur, Rajasthan, India
| | - P S Shankar
- SCEO, KBN Hospital, Kalaburagi, Karnataka, India
| | - Rajesh Chawla
- Respiratory and Critical Care Medicine, Indraprastha Apollo Hospitals, New Delhi, India
| | - Randeep Guleria
- All India Institute of Medical Sciences, Department of Pulmonary Medicine & Sleep Disorders, AIIMS, New Delhi, India
| | - S K Jindal
- Department of Pulmonary Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - S K Luhadia
- Department of Tuberculosis and Respiratory Medicine, Geetanjali Medical College and Hospital, Udaipur, Rajasthan, India
| | - V K Arora
- Indian Journal of Tuberculosis, Santosh University, NCR Delhi, National Institute of TB & Respiratory Diseases Delhi, India; JIPMER, Puducherry, India
| | - V K Vijayan
- Vallabhbhai Patel Chest Institute, Department of Pulmonary Medicine, University of Delhi, Delhi, India
| | - Abhishek Faye
- Centre for Lung and Sleep Disorders, Nagpur, Maharashtra, India
| | | | - Amit K Murar
- Respiratory Medicine, Cronus Multi-Specialty Hospital, New Delhi, India
| | - Anand Jaiswal
- Respiratory & Sleep Medicine, Medanta Medicity, Gurugram, Haryana, India
| | - Arunachalam M
- All India Institute of Medical Sciences, New Delhi, India
| | - A K Janmeja
- Department of Respiratory Medicine, Government Medical College, Chandigarh, India
| | - Brijesh Prajapat
- Pulmonary and Critical Care Medicine, Yashoda Hospital and Research Centre, Ghaziabad, Uttar Pradesh, India
| | - C Ravindran
- Department of TB & Chest, Government Medical College, Kozhikode, Kerala, India
| | - Debajyoti Bhattacharyya
- Department of Pulmonary Medicine, Institute of Liver and Biliary Sciences, Army Hospital (Research & Referral), New Delhi, India
| | | | - Inderpaul Singh Sehgal
- Department of Pulmonary Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - J K Samaria
- Centre for Research and Treatment of Allergy, Asthma & Bronchitis, Department of Chest Diseases, IMS, BHU, Varanasi, Uttar Pradesh, India
| | - Jogesh Sarma
- Department of Pulmonary Medicine, Gauhati Medical College and Hospital, Guwahati, Assam, India
| | - Lalit Singh
- Department of Respiratory Medicine, SRMS Institute of Medical Sciences, Bareilly, Uttar Pradesh, India
| | - M K Sen
- Department of Respiratory Medicine, ESIC Medical College, NIT Faridabad, Haryana, India; Department of Pulmonary, Critical Care & Sleep Medicine, Vardhman Mahavir Medical College & Safdarjung Hospital, New Delhi, India
| | - Mahendra K Bainara
- Department of Pulmonary Medicine, R.N.T. Medical College, Udaipur, Rajasthan, India
| | - Mansi Gupta
- Department of Pulmonary Medicine, Sanjay Gandhi PostGraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Nilkanth T Awad
- Department of Pulmonary Medicine, Lokmanya Tilak Municipal Medical College, Mumbai, Maharashtra, India
| | - Narayan Mishra
- Department of Pulmonary Medicine, M.K.C.G. Medical College, Berhampur, Orissa, India
| | - Naveed N Shah
- Department of Pulmonary Medicine, Chest Diseases Hospital, Government Medical College, Srinagar, Jammu & Kashmir, India
| | - Neetu Jain
- Department of Pulmonary, Critical Care & Sleep Medicine, PSRI, New Delhi, India
| | - Prasanta R Mohapatra
- Department of Pulmonary Medicine & Critical Care, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India
| | - Parul Mrigpuri
- Department of Pulmonary Medicine, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | - Pawan Tiwari
- School of Excellence in Pulmonary Medicine, NSCB Medical College, Jabalpur, Madhya Pradesh, India
| | - R Narasimhan
- Department of EBUS and Bronchial Thermoplasty Services at Apollo Hospitals, Chennai, Tamil Nadu, India
| | - R Vijai Kumar
- Department of Pulmonary Medicine, MediCiti Medical College, Hyderabad, Telangana, India
| | - Rajendra Prasad
- Vallabhbhai Patel Chest Institute, University of Delhi and U.P. Rural Institute of Medical Sciences & Research, Safai, Uttar Pradesh, India
| | - Rajesh Swarnakar
- Department of Respiratory, Critical Care, Sleep Medicine and Interventional Pulmonology, Getwell Hospital & Research Institute, Nagpur, Maharashtra, India
| | - Rakesh K Chawla
- Department of, Respiratory Medicine, Critical Care, Sleep & Interventional Pulmonology, Saroj Super Speciality Hospital, Jaipur Golden Hospital, Rajiv Gandhi Cancer Hospital, Delhi, India
| | - Rohit Kumar
- Department of Pulmonary, Critical Care & Sleep Medicine, Vardhman Mahavir Medical College & Safdarjung Hospital, New Delhi, India
| | - S Chakrabarti
- Department of Pulmonary, Critical Care & Sleep Medicine, Vardhman Mahavir Medical College & Safdarjung Hospital, New Delhi, India
| | | | - Saurabh Mittal
- Department of Pulmonary, Critical Care & Sleep Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Sonam Spalgais
- Department of Pulmonary Medicine, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | | | - Surya Kant
- Department of Respiratory (Pulmonary) Medicine, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - V K Singh
- Centre for Visceral Mechanisms, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | - Vijay Hadda
- Department of Pulmonary Medicine & Sleep Disorders, All India Institute of Medical Sciences, New Delhi, India
| | - Vikas Kumar
- All India Institute of Medical Sciences, Raipur, Chhattisgarh, India
| | - Virendra Singh
- Mahavir Jaipuria Rajasthan Hospital, Jaipur, Rajasthan, India
| | - Vishal Chopra
- Department of Chest & Tuberculosis, Government Medical College, Patiala, Punjab, India
| | - Visweswaran B
- Interventional Pulmonology, Yashoda Hospitals, Hyderabad, Telangana, India
| |
Collapse
|
46
|
Ngashangva L, Hemdan BA, El-Liethy MA, Bachu V, Minteer SD, Goswami P. Emerging Bioanalytical Devices and Platforms for Rapid Detection of Pathogens in Environmental Samples. MICROMACHINES 2022; 13:mi13071083. [PMID: 35888900 PMCID: PMC9321031 DOI: 10.3390/mi13071083] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 02/05/2023]
Abstract
The development of robust bioanalytical devices and biosensors for infectious pathogens is progressing well with the advent of new materials, concepts, and technology. The progress is also stepping towards developing high throughput screening technologies that can quickly identify, differentiate, and determine the concentration of harmful pathogens, facilitating the decision-making process for their elimination and therapeutic interventions in large-scale operations. Recently, much effort has been focused on upgrading these analytical devices to an intelligent technological platform by integrating them with modern communication systems, such as the internet of things (IoT) and machine learning (ML), to expand their application horizon. This review outlines the recent development and applications of bioanalytical devices and biosensors to detect pathogenic microbes in environmental samples. First, the nature of the recent outbreaks of pathogenic microbes such as foodborne, waterborne, and airborne pathogens and microbial toxins are discussed to understand the severity of the problems. Next, the discussion focuses on the detection systems chronologically, starting with the conventional methods, advanced techniques, and emerging technologies, such as biosensors and other portable devices and detection platforms for pathogens. Finally, the progress on multiplex assays, wearable devices, and integration of smartphone technologies to facilitate pathogen detection systems for wider applications are highlighted.
Collapse
Affiliation(s)
- Lightson Ngashangva
- Transdisciplinary Biology, Rajiv Gandhi Centre for Biotechnology (RGCB), Thiruvanthapuram, Kerala 695014, India;
| | - Bahaa A. Hemdan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
- Water Pollution Research Department, Environmental and Climate Change Research Institute, National Research Centre, 33 El Buhouth Street, Cairo P.O. Box 12622, Egypt;
| | - Mohamed Azab El-Liethy
- Water Pollution Research Department, Environmental and Climate Change Research Institute, National Research Centre, 33 El Buhouth Street, Cairo P.O. Box 12622, Egypt;
| | - Vinay Bachu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
| | - Shelley D. Minteer
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, UT 84112, USA
- Correspondence: (S.D.M.); (P.G.)
| | - Pranab Goswami
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
- Correspondence: (S.D.M.); (P.G.)
| |
Collapse
|
47
|
van Beest MRRS, Arpino F, Hlinka O, Sauret E, van Beest NRTP, Humphries RS, Buonanno G, Morawska L, Governatori G, Motta N. Influence of indoor airflow on particle spread of a single breath and cough in enclosures: Does opening a window really 'help'? ATMOSPHERIC POLLUTION RESEARCH 2022; 13:101473. [PMID: 35692900 PMCID: PMC9167821 DOI: 10.1016/j.apr.2022.101473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 05/27/2022] [Accepted: 05/29/2022] [Indexed: 06/15/2023]
Abstract
The spread of respiratory diseases via aerosol particles in indoor settings is of significant concern. The SARS-CoV-2 virus has been found to spread widely in confined enclosures like hotels, hospitals, cruise ships, prisons, and churches. Particles exhaled from a person indoors can remain suspended long enough for increasing the opportunity for particles to spread spatially. Careful consideration of the ventilation system is essential to minimise the spread of particles containing infectious pathogens. Previous studies have shown that indoor airflow induced by opened windows would minimise the spread of particles. However, how outdoor airflow through an open window influences the indoor airflow has not been considered. The aim of this study is to provide a clear understanding of the indoor particle spread across multiple rooms, in a situation similar to what is found in quarantine hotels and cruise ships, using a combination of HVAC (Heating, Ventilation and Air-Conditioning) ventilation and an opening window. Using a previously validated mathematical model, we used 3D CFD (computational fluid dynamics) simulations to investigate to what extent different indoor airflow scenarios contribute to the transport of a single injection of particles ( 1 . 3 μ m ) in a basic 3D multi-room indoor environment. Although this study is limited to short times, we demonstrate that in certain conditions approximately 80% of the particles move from one room to the corridor and over 60% move to the nearby room within 5 to 15 s. Our results provide additional information to help identifying relevant recommendations to limit particles from spreading in enclosures.
Collapse
Affiliation(s)
- M R R S van Beest
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Australia
- Software Systems Group, CSIRO | DATA61, Brisbane, Queensland, Australia
| | - F Arpino
- Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy
| | - O Hlinka
- Information Management & Technology (IM&T), CSIRO, Pullenvale, Queensland, Australia
| | - E Sauret
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, Australia
| | - N R T P van Beest
- Software Systems Group, CSIRO | DATA61, Brisbane, Queensland, Australia
| | - R S Humphries
- Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, Victoria, Australia
| | - G Buonanno
- Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy
| | - L Morawska
- School of Earth and Atmospheric Sciences, Queensland University of Technology, Brisbane, Australia
| | - G Governatori
- Software Systems Group, CSIRO | DATA61, Brisbane, Queensland, Australia
| | - N Motta
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Australia
| |
Collapse
|
48
|
Hildebrandt R, Skubacz K, Chmielewska I, Dyduch Z, Zgórska A, Smoliński A. Implementing Silica Nanoparticles in the Study of the Airborne Transmission of SARS-CoV-2. Molecules 2022; 27:3896. [PMID: 35745019 PMCID: PMC9230593 DOI: 10.3390/molecules27123896] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/09/2022] [Accepted: 06/14/2022] [Indexed: 11/16/2022] Open
Abstract
Aerosol transmission constitutes one of the major transmission routes of the SARS-CoV-2 pathogen. Due to the pathogen's properties, research on its airborne transmission has some limitations. This paper focuses on silica nanoparticles (SiO2) of 40 and 200 nm sizes as the physicochemical markers of a single SARS-CoV-2 particle enabling experiments on the transmission of bioaerosols in public spaces. Mixtures of a determined silica concentration were sprayed on as an aerosol, whose particles, sedimented on dedicated matrices, were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Since it was not possible to quantitatively identify the markers based on the obtained images, the filters exposed with the AirSampler aspirator were analyzed based on inductively coupled plasma optical emission spectroscopy (ICP-OES). The ICP-OES method enabled us to determine the concentration of silica after extracting the marker from the filter, and consequently to estimate the number of markers. The developed procedure opens up the possibility of the quantitative estimation of the spread of the coronavirus, for example in studies on the aerosol transmission of the pathogen in an open environment where biological markers-surrogates included-cannot be used.
Collapse
Affiliation(s)
- Robert Hildebrandt
- Department of Underground Research and Surface Maintenance, Central Mining Institute, Podleska 72, 43-190 Mikołów, Poland
| | - Krystian Skubacz
- Silesian Centre for Environmental Radioactivity, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland; (K.S.); (I.C.)
| | - Izabela Chmielewska
- Silesian Centre for Environmental Radioactivity, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland; (K.S.); (I.C.)
| | - Zdzisław Dyduch
- Department of Dust Hazard Control, Central Mining Institute, Podleska 72, 43-190 Mikołów, Poland;
| | - Aleksandra Zgórska
- Department of Water Protection, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland;
| | - Adam Smoliński
- Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
| |
Collapse
|
49
|
Wang CT, Xu JC, Chan KC, Lee HH, Tso CY, Lin CSK, Chao CYH, Fu SC. Infection control measures for public transportation derived from the flow dynamics of obstructed cough jet. JOURNAL OF AEROSOL SCIENCE 2022; 163:105995. [PMID: 35382445 PMCID: PMC8971108 DOI: 10.1016/j.jaerosci.2022.105995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 03/21/2022] [Accepted: 03/21/2022] [Indexed: 06/14/2023]
Abstract
During the COVID-19 pandemic, WHO and CDC suggest people stay 1 m and 1.8 m away from others, respectively. Keeping social distance can avoid close contact and mitigate infection spread. Many researchers suspect that suggested distances are not enough because aerosols can spread up to 7-8 m away. Despite the debate on social distance, these social distances rely on unobstructed respiratory activities such as coughing and sneezing. Differently, in this work, we focused on the most common but less studied aerosol spread from an obstructed cough. The flow dynamics of a cough jet blocked by the backrest and gasper jet in a cabin environment was characterized by the particle image velocimetry (PIV) technique. It was proved that the backrest and the gasper jet can prevent the front passenger from droplet spray in public transportation where maintaining social distance was difficult. A model was developed to describe the cough jet trajectory due to the gasper jet, which matched well with PIV results. It was found that buoyancy and inside droplets almost do not affect the short-range cough jet trajectory. Infection control measures were suggested for public transportation, including using backrest/gasper jet, installing localized exhaust, and surface cleaning of the backrest.
Collapse
Affiliation(s)
- C T Wang
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - J C Xu
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - K C Chan
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - H H Lee
- Department of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - C Y Tso
- Department of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Carol S K Lin
- Department of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Christopher Y H Chao
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
- Department of Building Environment and Energy Engineering & Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - S C Fu
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| |
Collapse
|
50
|
Wang Y, Wu M, Li Y, Yuen HH, He ML. The effects of SARS-CoV-2 infection on modulating innate immunity and strategies of combating inflammatory response for COVID-19 therapy. J Biomed Sci 2022; 29:27. [PMID: 35505345 PMCID: PMC9063252 DOI: 10.1186/s12929-022-00811-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 04/27/2022] [Indexed: 12/15/2022] Open
Abstract
The global pandemic of COVID-19 has caused huge causality and unquantifiable loss of social wealth. The innate immune response is the first line of defense against SARS-CoV-2 infection. However, strong inflammatory response associated with dysregulation of innate immunity causes severe acute respiratory syndrome (SARS) and death. In this review, we update the current knowledge on how SARS-CoV-2 modulates the host innate immune response for its evasion from host defense and its corresponding pathogenesis caused by cytokine storm. We emphasize Type I interferon response and the strategies of evading innate immune defense used by SARS-CoV-2. We also extensively discuss the cells and their function involved in the innate immune response and inflammatory response, as well as the promises and challenges of drugs targeting excessive inflammation for antiviral treatment. This review would help us to figure out the current challenge questions of SARS-CoV-2 infection on innate immunity and directions for future studies.
Collapse
Affiliation(s)
- Yiran Wang
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Mandi Wu
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Yichen Li
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Ho Him Yuen
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China
| | - Ming-Liang He
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China. .,CityU Shenzhen Research Institute, Nanshan, Shenzhen, China.
| |
Collapse
|