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Nguyen SN, Vu LT, Nguyen HT, Dao GH, Nguyen ANT. Clinical Epidemiological Characteristics and Risk Factors for Severity of SARS-CoV-2 Pneumonia in Pediatric Patients: A Hospital-Based Study in Vietnam. Cureus 2024; 16:e58371. [PMID: 38756320 PMCID: PMC11097285 DOI: 10.7759/cureus.58371] [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] [Accepted: 04/14/2024] [Indexed: 05/18/2024] Open
Abstract
Introduction Coronavirus disease (COVID-19) is an infectious disease caused by SARS-CoV-2, which can cause organ failure in several organs, cardiac problems, or acute respiratory distress syndrome (ARDS). Identifying clinical epidemiological characteristics and risk factors for complications of COVID-19 allows clinicians to diagnose and treat promptly. Objectives This study aims to describe the clinical epidemiological characteristics of COVID-19 and assess risk factors for the severity of SARS-CoV-2 pneumonia in children treated at Haiphong Children's Hospital. Methods A descriptive cross-sectional study was conducted in Haiphong Children's Hospital, Haiphong, Vietnam, for one year, from January 1, 2022, to December 31, 2022. Results In our study, 540 children were evaluated; the male-to-female ratio was 1.48/1; the median age was 23 months (IQR=6-74); Children aged under one year accounted for the highest proportion (n=202; 37.4%); 40 (7.4%) children had underlying illnesses. The number of admitted patients diagnosed with COVID-19 peaked in February 2022. Regarding severity, 380 (70.4%) cases were mild, 136 (25.2%) were moderate, only 24 (4.4%) cases were severe, and no children died. Common symptoms were fever in 483 (89.4%), coughing in 399 (73.9%), and tachypnea in 163 (30.2%) children. Laboratory features: white blood cell count, platelet count, serum CRP, and coagulation test showed little change. Around 116 (21.5%) had lymphopenia and 148 (27.4%) had pneumonia. Patients under one year were approximately 1.64 times more likely to experience pneumonia complications from COVID-19 than those without such a history (OR=1.64, 95%CI = 1.12 - 2.41, p=0.0112). Patients with underlying conditions were approximately 2.08 times more likely to experience pneumonia complications from COVID-19 compared to those without such conditions (OR=2.08, 95%CI =1.08 - 4.02, p=0.0289). Conclusion In COVID-19 pediatric patients, the severity of the disease was mild to moderate without any mortality. Children aged under one year accounted for the highest proportion of all COVID-19 patients. This study found that age under one year and underlying illnesses are related to pneumonia in COVID-19 pediatric patients.
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Affiliation(s)
- Sang N Nguyen
- Pediatrics, Haiphong University of Medicine and Pharmacy, Haiphong, VNM
| | - Lam T Vu
- Pediatrics, Haiphong University of Medicine and Pharmacy, Haiphong, VNM
| | - Ha T Nguyen
- Otolaryngology, Hanoi Medical University, Hanoi, VNM
| | - Giang H Dao
- Pediatrics, Haiphong University of Medicine and Pharmacy, Haiphong, VNM
| | - Anh Ngoc T Nguyen
- Pediatrics, Haiphong University of Medicine and Pharmacy, Haiphong, VNM
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Trang UTH, Phuong HVM, Hoang NH, Son NV, Thanh LT, Hang NLK, Cuong VD, Huong TTT, Hien NT, Anh NP, Mai LQ. Circulation of human respiratory syncytial virus and new ON1 genotype in northern Viet Nam, 2017-2020. Western Pac Surveill Response J 2023; 14:1-9. [PMID: 38021214 PMCID: PMC10646430 DOI: 10.5365/wpsar.2023.14.4.990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023] Open
Abstract
Objective Human respiratory syncytial virus (RSV) is a primary cause of paediatric severe acute respiratory infection (SARI) worldwide, especially in developing countries. We investigated the genetic characteristics of RSV in northern Viet Nam to determine the prevalence and distribution of subtypes as well as the diversity and transmission patterns of genotypes. Methods In two facilities, from January 2017 to December 2020, 1563 clinical specimens were collected from paediatric patients hospitalized with SARI and tested for RSV. Selected positive samples underwent sequencing analysis targeting the second hypervariable region of the G gene using next-generation sequencing. Results The RSV positivity rate was 28.02% (438/1563 samples), and prevalence was highest in children aged < 1 year (43.84%; 192/438). Subtype RSV-A accounted for 53.42% (234/438) of cases, RSV-B for 45.89% (201/438), and there was coinfection in 0.68% (3/438). Both subtypes cocirculated and peaked during August-September in each year of the study. Phylogenetic analysis showed that RSV-A samples belonged to the ON1 genotype, which has three subgenotypes: ON1.1, ON1.2 and ON1.3. However, we did not find the 72-nucleotide duplication in the second hypervariable region of the G gene, a characteristic of genotype ON1, in any RSV-A samples. RSV-B samples belonged to genotype BA9. Discussion Our results provide additional molecular characterization of RSV infections in Viet Nam. Specially, our study is the first to report the absence of the 72-nucleotide duplication in the G gene of RSV-A genotype ON1 in Viet Nam, which may help in understanding the genetic evolution of RSV and be useful for vaccine development in the future.
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Affiliation(s)
- Ung Thi Hong Trang
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | | | - Nguyen Huy Hoang
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
- Institute of Genome Research, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
| | - Nguyen Vu Son
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | - Le Thi Thanh
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | | | - Vuong Duc Cuong
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | | | - Nguyen Thi Hien
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
| | | | - Le Quynh Mai
- National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
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Tran XD, Hoang VT, Dang TTD, Vu TP, To MM, Tran TK, Do MD, Nguyen DC, Nguyen QT, Colson P, Parola P, Marty P, Gautret P. Aetiology of Acute Undifferentiated Fever Among Children Under the Age of Five in Vietnam: A Prospective Study. J Epidemiol Glob Health 2023; 13:163-172. [PMID: 37258852 PMCID: PMC10231849 DOI: 10.1007/s44197-023-00121-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 05/18/2023] [Indexed: 06/02/2023] Open
Abstract
BACKGROUND To investigate the aetiology of acute undifferentiated fever (AUF) among children under the age of five in Vietnam. METHODS This prospective study was conducted in the Thai Binh paediatric hospital, between July 2020 and July 2021 among children with AUF at admission. Real-time PCR testing 18 microbial pathogens were done on blood samples. RESULTS 286 children were included, with median age of 16 months. 64.7% were male. 53.9% were positive for at least one pathogen by PCR. Enterovirus, human herpesvirus 6, adenovirus, and varicella zoster virus PCR were positive for 31.1, 12.6, 1.4, and 1.0% patients, respectively. Other pathogens tested negative by PCR. During the hospital stay, based on clinical criteria 47.2% children secondarily presented with signs of respiratory tract infections, 18.9% had hand, foot and mouth disease, 4.6% had chickenpox. 4.2% presented signs of central nervous system infections, 1.0% had dengue (antigenic test) and 1.0% had signs of gastrointestinal infection. Finally, 23.1% patients presented a fever with or without a rash and no other symptoms and ultimately received a diagnosis of AUF. CONCLUSION Real-time PCR of blood is useful for detecting pathogens and diagnosing infectious causes of AUF. Further prospective studies with blood and urine culture testing and PCR investigation of not only blood but also cerebrospinal fluid, throat, and skin samples according to symptoms would be of interest to confirm the predominance of viral infections in children with AUF and to guide therapeutic options.
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Affiliation(s)
- Xuan Duong Tran
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam
- IHU-Méditerranée Infection, Marseille, France
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France
| | - Van Thuan Hoang
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam
| | | | | | - Minh Manh To
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam
| | | | - Manh Dung Do
- Thai Binh Paediatric Hospital, Thai Binh, Vietnam
| | - Duy Cuong Nguyen
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam
| | - Quoc Tien Nguyen
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam
| | - Philippe Colson
- IHU-Méditerranée Infection, Marseille, France
- Aix Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France
| | - Philippe Parola
- IHU-Méditerranée Infection, Marseille, France
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France
| | - Pierre Marty
- Université Côte D'Azur, Inserm, C3M, Nice Cedex 3, France
- Parasitologie-Mycologie, Centre Hospitalier Universitaire L'Archet, Nice Cedex 3, France
| | - Philippe Gautret
- Thai Binh University of Medicine and Pharmacy, Thai Binh, Vietnam.
- IHU-Méditerranée Infection, Marseille, France.
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France.
- VITROME, Institut Hospitalo-Universitaire Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France.
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Chimeddorj B, Bailie CR, Mandakh U, Price DJ, Bayartsogt B, Meagher N, Altanbayar O, Magvan B, Deleg Z, Gantumur A, Byambaa O, Nyamdavaa E, Enkhtugs K, Munkhbayar U, Bayanjargal B, Badamsambuu T, Dashtseren M, Amartuvshin T, Narmandakh Z, Togoo K, Boldbaatar EA, Bat-Erdene A, Chimeddorj U, Nyamdavaa K, Tsevegmid E, Batjargal O, Enebish O, Enebish G, Batchuluun B, Zulmunkh G, Byambatsogt G, Enebish T, Le LV, Bergeri I, McVernon J, Erkhembayar R. SARS-CoV-2 seroepidemiology in Mongolia, 2020-2021: a longitudinal national study. THE LANCET REGIONAL HEALTH. WESTERN PACIFIC 2023; 36:100760. [PMID: 37360871 PMCID: PMC10084888 DOI: 10.1016/j.lanwpc.2023.100760] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 03/03/2023] [Accepted: 03/21/2023] [Indexed: 06/28/2023]
Abstract
Background The COVID-19 pandemic has global impacts but is relatively understudied in developing countries. Mongolia, a lower-middle-income country, instituted strict control measures in early 2020 and avoided widespread transmission until vaccines became available in February, 2021. Mongolia achieved its 60% vaccination coverage goal by July 2021. We investigated the distribution and determinants of SARS-CoV-2 seroprevalence in Mongolia over 2020 and 2021. Methods We performed a longitudinal seroepidemiologic study aligned with WHO's Unity Studies protocols. We collected data from a panel of 5000 individuals in four rounds between October 2020 and December 2021. We selected participants through local health centres across Mongolia by age-stratified multi-stage cluster sampling. We tested serum for the presence of total antibodies against SARS-CoV-2 receptor-binding domain, and levels of anti-SARS-CoV-2 spike IgG and neutralising antibodies. We linked participant data with national mortality, COVID-19 case, and vaccination registries. We estimated population seroprevalence and vaccine uptake, as well as unvaccinated population prior-infection prevalence. Findings At the final round in late 2021, 82% (n = 4088) of participants completed follow-up. Estimated seroprevalence increased from 1.5% (95% CI: 1.2-2.0), to 82.3% (95% CI: 79.5-84.8) between late-2020 and late-2021. At the final round an estimated 62.4% (95% CI: 60.2-64.5) of the population were vaccinated, and of the unvaccinated population 64.5% (95% CI: 59.7-69.0) had been infected. Cumulative case ascertainment in the unvaccinated was 22.8% (95% CI: 19.1%-26.9%) and the overall infection-fatality ratio was 0.100% (95% CI: 0.088-0.124). Health workers had higher odds for being COVID-19 confirmed cases at all rounds. Males (1.72 (95% CI: 1.33-2.22)) and adults aged 20 and above (12.70 (95% CI: 8.14-20.26)) had higher odds for seroconverting by mid-2021. Among the seropositive, 87.1% (95% CI: 82.3%-90.8%) had SARS-CoV-2 neutralising antibodies by late 2021. Interpretation Our study enabled tracking of SARS-CoV-2 serological markers in the Mongolian population over one year. We found low SARS-CoV-2 seroprevalence in 2020 and early 2021, with seropositivity increasing over a 3-month interval in 2021 due to vaccine roll out and rapid infection of most of the unvaccinated population. Despite high seroprevalence in Mongolia amongst both vaccinated and unvaccinated individuals by end-2021, the SARS-CoV-2 Omicron immune escape variant caused a substantial epidemic. Funding World Health Organization, WHO UNITY Studies initiative, with funding by the COVID-19 Solidarity Response Fund and the German Federal Ministry of Health (BMG) COVID-19 Research and development. The Ministry of Health, Mongolia partially funded this study.
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Affiliation(s)
- Battogtokh Chimeddorj
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
- Institute of Biomedical Sciences, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Christopher R. Bailie
- Department of Infectious Diseases, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
| | - Undram Mandakh
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - David J. Price
- Department of Infectious Diseases, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
- Centre for Epidemiology & Biostatistics, Melbourne School of Population & Global Health, The University of Melbourne, Melbourne, Australia
| | - Batzorig Bayartsogt
- Department of Epidemiology and Biostatistics, School of Public Health, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Niamh Meagher
- Department of Infectious Diseases, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
| | - Oyunbaatar Altanbayar
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Battur Magvan
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Zolzaya Deleg
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Anuujin Gantumur
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Otgonjargal Byambaa
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Enkhgerel Nyamdavaa
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Khangai Enkhtugs
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Usukhbayar Munkhbayar
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Batkhuu Bayanjargal
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Tuyajargal Badamsambuu
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Myagmartseren Dashtseren
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Tsolmontuya Amartuvshin
- Department of Family Medicine, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Zolmunkh Narmandakh
- Department of Immunology, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Khongorzul Togoo
- Department of Immunology, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Enkh-Amar Boldbaatar
- Department of Immunology, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Ariunzaya Bat-Erdene
- Department of Immunology, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | | | | | | | - Ochbadrakh Batjargal
- Department of Molecular Biology and Genetics, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | | | - Gerelmaa Enebish
- Department of Microbiology and Infection Prevention Control, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Batzaya Batchuluun
- Central Clinical Laboratory, Mongolia Japan Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Gereltsetseg Zulmunkh
- Central Clinical Laboratory, Mongolia Japan Hospital, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Ganbaatar Byambatsogt
- Department of Biochemistry, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
| | - Temuulen Enebish
- Regional Office for the Western Pacific, World Health Organization, Manila, Philippines
| | - Linh-Vi Le
- Regional Office for the Western Pacific, World Health Organization, Manila, Philippines
| | | | - Jodie McVernon
- Department of Infectious Diseases, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
- Victorian Infectious Diseases Reference Laboratory at the Peter Doherty Institute for Infection and Immunity, Royal Melbourne Hospital, Australia
| | - Ryenchindorj Erkhembayar
- Department of International Cyber Education, Graduate School, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
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Hoang HT, Nguyen XTK, Huynh SV, Hua TD, Tran HTT, Tran-Chi VL. The effect of vaccination beliefs regarding vaccination benefits and COVID-19 fear on the number of vaccination injections. Front Psychol 2022; 13:968902. [PMID: 36337543 PMCID: PMC9627305 DOI: 10.3389/fpsyg.2022.968902] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 09/21/2022] [Indexed: 11/23/2022] Open
Abstract
The Coronavirus disease pandemic of 2019 is a vast worldwide public health hazard, impacting people of all ages and socioeconomic statuses. Vaccination is one of the most effective methods of controlling a pandemic like COVID-19. This study aims to investigate the relationship between the number of vaccination injections and fear of COVID-19 and test whether beliefs benefit from vaccination COVID-19 mediate the effect of fear of COVID-19 on the number of vaccination injections. A total of 649 Vietnamese adults were enrolled online to finish answering, including scales The Health Belief Model (HBM) and The Fear of COVID-19 (FCV-19S), consisting of 340 (52.4%) males and 309 (47.6%) females. The data were analyzed using variance, regression, and a simple mediation model. The total score of COVID-19 fear was M = 22.26, SD = 5.49. Vietnamese fear of COVID-19 was at a medium level. Our results suggest that 18- to 20-year-olds are more fearful of COVID-19 than others. People who received the first dosage exhibited a greater fear of COVID-19 than those who received the second dose and were not inoculated. Additionally, the beliefs benefit of vaccination COVID-19 has a role in the relationship between the number of vaccination injections and fear of COVID-19. During the pandemic, adults in Vietnam are more afraid of COVID-19 than during prior outbreaks. Besides, the Vietnamese populace demonstrated a considerable demand for and high acceptability of the COVID-19 vaccine. The current study indicates that psychological counselors and therapists should counsel clients on the value of vaccination and address the fear of COVID-19 as public understanding of the benefits of vaccines increases. To further clarify the effect of this issue on the correlation between fear of COVID-19 and the number of vaccinations, the results of this study indicate that the existing vaccine communication factor for COVID-19 vaccination should be modified to increase confidence in the benefits of immunization.
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Affiliation(s)
- Hai The Hoang
- Faculty of Psychology and Education, The University of Danang, University of Science and Education, Danang, Vietnam
| | - Xuan Thanh Kieu Nguyen
- Faculty of Social Sciences and Public Relations, HUTECH University, Ho Chi Minh City, Vietnam
| | - Son Van Huynh
- Faculty of Psychology, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam
| | - Thuy Doan Hua
- Faculty of Psychology, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam
| | - Hien Thi Thuy Tran
- Faculty of Psychology, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam
| | - Vinh-Long Tran-Chi
- Faculty of Psychology, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam
- *Correspondence: Vinh-Long Tran-Chi
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Hoang VT, Pham TD, Nguyen QT, Nguyen DC, Nguyen DT, Nguyen TB, Tran TKT, Phan TL, Vo PLN, Dao TL, Fenollar F, Gautret P. Seroprevalence of SARS-CoV-2 among high-density communities and hyper-endemicity of COVID-19 in Vietnam. Trop Med Int Health 2022; 27:515-521. [PMID: 35303386 PMCID: PMC9115418 DOI: 10.1111/tmi.13744] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To assess the magnitude of active and recovering COVID-19 patients among at-risk communities and to identify the factors associated with positive serology. METHODS Four hundred and eighty-three close contacts of COVID-19 patients residing in Ho Chi Minh City, Vietnam, during the fourth wave of the COVID-19 epidemic (September and October 2021) were included. Five weeks after exposure to a COVID-19 patient, they underwent a serology test using the BIOSYNEX COVID-19 BSS kit. RESULTS The median age of participants was 37 years. A total of 34.6% individuals presented at least one clinical symptom between the time of contact with the COVID-19 patient and inclusion in study. A total of 1.7% unvaccinated individuals tested positive for SARS-CoV-2 using real-time PCR, and 9.5% had evidence of recent infection (positive PCR and/or IgM). A further 26.7% unvaccinated individuals presented evidence of a past infection (positive IgG only). Socio-demographic characteristics, vaccination status and clinical symptoms were not associated with a positive IgM test. CONCLUSION This is the first serosurvey conducted during the fourth wave of the epidemic in Vietnam. It revealed a seropositivity rate higher than in previous studies and confirmed the hyperendemicity of SARS-CoV-2. Testing using rapid serological tests proved to be a reliable, easy-to-use method and enabled a rapid estimation of the burden of COVID-19.
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Affiliation(s)
- Van Thuan Hoang
- Thai Binh University of Medicine and PharmacyThai BinhVietnam
| | - Thi Dung Pham
- Thai Binh University of Medicine and PharmacyThai BinhVietnam
| | | | | | | | | | | | - Trong Lan Phan
- General Department of Preventive MedicineMinistry of HealthHa NoiVietnam
| | | | - Thi Loi Dao
- Thai Binh University of Medicine and PharmacyThai BinhVietnam
| | - Florence Fenollar
- Aix Marseille UnivIRDAP‐HMSSA, VITROMEMarseilleFrance
- IHU‐Méditerranée InfectionMarseilleFrance
| | - Philippe Gautret
- Aix Marseille UnivIRDAP‐HMSSA, VITROMEMarseilleFrance
- IHU‐Méditerranée InfectionMarseilleFrance
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