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Duval E, Blanchet S, Quéméré E, Jacquin L, Veyssière C, Loot G. When does a parasite become a disease? eDNA unravels complex host-pathogen dynamics across environmental stress gradients in wild salmonid populations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174367. [PMID: 38955267 DOI: 10.1016/j.scitotenv.2024.174367] [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: 05/09/2024] [Revised: 06/20/2024] [Accepted: 06/27/2024] [Indexed: 07/04/2024]
Abstract
Infectious diseases stem from disrupted interactions among hosts, parasites, and the environment. Both abiotic and biotic factors can influence infection outcomes by shaping the abundance of a parasite's infective stages, as well as the host's ability to fight infection. However, disentangling these mechanisms within natural ecosystems remains challenging. Here, combining environmental DNA analysis and niche modelling at a regional scale, we uncovered the biotic and abiotic drivers of an infectious disease of salmonid fish, triggered by the parasite Tetracapsuloides bryosalmonae. We found that the occurrence and abundance of the parasite in the water-i.e., the propagule pressure- were mainly correlated to the abundances of its two primary hosts, the bryozoan Fredericella sultana and the fish Salmo trutta, but poorly to local abiotic environmental stressors. In contrast, the occurrence and abundance of parasites within fish hosts-i.e., proxies for disease emergence-were closely linked to environmental stressors (water temperature, agricultural activities, dams), and to a lesser extent to parasite propagule pressure. These results suggest that pathogen distribution alone cannot predict the risk of disease in wildlife, and that local anthropogenic stressors may play a pivotal role in disease emergence among wild host populations, likely by modulating the hosts' immune response. Our study sheds light on the intricate interplay between biotic and abiotic factors in shaping pathogen distribution and raises concerns about the effects of global change on pathogen emergence.
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Affiliation(s)
- Eloïse Duval
- Bureau d'études Fish-Pass, 18 rue de la plaine, 35890 Laillé, France.
| | - Simon Blanchet
- CNRS, Station d'Écologie Théorique et Expérimentale du CNRS, UAR-2029, 2 route du CNRS, F-09200 Moulis, France.
| | - Erwan Quéméré
- DECOD (Ecosystem Dynamics and Sustainability), INRAE, Institut Agro, IFREMER, 65 rue de Saint Brieuc F-35042, Rennes, France
| | - Lisa Jacquin
- Université Toulouse III Paul Sabatier, CNRS, IRD, UMR-5300 CRBE (Centre de Recherche sur la Biodiversité et l'Environnement), 118 route de Narbonne, F-31062 Toulouse, France; Institut Universitaire de France, Paris, France
| | - Charlotte Veyssière
- Université Toulouse III Paul Sabatier, CNRS, IRD, UMR-5300 CRBE (Centre de Recherche sur la Biodiversité et l'Environnement), 118 route de Narbonne, F-31062 Toulouse, France
| | - Géraldine Loot
- Université Toulouse III Paul Sabatier, CNRS, IRD, UMR-5300 CRBE (Centre de Recherche sur la Biodiversité et l'Environnement), 118 route de Narbonne, F-31062 Toulouse, France; Institut Universitaire de France, Paris, France
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Paknia F, Roostaee M, Isaei E, Mashhoori MS, Sargazi G, Barani M, Amirbeigi A. Role of Metal-Organic Frameworks (MOFs) in treating and diagnosing microbial infections. Int J Biol Macromol 2024; 262:130021. [PMID: 38331063 DOI: 10.1016/j.ijbiomac.2024.130021] [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: 07/31/2023] [Revised: 01/22/2024] [Accepted: 02/05/2024] [Indexed: 02/10/2024]
Abstract
This review article highlights the innovative role of metal-organic frameworks (MOFs) in addressing global healthcare challenges related to microbial infections. MOFs, comprised of metal nodes and organic ligands, offer unique properties that can be applied in the treatment and diagnosis of these infections. Traditional methods, such as antibiotics and conventional diagnostics, face issues such as antibiotic resistance and diagnostic limitations. MOFs, with their highly porous and customizable structure, can encapsulate and deliver therapeutic or diagnostic molecules precisely. Their large surface area and customizable pore structures allow for sensitive detection and selective recognition of microbial pathogens. They also show potential in delivering therapeutic agents to infection sites, enabling controlled release and possible synergistic effects. However, challenges like optimizing synthesis techniques, enhancing stability, and developing targeted delivery systems remain. Regulatory and safety considerations for clinical translation also need to be addressed. This review not only explores the potential of MOFs in treating and diagnosing microbial infections but also emphasizes their unique approach and discusses existing challenges and future directions.
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Affiliation(s)
- Fatemeh Paknia
- Department of Nanobiotechnology, Faculty of Biological Sciences, Tarbiat Modares University, Tehran 14115-154, Iran
| | - Maryam Roostaee
- Department of Chemistry, Faculty of Sciences, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Elham Isaei
- Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran.
| | - Mahboobeh-Sadat Mashhoori
- Department of Chemistry, Faculty of Science, University of Birjand, P.O.Box 97175-615, Birjand, Iran
| | - Ghasem Sargazi
- Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran
| | - Mahmood Barani
- Student Research Committee, Kerman University of Medical Sciences, Kerman 7616913555, Iran; Medical Mycology and Bacteriology Research Center, Kerman University of Medical Sciences, Kerman 7616913555, Iran.
| | - Alireza Amirbeigi
- Department of General Surgery, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran.
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3
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Minatel VM, Prudencio CR, Barraviera B, Ferreira RS. Nanobodies: a promising approach to treatment of viral diseases. Front Immunol 2024; 14:1303353. [PMID: 38322011 PMCID: PMC10844482 DOI: 10.3389/fimmu.2023.1303353] [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: 09/29/2023] [Accepted: 12/12/2023] [Indexed: 02/08/2024] Open
Abstract
Since their discovery in the 1990s, heavy chain antibodies have garnered significant interest in the scientific community. These antibodies, found in camelids such as llamas and alpacas, exhibit distinct characteristics from conventional antibodies due to the absence of a light chain in their structure. Furthermore, they possess a single antigen-binding domain known as VHH or Nanobody (Nb). With a small size of approximately 15 kDa, these Nbs demonstrate improved characteristics compared to conventional antibodies, including greater physicochemical stability and enhanced biodistribution, enabling them to bind inaccessible epitopes more effectively. As a result, Nbs have found numerous applications in various medical and veterinary fields, particularly in diagnostics and therapeutics. Advances in biotechnology have made the production of recombinant antibodies feasible and compatible with large-scale manufacturing. Through the construction of immune phage libraries that display VHHs and subsequent selection through biopanning, it has become possible to isolate specific Nbs targeting pharmaceutical targets of interest, such as viruses. This review describes the processes involved in nanobody production, from hyperimmunization to purification, with the aim of their application in the pharmaceutical industry.
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Affiliation(s)
- Vitória Meneghetti Minatel
- Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP—Univ Estadual Paulista), Botucatu, São Paulo, Brazil
| | | | - Benedito Barraviera
- Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP—Univ Estadual Paulista), Botucatu, São Paulo, Brazil
- Graduate Program in Tropical Diseases, Botucatu Medical School (FMB), São Paulo State University (UNESP—Univ Estadual Paulista), Botucatu, São Paulo, Brazil
| | - Rui Seabra Ferreira
- Center for the Study of Venoms and Venomous Animals (CEVAP), São Paulo State University (UNESP—Univ Estadual Paulista), Botucatu, São Paulo, Brazil
- Graduate Program in Tropical Diseases, Botucatu Medical School (FMB), São Paulo State University (UNESP—Univ Estadual Paulista), Botucatu, São Paulo, Brazil
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4
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Talukder B, Schubert JE, Tofighi M, Likongwe PJ, Choi EY, Mphepo GY, Asgary A, Bunch MJ, Chiotha SS, Matthew R, Sanders BF, Hipel KW, vanLoon GW, Orbinski J. Complex adaptive systems-based framework for modeling the health impacts of climate change. THE JOURNAL OF CLIMATE CHANGE AND HEALTH 2024; 15:100292. [PMID: 38425789 PMCID: PMC10900873 DOI: 10.1016/j.joclim.2023.100292] [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: 05/25/2022] [Accepted: 12/01/2023] [Indexed: 03/02/2024]
Abstract
Introduction Climate change is a global phenomenon with far-reaching consequences, and its impact on human health is a growing concern. The intricate interplay of various factors makes it challenging to accurately predict and understand the implications of climate change on human well-being. Conventional methodologies have limitations in comprehensively addressing the complexity and nonlinearity inherent in the relationships between climate change and health outcomes. Objectives The primary objective of this paper is to develop a robust theoretical framework that can effectively analyze and interpret the intricate web of variables influencing the human health impacts of climate change. By doing so, we aim to overcome the limitations of conventional approaches and provide a more nuanced understanding of the complex relationships involved. Furthermore, we seek to explore practical applications of this theoretical framework to enhance our ability to predict, mitigate, and adapt to the diverse health challenges posed by a changing climate. Methods Addressing the challenges outlined in the objectives, this study introduces the Complex Adaptive Systems (CAS) framework, acknowledging its significance in capturing the nuanced dynamics of health effects linked to climate change. The research utilizes a blend of field observations, expert interviews, key informant interviews, and an extensive literature review to shape the development of the CAS framework. Results and discussion The proposed CAS framework categorizes findings into six key sub-systems: ecological services, extreme weather, infectious diseases, food security, disaster risk management, and clinical public health. The study employs agent-based modeling, using causal loop diagrams (CLDs) tailored for each CAS sub-system. A set of identified variables is incorporated into predictive modeling to enhance the understanding of health outcomes within the CAS framework. Through a combination of theoretical development and practical application, this paper aspires to contribute valuable insights to the interdisciplinary field of climate change and health. Integrating agent-based modeling and CLDs enhances the predictive capabilities required for effective health outcome analysis in the context of climate change. Conclusion This paper serves as a valuable resource for policymakers, researchers, and public health professionals by employing a CAS framework to understand and assess the complex network of health impacts associated with climate change. It offers insights into effective strategies for safeguarding human health amidst current and future climate challenges.
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Affiliation(s)
- Byomkesh Talukder
- Department of Global Health, Florida International University, USA
- Dahdaleh Institute for Global Health Research, York University, Canada
| | - Jochen E. Schubert
- Department of Civil and Environmental Engineering, University of California, Irvine, USA
| | - Mohammadali Tofighi
- Dahdaleh Institute for Global Health Research, York University, Canada
- ADERSIM & Disaster & Emergency Management, York University, Canada
| | - Patrick J. Likongwe
- Leadership for Environment and Development Southern and Eastern Africa (LEAD SEA), Malawi
| | - Eunice Y. Choi
- Dahdaleh Institute for Global Health Research, York University, Canada
| | - Gibson Y. Mphepo
- Leadership for Environment and Development Southern and Eastern Africa (LEAD SEA), Malawi
| | - Ali Asgary
- ADERSIM & Disaster & Emergency Management, York University, Canada
| | - Martin J. Bunch
- Faculty of Environmental and Urban Change, York University, Canada
| | - Sosten S. Chiotha
- Leadership for Environment and Development Southern and Eastern Africa (LEAD SEA), Malawi
| | - Richard Matthew
- Department of Urban Planning and Public Policy, University of California, Irvine, USA
| | - Brett F. Sanders
- Department of Civil and Environmental Engineering, University of California, Irvine, USA
- Department of Urban Planning and Public Policy, University of California, Irvine, USA
| | - Keith W. Hipel
- System Engineering Department, Waterloo University, Canada
| | - Gary W. vanLoon
- School of Environmental Studies, Queen's University, Kingston, Canada
| | - James Orbinski
- Dahdaleh Institute for Global Health Research, York University, Canada
- Faculty of Health, York University, Canada
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Esmaeili S, Mahmoudi A, Esmaeili P, Yousefi Ghalejoogh Z, Mordadi A, Ghasemi A, Mohammadi A, Bagheri A, Sohrabi A, Latifian M, Rajerison M, Pizarro-Cerda J, Mostafavi E. The surveillance of plague among rodents and dogs in Western Iran. PLoS Negl Trop Dis 2023; 17:e0011722. [PMID: 37948337 PMCID: PMC10637643 DOI: 10.1371/journal.pntd.0011722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 10/12/2023] [Indexed: 11/12/2023] Open
Abstract
BACKGROUND The causative agent of plague, Yersinia pestis, is maintained in nature via a flea-rodent cycle. Western Iran is an old focus for plague, and recent data indicate that rodents and dogs in this region have serological evidence of Y. pestis infection. The purpose of this study was to conduct a large-scale investigation of Y. pestis infection in shepherd dogs, rodents, and their fleas in old foci for plague in Western Iran. MATERIALS AND METHODS This study was conducted in Hamadan province from 2014 to 2020. Rodents and fleas were collected from various locations throughout this region. Y. pestis was investigated in rodent spleen samples and fleas using culture, serology, and real-time PCR methods. Additionally, sera samples were collected from carnivores and hares in this region, and the IgG antibody against the Y. pestis F1 antigen was assessed using an ELISA. RESULTS In this study, 927 rodents were captured, with Meriones spp. (91.8%) and Microtus qazvinensis (2.6%) being the most prevalent. A total of 6051 fleas were collected from rodents and carnivores, most of which were isolated from Meriones persicus. None of the rodents or fleas examined tested positive for Y. pestis using real-time PCR and culture methods. Meanwhile, IgG antibodies were detected in 0.32% of rodents. All serologically positive rodents belonged to M. persicus. Furthermore, none of the sera from the 138 carnivores (129 sheepdogs, five Vulpes vulpes, four Canis aureus), and nine hares tested positive in the ELISA test. CONCLUSION This primary survey of rodent reservoirs shows serological evidence of Y. pestis infection. Western Iran is an endemic plague focus, and as such, it requires ongoing surveillance.
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Affiliation(s)
- Saber Esmaeili
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Ahmad Mahmoudi
- Department of Biology, Faculty of Science, Urmia University, Iran
| | - Parisa Esmaeili
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Zohreh Yousefi Ghalejoogh
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Alireza Mordadi
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Ahmad Ghasemi
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Microbiology, Research Center of Reference Health Laboratories, Ministry of Health and Medical Education, Tehran, Iran
| | - Ali Mohammadi
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
- Department of Medical Entomology and Vector Control, School of Public Health and National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran
| | - Amin Bagheri
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Aria Sohrabi
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Mina Latifian
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Minoarisoa Rajerison
- Plague Unit, Central Laboratory for Plague, Institute Pasteur de Madagascar, Antananarivo, Madagascar
| | | | - Ehsan Mostafavi
- National Reference Laboratory for Plague, Tularemia and Q Fever, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar-Ahang, Hamadan, Iran
- Department of Epidemiology and Biostatics, Research Centre for Emerging and Reemerging Infectious Diseases, Pasteur Institute of Iran, Tehran, Iran
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Voinson M, Smadi C, Billiard S. How does the host community structure affect the epidemiological dynamics of emerging infectious diseases? Ecol Modell 2022. [DOI: 10.1016/j.ecolmodel.2022.110092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Rwezaura H, Diagne ML, Omame A, de Espindola AL, Tchuenche JM. Mathematical modeling and optimal control of SARS-CoV-2 and tuberculosis co-infection: a case study of Indonesia. MODELING EARTH SYSTEMS AND ENVIRONMENT 2022; 8:5493-5520. [PMID: 35814616 PMCID: PMC9251044 DOI: 10.1007/s40808-022-01430-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 05/16/2022] [Indexed: 01/08/2023]
Abstract
A new mathematical model incorporating epidemiological features of the co-dynamics of tuberculosis (TB) and SARS-CoV-2 is analyzed. Local asymptotic stability of the disease-free and endemic equilibria are shown for the sub-models when the respective reproduction numbers are below unity. Bifurcation analysis is carried out for the TB only sub-model, where it was shown that the sub-model undergoes forward bifurcation. The model is fitted to the cumulative confirmed daily SARS-CoV-2 cases for Indonesia from February 11, 2021 to August 26, 2021. The fitting was carried out using the fmincon optimization toolbox in MATLAB. Relevant parameters in the model are estimated from the fitting. The necessary conditions for the existence of optimal control and the optimality system for the co-infection model is established through the application of Pontryagin’s Principle. Different control strategies: face-mask usage and SARS-CoV-2 vaccination, TB prevention as well as treatment controls for both diseases are considered. Simulations results show that: (1) the strategy against incident SARS-CoV-2 infection averts about 27,878,840 new TB cases; (2) also, TB prevention and treatment controls could avert 5,397,795 new SARS-CoV-2 cases. (3) In addition, either SARS-CoV-2 or TB only control strategy greatly mitigates a significant number of new co-infection cases.
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Avila BW, Winkelman DL, Fetherman ER. Dual resistance to Flavobacterium psychrophilum and Myxobolus cerebralis in rainbow trout (Oncorhynchus mykiss, Walbaum). JOURNAL OF FISH DISEASES 2022; 45:801-813. [PMID: 35262925 PMCID: PMC9314901 DOI: 10.1111/jfd.13605] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/17/2022] [Accepted: 02/22/2022] [Indexed: 06/14/2023]
Abstract
Aquatic pathogens are a major concern for fish hatchery production, fisheries management, and conservation, and disease control needs to be addressed. Two important salmonid pathogens are Myxobolus cerebralis and Flavobacterium psychrophilum that cause whirling disease and bacterial coldwater disease (BCWD), respectively. Innate disease resistance is a potential option for reducing disease-related mortality in hatchery-reared rainbow trout (Oncorhynchus mykiss, Walbaum). Two experiments were conducted to assess pathogen resistance of first-generation (F1) rainbow trout created by crossing M. cerebralis- and F. psychrophilum-resistant strains. In the first experiment, we exposed two rainbow trout strains and one F1 cross to six treatments: control (no exposure), mock injection, F. psychrophilum only, M. cerebralis only, F. psychrophilum then M. cerebralis, and M. cerebralis then F. psychrophilum. Results indicated that the F1 cross was not resistant to either pathogen. In the second experiment, we exposed five rainbow trout strains and four rainbow trout crosses to F. psychrophilum. The second experiment indicated that at least one rainbow trout cross was F. psychrophilum-resistant. Achieving dual resistance may be possible using selective breeding but only some multigenerational strains are suitable candidates for further evaluation.
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Affiliation(s)
- Brian W. Avila
- Colorado Cooperative Fish and Wildlife Research UnitColorado State UniversityFort CollinsColoradoUSA
| | - Dana L. Winkelman
- U.S. Geological SurveyColorado Cooperative Fish and Wildlife Research UnitDepartment of Fish, Wildlife and Conservation BiologyColorado State UniversityFort CollinsColoradoUSA
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9
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Phytocompounds as an Alternative Antimicrobial Approach in Aquaculture. Antibiotics (Basel) 2022; 11:antibiotics11040469. [PMID: 35453220 PMCID: PMC9031819 DOI: 10.3390/antibiotics11040469] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 03/02/2022] [Accepted: 03/04/2022] [Indexed: 02/04/2023] Open
Abstract
Despite culturing the fastest-growing animal in animal husbandry, fish farmers are often adversely economically affected by pathogenic disease outbreaks across the world. Although there are available solutions such as the application of antibiotics to mitigate this phenomenon, the excessive and injudicious use of antibiotics has brought with it major concerns to the community at large, mainly due to the rapid development of resistant bacteria. At present, the use of natural compounds such as phytocompounds that can be an alternative to antibiotics is being explored to address the issue of antimicrobial resistance (AMR). These phytocompounds are bioactive agents that can be found in many species of plants and hold much potential. In this review, we will discuss phytocompounds extracted from plants that have been evidenced to contain antimicrobial, antifungal, antiviral and antiparasitic activities. Further, it has also been found that compounds such as terpenes, phenolics, saponins and alkaloids can be beneficial to the aquaculture industry when applied. This review will focus mainly on compounds that have been identified between 2000 and 2021. It is hoped this review will shed light on promising phytocompounds that can potentially and effectively mitigate AMR.
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10
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Manenti R, Mercurio S, Melotto A, Barzaghi B, Epis S, Tecilla M, Pennati R, Scarì GU, Ficetola GF. A New Disease Caused by an Unidentified Etiological Agent Affects European Salamanders. Animals (Basel) 2022; 12:ani12060696. [PMID: 35327092 PMCID: PMC8944795 DOI: 10.3390/ani12060696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/03/2022] [Accepted: 03/04/2022] [Indexed: 02/04/2023] Open
Abstract
New pathologies are causing dramatic declines and extinctions of multiple amphibian species. In 2013, in one fire salamander population of Northern Italy, we found individuals with undescribed cysts at the throat level, a malady whose existence has not previously been reported in amphibians. With the aim of describing this novel disease, we performed repeated field surveys to assess the frequency of affected salamanders from 2014 to 2020, and integrated morphological, histological, and molecular analyses to identify the pathogen. The novel disease affected up to 22% of salamanders of the study population and started spreading to nearby populations. Cysts are formed by mucus surrounding protist-like cells about 30 µm long, characterized by numerous cilia/undulipodia. Morphological and genetic analyses did not yield a clear match with described organisms. The existence of this pathogen calls for the implementation of biosecurity protocols and more studies on the dynamics of transmission and the impact on wild populations.
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Affiliation(s)
- Raoul Manenti
- Department of Environmental Science and Policy, University of Milano, 20133 Milano, Italy; (B.B.); (R.P.); (G.F.F.)
- Correspondence: (R.M.); (S.M.); Tel.: +39-3490733107 (R.M.)
| | - Silvia Mercurio
- Department of Environmental Science and Policy, University of Milano, 20133 Milano, Italy; (B.B.); (R.P.); (G.F.F.)
- Correspondence: (R.M.); (S.M.); Tel.: +39-3490733107 (R.M.)
| | - Andrea Melotto
- Centre of Excellence for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch 7602, South Africa;
| | - Benedetta Barzaghi
- Department of Environmental Science and Policy, University of Milano, 20133 Milano, Italy; (B.B.); (R.P.); (G.F.F.)
| | - Sara Epis
- Department of Biosciences, University of Milano, 20133 Milano, Italy; (S.E.); (M.T.); (G.U.S.)
| | - Marco Tecilla
- Department of Biosciences, University of Milano, 20133 Milano, Italy; (S.E.); (M.T.); (G.U.S.)
| | - Roberta Pennati
- Department of Environmental Science and Policy, University of Milano, 20133 Milano, Italy; (B.B.); (R.P.); (G.F.F.)
| | - Giorgio Ulisse Scarì
- Department of Biosciences, University of Milano, 20133 Milano, Italy; (S.E.); (M.T.); (G.U.S.)
| | - Gentile Francesco Ficetola
- Department of Environmental Science and Policy, University of Milano, 20133 Milano, Italy; (B.B.); (R.P.); (G.F.F.)
- Laboratoire d’Ecologie Alpine (LECA), University Grenoble Alpes, CNRS, 38400 Grenoble, France
- Laboratoire d’Ecologie Alpine (LECA), University Savoie Mont Blanc, CNRS, 38400 Grenoble, France
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11
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Bijma P, Hulst AD, de Jong MCM. The quantitative genetics of the prevalence of infectious diseases: hidden genetic variation due to indirect genetic effects dominates heritable variation and response to selection. Genetics 2022; 220:iyab141. [PMID: 34849837 PMCID: PMC8733421 DOI: 10.1093/genetics/iyab141] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 08/18/2021] [Indexed: 11/13/2022] Open
Abstract
Infectious diseases have profound effects on life, both in nature and agriculture. However, a quantitative genetic theory of the host population for the endemic prevalence of infectious diseases is almost entirely lacking. While several studies have demonstrated the relevance of transmission of infections for heritable variation and response to selection, current quantitative genetics ignores transmission. Thus, we lack concepts of breeding value and heritable variation for endemic prevalence, and poorly understand response of endemic prevalence to selection. Here, we integrate quantitative genetics and epidemiology, and propose a quantitative genetic theory for the basic reproduction number R0 and for the endemic prevalence of an infection. We first identify the genetic factors that determine the prevalence. Subsequently, we investigate the population-level consequences of individual genetic variation, for both R0 and the endemic prevalence. Next, we present expressions for the breeding value and heritable variation, for endemic prevalence and individual binary disease status, and show that these depend strongly on the prevalence. Results show that heritable variation for endemic prevalence is substantially greater than currently believed, and increases strongly when prevalence decreases, while heritability of disease status approaches zero. As a consequence, response of the endemic prevalence to selection for lower disease status accelerates considerably when prevalence decreases, in contrast to classical predictions. Finally, we show that most heritable variation for the endemic prevalence is hidden in indirect genetic effects, suggesting a key role for kin-group selection in the evolutionary history of current populations and for genetic improvement in animals and plants.
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Affiliation(s)
- Piter Bijma
- Animal Breeding and Genomics, Wageningen University and Research, Wageningen 6708 PB, The Netherlands
| | - Andries D Hulst
- Animal Breeding and Genomics, Wageningen University and Research, Wageningen 6708 PB, The Netherlands
- Quantitative Veterinary Epidemiology, Wageningen University and Research, Wageningen 6708 PB, The Netherlands
| | - Mart C M de Jong
- Quantitative Veterinary Epidemiology, Wageningen University and Research, Wageningen 6708 PB, The Netherlands
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12
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Abstract
Over the last few decades, hundreds of human pathogens have emerged at a rate unprecedented in human history. Emerged from where? Mostly from animals. The AIDS virus is blamed on the butchering of primates in the African bushmeat trade, we created mad cow disease when we turned cows into carnivores and cannibals, and SARS and COVID-19 have been traced back to the exotic wild animal trade. Our last pandemic, swine flu in 2009, arose not from some backwater wet market in Asia, however. It was largely made-in-the-USA on pig production operations in the United States. In this new Age of Emerging Diseases, there are now billions of animals overcrowded and intensively confined in filthy factory farms for viruses to incubate and mutate within. Today's industrial farming practices have given viruses billions more spins at pandemic roulette. How can we stop the emergence of pandemic viruses in the first place? Whenever possible, treat the cause. The largest and oldest association of public health professionals in the world, the American Public Health Association, has called for a moratorium on factory farming for nearly two decades. Indeed, factory farms are a public health menace. In addition to discontinuing the intensive confinement practices of animal agriculture, we should continue to research, develop, and invest in innovative plant-based and cultivated meat technologies to move away from raising billions of feathered and curly-tailed test tubes for viruses with pandemic potential to mutate within.
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13
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SARS-CoV-2: Cross-scale Insights from Ecology and Evolution. Trends Microbiol 2021; 29:593-605. [PMID: 33893024 PMCID: PMC7997387 DOI: 10.1016/j.tim.2021.03.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 12/19/2022]
Abstract
Ecological and evolutionary processes govern the fitness, propagation, and interactions of organisms through space and time, and viruses are no exception. While coronavirus disease 2019 (COVID-19) research has primarily emphasized virological, clinical, and epidemiological perspectives, crucial aspects of the pandemic are fundamentally ecological or evolutionary. Here, we highlight five conceptual domains of ecology and evolution – invasion, consumer-resource interactions, spatial ecology, diversity, and adaptation – that illuminate (sometimes unexpectedly) the emergence and spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We describe the applications of these concepts across levels of biological organization and spatial scales, including within individual hosts, host populations, and multispecies communities. Together, these perspectives illustrate the integrative power of ecological and evolutionary ideas and highlight the benefits of interdisciplinary thinking for understanding emerging viruses.
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14
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Bartlow AW, Machalaba C, Karesh WB, Fair JM. Biodiversity and Global Health: Intersection of Health, Security, and the Environment. Health Secur 2021; 19:214-222. [PMID: 33733864 DOI: 10.1089/hs.2020.0112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Andrew W Bartlow
- Andrew W. Bartlow, PhD, and Jeanne M. Fair, PhD, are Scientists; both in Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM. Catherine Machalaba, PhD, MPH, is Senior Policy Advisor and Senior Research Scientist and William B. Karesh, DVM, is Executive Vice President for Health and Policy; both at EcoHealth Alliance, New York, NY
| | - Catherine Machalaba
- Andrew W. Bartlow, PhD, and Jeanne M. Fair, PhD, are Scientists; both in Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM. Catherine Machalaba, PhD, MPH, is Senior Policy Advisor and Senior Research Scientist and William B. Karesh, DVM, is Executive Vice President for Health and Policy; both at EcoHealth Alliance, New York, NY
| | - William B Karesh
- Andrew W. Bartlow, PhD, and Jeanne M. Fair, PhD, are Scientists; both in Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM. Catherine Machalaba, PhD, MPH, is Senior Policy Advisor and Senior Research Scientist and William B. Karesh, DVM, is Executive Vice President for Health and Policy; both at EcoHealth Alliance, New York, NY
| | - Jeanne M Fair
- Andrew W. Bartlow, PhD, and Jeanne M. Fair, PhD, are Scientists; both in Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM. Catherine Machalaba, PhD, MPH, is Senior Policy Advisor and Senior Research Scientist and William B. Karesh, DVM, is Executive Vice President for Health and Policy; both at EcoHealth Alliance, New York, NY
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15
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Biodiversity loss and COVID-19 pandemic: The role of bats in the origin and the spreading of the disease. Biochem Biophys Res Commun 2021; 538:2-13. [PMID: 33092787 PMCID: PMC7566801 DOI: 10.1016/j.bbrc.2020.10.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 10/14/2020] [Indexed: 12/15/2022]
Abstract
The loss of biodiversity in the ecosystems has created the general conditions that have favored and, in fact, made possible, the insurgence of the COVID-19 pandemic. A lot of factors have contributed to it: deforestation, changes in forest habitats, poorly regulated agricultural surfaces, mismanaged urban growth. They have altered the composition of wildlife communities, greatly increased the contacts of humans with wildlife, and altered niches that harbor pathogens, increasing their chances to come in contact with humans. Among the wildlife, bats have adapted easily to anthropized environments such as houses, barns, cultivated fields, orchards, where they found the suitable ecosystem to prosper. Bats are major hosts for αCoV and βCoV: evolution has shaped their peculiar physiology and their immune system in a way that makes them resistant to viral pathogens that would instead successfully attack other species, including humans. In time, the coronaviruses that bats host as reservoirs have undergone recombination and other modifications that have increased their ability for inter-species transmission: one modification of particular importance has been the development of the ability to use ACE2 as a receptor in host cells. This particular development in CoVs has been responsible for the serious outbreaks in the last two decades, and for the present COVID-19 pandemic.
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16
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An overview of global epidemics and the challenges faced. LEVERAGING ARTIFICIAL INTELLIGENCE IN GLOBAL EPIDEMICS 2021. [PMCID: PMC8342595 DOI: 10.1016/b978-0-323-89777-8.00011-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In this chapter, the global epidemiological events causing infections that ravaged humanity throughout its existence by bringing hardship to rich and poor nations alike are aggregated and presented. Among these, the largest known epidemics including the recent COVID-19 pandemic will be highlighted along with the analysis of the actual and common reason behind the occurring of all the epidemic scenarios. The epidemiological and nonepidemiological impacts of the most fatal pandemics recorded in history are also discussed. The vulnerable countries’ readiness for coping with epidemics is assessed in terms of different indices. Furthermore, the current and future challenges in fighting epidemiological events are on the frontline and a number of preparative measures and strategies have been suggested.
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17
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Large-scale disease patterns explained by climatic seasonality and host traits. Oecologia 2020; 194:723-733. [DOI: 10.1007/s00442-020-04782-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 10/09/2020] [Indexed: 12/19/2022]
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18
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Ayala AJ, Yabsley MJ, Hernandez SM. A Review of Pathogen Transmission at the Backyard Chicken-Wild Bird Interface. Front Vet Sci 2020; 7:539925. [PMID: 33195512 PMCID: PMC7541960 DOI: 10.3389/fvets.2020.539925] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 08/13/2020] [Indexed: 01/31/2023] Open
Abstract
Habitat conversion and the expansion of domesticated, invasive species into native habitats are increasingly recognized as drivers of pathogen emergence at the agricultural-wildlife interface. Poultry agriculture is one of the largest subsets of this interface, and pathogen spillover events between backyard chickens and wild birds are becoming more commonly reported. Native wild bird species are under numerous anthropogenic pressures, but the risks of pathogen spillover from domestic chickens have been historically underappreciated as a threat to wild birds. Now that the backyard chicken industry is one of the fastest growing industries in the world, it is imperative that the principles of biosecurity, specifically bioexclusion and biocontainment, are legislated and implemented. We reviewed the literature on spillover events of pathogens historically associated with poultry into wild birds. We also reviewed the reasons for biosecurity failures in backyard flocks that lead to those spillover events and provide recommendations for current and future backyard flock owners.
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Affiliation(s)
- Andrea J. Ayala
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Michael J. Yabsley
- Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States
- Southeastern Cooperative Wildlife Disease Study, Athens, GA, United States
| | - Sonia M. Hernandez
- Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States
- Southeastern Cooperative Wildlife Disease Study, Athens, GA, United States
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19
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Priyadarsini SL, Suresh M, Huisingh D. What can we learn from previous pandemics to reduce the frequency of emerging infectious diseases like COVID-19? GLOBAL TRANSITIONS 2020; 2:202-220. [PMID: 32984800 PMCID: PMC7508551 DOI: 10.1016/j.glt.2020.09.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 08/09/2020] [Accepted: 09/14/2020] [Indexed: 05/09/2023]
Abstract
The global risks report of 2020 stated, climate-related issues dominate all of the top-five long-term critical global risks burning the planet and according to the report, "as existing health risks resurge and new ones emerge, humanity's past successes in overcoming health challenges are no guarantee of future results." Over the last few decades, the world has experienced several pandemic outbreaks of various pathogens and the frequency of the emergence of novel strains of infectious organisms has increased in recent decades. As per expert opinion, rapidly mutating viruses, emergence and re-emergence of epidemics with increasing frequencies, climate-sensitive vector-borne diseases are likely to be increasing over the years and the trends will continue and intensify. Susceptible disease hosts, anthropogenic activities and environmental changes contribute and trigger the 'adaptive evolution' of infectious agents to thrive and spread into different ecological niches and to adapt to new hosts. The overarching objective of this paper is to provide insight into the human actions which should be strictly regulated to help to sustain life on earth. To identify and categorize the triggering factors that contribute to disease ecology, especially repeated emergence of disease pandemics, a theory building approach, 'Total Interpretive Structural Modeling' (TISM) was used; also the tool, 'Impact Matrix Cross-Reference Multiplication Applied to a Classification' analysis (MICMAC) was applied to rank the risk factors based on their impacts on other factors and on the interdependence among them. This mathematical modeling tool clearly explains the strength, position and interconnectedness of each anthropogenic factor that contributes to the evolution of pathogens and to the frequent emergence of pandemics which needs to be addressed with immediate priority. As we are least prepared for another pandemic outbreak, significant policy attention must be focused on the causative factors to limit emerging outbreaks like COVID 19 in the future.
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Affiliation(s)
- S Lakshmi Priyadarsini
- Dept. of Zoology, Govt Victoria College, University of Calicut, Palakkad-678001, Kerala, India
| | - M Suresh
- Amrita School of Business, Amrita Vishwa Vidyapeetham, Coimbatore, India
| | - Donald Huisingh
- The Institute for a Secure and Sustainable Environment, The University of Tennessee, Knoxville, 37996, USA
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20
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Senapati A, Panday P, Samanta S, Chattopadhyay J. Disease control through removal of population using Z-control approach. PHYSICA A 2020; 548:123846. [PMID: 32292237 PMCID: PMC7127574 DOI: 10.1016/j.physa.2019.123846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 11/22/2019] [Indexed: 06/02/2023]
Abstract
Present study considers the situation where the removal of population is adopted as a prevention measure for isolating the susceptible population from an infected region to reduce the disease prevalence. To investigate the scenario, a dynamic error based method, Z-type control is applied in an SI type disease model with the aim of achieving a predetermined disease prevalence. The controlled system is designed by introducing a new compartment (the population in an infection-free region) in the uncontrolled system to capture the removal of susceptible population from the infected region to an infection free region. By performing numerical simulations, our study shows that using Z-control mechanism, the removal of susceptible to an infection free region can effectively achieve a predetermined disease prevalence. The removal rates required for achieving a specific reduction in infected population for different levels of disease endemicity are quantified. Furthermore, the global sensitivity analysis (PRCC) is also performed to have a more clear insights on the correlations of the control parameter with the model parameters.
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Affiliation(s)
- Abhishek Senapati
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B. T. Road, Kolkata 700108, India
| | - Pijush Panday
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B. T. Road, Kolkata 700108, India
| | - Sudip Samanta
- Department of Mathematics, Bankura University, Bankura, West Bengal, India
| | - Joydev Chattopadhyay
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B. T. Road, Kolkata 700108, India
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21
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Tepolt CK, Darling JA, Blakeslee AMH, Fowler AE, Torchin ME, Miller AW, Ruiz GM. Recent introductions reveal differential susceptibility to parasitism across an evolutionary mosaic. Evol Appl 2020; 13:545-558. [PMID: 32431735 PMCID: PMC7045710 DOI: 10.1111/eva.12865] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 08/09/2019] [Accepted: 08/14/2019] [Indexed: 12/26/2022] Open
Abstract
Parasitism can represent a potent agent of selection, and introduced parasites have the potential to substantially alter their new hosts' ecology and evolution. While significant impacts have been reported for parasites that switch to new host species, the effects of macroparasite introduction into naïve populations of host species with which they have evolved remain poorly understood. Here, we investigate how the estuarine white-fingered mud crab (Rhithropanopeus harrisii) has adapted to parasitism by an introduced rhizocephalan parasite (Loxothylacus panopaei) that castrates its host. While the host crab is native to much of the East and Gulf Coasts of North America, its parasite is native only to the southern end of this range. Fifty years ago, the parasite invaded the mid-Atlantic, gradually expanding through previously naïve host populations. Thus, different populations of the same host species have experienced different degrees of historical interaction (and thus potential evolutionary response time) with the parasite: long term, short term, and naïve. In nine estuaries across this range, we examined whether and how parasite prevalence and host susceptibility to parasitism differs depending on the length of the host's history with the parasite. In field surveys, we found that the parasite was significantly more prevalent in its introduced range (i.e., short-term interaction) than in its native range (long-term interaction), a result that was also supported by a meta-analysis of prevalence data covering the 50 years since its introduction. In controlled laboratory experiments, host susceptibility to parasitism was significantly higher in naïve hosts than in hosts from the parasite's native range, suggesting that host resistance to parasitism is under selection. These results suggest that differences in host-parasite historical interaction can alter the consequences of parasite introductions in host populations. As anthropogenically driven range shifts continue, disruptions of host-parasite evolutionary relationships may become an increasingly important driver of ecological and evolutionary change.
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Affiliation(s)
- Carolyn K. Tepolt
- Department of BiologyWoods Hole Oceanographic InstitutionWoods HoleMAUSA
- Smithsonian Environmental Research CenterEdgewaterMDUSA
| | - John A. Darling
- National Exposure Research LaboratoryUS Environmental Protection AgencyResearch Triangle ParkNCUSA
| | | | - Amy E. Fowler
- Department of Environmental Science and PolicyGeorge Mason UniversityFairfaxVAUSA
| | - Mark E. Torchin
- Smithsonian Tropical Research InstituteBalboaAnconRepublic of Panama
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22
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Muhammad I, Rahman N, Nayab GE, Niaz S, Shah M, Afridi SG, Khan H, Daglia M, Capanoglu E. The Molecular Docking of Flavonoids Isolated from Daucus carota as a Dual Inhibitor of MDM2 and MDMX. Recent Pat Anticancer Drug Discov 2020; 15:154-164. [PMID: 32101134 DOI: 10.2174/1574892815666200226112506] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/22/2020] [Accepted: 02/23/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Cancer is characterized by overexpression of p53 associated proteins, which down-regulate P53 signaling pathway. In cancer therapy, p53 activity can be restored by inhibiting the interaction of MDMX (2N0W) and MDM2 (4JGR) proteins with P53 protein. OBJECTIVE In the current, study in silico approaches were adapted to use a natural product as a source of cancer therapy. METHODS In the current study in silico approaches were adapted to use a natural product as a source of cancer therapy. For in silico studies, Chemdraw and Molecular Operating Environment were used for structure drawing and molecular docking, respectively. Flavonoids isolated from D. carota were docked with cancerous proteins. RESULT Based on the docking score analysis, we found that compound 7 was the potent inhibitor of both cancerous proteins and can be used as a potent molecule for inhibition of 2N0W and 4JGR interaction with p53. CONCLUSION Thus the compound 7 can be used for the revival of p53 signaling pathway function however, intensive in vitro and in vivo experiments are required to prove the in silico analysis.
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Affiliation(s)
- Ijaz Muhammad
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Noor Rahman
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Gul E Nayab
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Sadaf Niaz
- Department of Zoology, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Mohibullah Shah
- Department of Biochemistry, Bahauddin Zakariya University, Multan-66000, Pakistan
| | - Sahib G Afridi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Haroon Khan
- Department of Pharmacy, Abdul Wali Khan University Mardan, Mardan-23200, KP, Pakistan
| | - Maria Daglia
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy
| | - Esra Capanoglu
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey
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23
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Hoikkala V, Almeida GMF, Laanto E, Sundberg LR. Aquaculture as a source of empirical evidence for coevolution between CRISPR-Cas and phage. Philos Trans R Soc Lond B Biol Sci 2019; 374:20180100. [PMID: 30905289 PMCID: PMC6452259 DOI: 10.1098/rstb.2018.0100] [Citation(s) in RCA: 5] [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] [Accepted: 11/11/2018] [Indexed: 12/20/2022] Open
Abstract
So far, studies on the bacterial immune system CRISPR-Cas and its ecological and evolutionary effects have been largely limited to laboratory conditions. While providing crucial information on the constituents of CRISPR-Cas, such studies may overlook fundamental components that affect bacterial immunity in natural habitats. Translating laboratory-derived predictions to nature is not a trivial task, owing partly to the instability of natural communities and difficulties in repeated sampling. To this end, we review how aquaculture, the farming of fishes and other aquatic species, may provide suitable semi-natural laboratories for examining the role of CRISPR-Cas in phage/bacterium coevolution. Existing data from disease surveillance conducted in aquaculture, coupled with growing interest towards phage therapy, may have already resulted in large collections of bacterium and phage isolates. These data, combined with premeditated efforts, can provide empirical evidence on phage-bacterium dynamics such as the bacteriophage adherence to mucus hypothesis, phage life cycles and their relationship with CRISPR-Cas and other immune defences. Typing of CRISPR spacer content in pathogenic bacteria can also provide practical information on diversity and origin of isolates during outbreaks. In addition to providing information of CRISPR functionality and phage-bacterium dynamics, aquaculture systems can significantly impact perspectives on design of phage-based disease treatment at the current era of increasing antibiotic resistance. This article is part of a discussion meeting issue 'The ecology and evolution of prokaryotic CRISPR-Cas adaptive immune systems'.
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Affiliation(s)
| | | | | | - Lotta-Riina Sundberg
- Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science and Nanoscience Center, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
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24
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Sundberg LR, Karvonen A. Minor environmental concentrations of antibiotics can modify bacterial virulence in co-infection with a non-targeted parasite. Biol Lett 2018; 14:20180663. [PMID: 30958249 PMCID: PMC6303518 DOI: 10.1098/rsbl.2018.0663] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 11/22/2018] [Indexed: 12/17/2022] Open
Abstract
Leakage of medical residues into the environment can significantly impact natural communities. For example, antibiotic contamination from agriculture and aquaculture can directly influence targeted pathogens, but also other non-targeted taxa of commensals and parasites that regularly co-occur and co-infect the same host. Consequently, antibiotics could significantly alter interspecific interactions and epidemiology of the co-infecting parasite community. We studied how minor environmental concentrations of antibiotic affects the co-infection of two parasites, the bacterium Flavobacterium columnare and the fluke Diplostomum pseudospathaceum, in their fish host. We found that antibiotic in feed, and particularly the minute concentration in water, significantly decreased bacterial virulence and changed the infection success of the flukes. These effects depended on the level of antibiotic resistance of the bacterial strains. Antibiotic, however, did not compensate for the higher virulence of co-infections. Our results demonstrate that even very low environmental concentrations of antibiotic can influence ecology and epidemiology of diseases in co-infection with non-targeted parasites. Leakage of antibiotics into the environment may thus have more complex effects on disease ecology than previously anticipated.
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Affiliation(s)
- Lotta-Riina Sundberg
- Department of Biological and Environmental Science, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
- Centre of Excellence of Biological Interactions, Department of Biological and Environmental Science and Nanoscience Center, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
| | - Anssi Karvonen
- Department of Biological and Environmental Science, University of Jyvaskyla, PO Box 35, 40014 Jyvaskyla, Finland
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25
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Fluctuations in anthropogenic nighttime lights from satellite imagery for five cities in Niger and Nigeria. Sci Data 2018; 5:180256. [PMID: 30422123 PMCID: PMC6233255 DOI: 10.1038/sdata.2018.256] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 09/27/2018] [Indexed: 11/23/2022] Open
Abstract
Dynamic measures of human populations are critical for global health management but are often overlooked, largely because they are difficult to quantify. Measuring human population dynamics can be prohibitively expensive in under-resourced communities. Satellite imagery can provide measurements of human populations, past and present, to complement public health analyses and interventions. We used anthropogenic illumination from publicly accessible, serial satellite nighttime images as a quantifiable proxy for seasonal population variation in five urban areas in Niger and Nigeria. We identified population fluxes as the mechanistic driver of regional seasonal measles outbreaks. Our data showed 1) urban illumination fluctuated seasonally, 2) corresponding population fluctuations were sufficient to drive seasonal measles outbreaks, and 3) overlooking these fluctuations during vaccination activities resulted in below-target coverage levels, incapable of halting transmission of the virus. We designed immunization solutions capable of achieving above-target coverage of both resident and mobile populations. Here, we provide detailed data on brightness from 2000–2005 for 5 cities in Niger and Nigeria and detailed methodology for application to other populations.
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26
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Rossi G, Karki S, Smith RL, Brown WM, Ruiz MO. The spread of mosquito-borne viruses in modern times: A spatio-temporal analysis of dengue and chikungunya. Spat Spatiotemporal Epidemiol 2018; 26:113-125. [PMID: 30390927 DOI: 10.1016/j.sste.2018.06.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 01/12/2018] [Accepted: 06/08/2018] [Indexed: 01/06/2023]
Abstract
Since the 1970s, mosquito-borne pathogens have spread to previously disease-free areas, as well as causing increased illness in endemic areas. In particular, dengue and chikungunya viruses, transmitted primarily by Aedes aegypti and secondarily by Aedes albopictus mosquitoes, represent a threat for up to a third of the world population, and are a growing public health concern. In this study, we assess the spatial and temporal factors related to the occurrences of historic dengue and chikungunya outbreaks in 76 nations focused geographically on the Indian Ocean, with outbreak data from 1959 to 2009. First, we describe the historical spatial and temporal patterns of outbreaks of dengue and chikungunya in the focal nations. Second, we use a boosted regression tree approach to assess the statistical relationships of nations' concurrent outbreak occurrences and annual occurrences with their spatial proximity to prior infections and climatic and socio-economic characteristics. We demonstrate that higher population density and shorter distances among nations with outbreaks are the dominant factors that characterize both dengue and chikungunya outbreaks. In conclusion, our analysis provides crucial insights, which can be applied to improve nations' surveillance and preparedness for future vector-borne disease epidemics.
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Affiliation(s)
- Gianluigi Rossi
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 S Lincoln Ave, Urbana, IL 61802, USA.
| | - Surendra Karki
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 S Lincoln Ave, Urbana, IL 61802, USA
| | - Rebecca Lee Smith
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 S Lincoln Ave, Urbana, IL 61802, USA
| | - William Marshall Brown
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 S Lincoln Ave, Urbana, IL 61802, USA
| | - Marilyn O'Hara Ruiz
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 S Lincoln Ave, Urbana, IL 61802, USA
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27
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Russell RE, Katz RA, Richgels KLD, Walsh DP, Grant EHC. A Framework for Modeling Emerging Diseases to Inform Management. Emerg Infect Dis 2018; 23:1-6. [PMID: 27983501 PMCID: PMC5176225 DOI: 10.3201/eid2301.161452] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The rapid emergence and reemergence of zoonotic diseases requires the ability to rapidly evaluate and implement optimal management decisions. Actions to control or mitigate the effects of emerging pathogens are commonly delayed because of uncertainty in the estimates and the predicted outcomes of the control tactics. The development of models that describe the best-known information regarding the disease system at the early stages of disease emergence is an essential step for optimal decision-making. Models can predict the potential effects of the pathogen, provide guidance for assessing the likelihood of success of different proposed management actions, quantify the uncertainty surrounding the choice of the optimal decision, and highlight critical areas for immediate research. We demonstrate how to develop models that can be used as a part of a decision-making framework to determine the likelihood of success of different management actions given current knowledge.
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Lilley TM, Prokkola JM, Johnson JS, Rogers EJ, Gronsky S, Kurta A, Reeder DM, Field KA. Immune responses in hibernating little brown myotis ( Myotis lucifugus) with white-nose syndrome. Proc Biol Sci 2018; 284:rspb.2016.2232. [PMID: 28179513 DOI: 10.1098/rspb.2016.2232] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 01/13/2017] [Indexed: 12/30/2022] Open
Abstract
White-nose syndrome (WNS) is a fungal disease responsible for decimating many bat populations in North America. Pseudogymnoascus destructans (Pd), the psychrophilic fungus responsible for WNS, prospers in the winter habitat of many hibernating bat species. The immune response that Pd elicits in bats is not yet fully understood; antibodies are produced in response to infection by Pd, but they may not be protective and indeed may be harmful. To understand how bats respond to infection during hibernation, we studied the effect of Pd inoculation on the survival and gene expression of captive hibernating Myotis lucifugus with varying pre-hibernation antifungal antibody titres. We investigated gene expression through the transcription of selected cytokine genes (Il6, Il17a, Il1b, Il4 and Ifng) associated with inflammatory, Th1, Th2 and Th17 immune responses in wing tissue and lymph nodes. We found no difference in survival between bats with low and high anti-Pd titres, although anti-Pd antibody production during hibernation differed significantly between infected and uninfected bats. Transcription of Il6 and Il17a was higher in the lymph nodes of infected bats compared with uninfected bats. Increased transcription of these cytokines in the lymph node suggests that a pro-inflammatory immune response to WNS is not restricted to infected tissues and occurs during hibernation. The resulting Th17 response may be protective in euthermic bats, but because it may disrupt torpor, it could be detrimental during hibernation.
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Affiliation(s)
- T M Lilley
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA.,Biodiversity Unit, University of Turku, 20014 Turku, Finland
| | - J M Prokkola
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA
| | - J S Johnson
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA.,Center for Ecology and Evolutionary Studies, Department of Biological Sciences, Ohio University, Athens, OH 45701, USA
| | - E J Rogers
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA
| | - S Gronsky
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA
| | - A Kurta
- Biology Department, Eastern Michigan University, Ypsilanti, MI 48197, USA
| | - D M Reeder
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA
| | - K A Field
- Biology Department, Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA
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29
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Reynolds MG, Guagliardo SAJ, Nakazawa YJ, Doty JB, Mauldin MR. Understanding orthopoxvirus host range and evolution: from the enigmatic to the usual suspects. Curr Opin Virol 2018; 28:108-115. [PMID: 29288901 DOI: 10.1016/j.coviro.2017.11.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/20/2017] [Accepted: 11/21/2017] [Indexed: 11/16/2022]
Abstract
In general, orthopoxviruses can be considered as falling into one of three host-utilization categories: highly specialized, single-host; broad host range; or 'cryptic', the last encompassing those viruses about which very little is known. Single-host viruses tend to exploit abundant hosts that have consistent patterns of interaction. For these viruses, observed genome reduction and loss of presumptive host-range genes is thought to be a consequence of relaxed selection. In contrast, the large genome size retained among broad host range orthopoxviruses suggests these viruses may depend on multiple host species for persistence in nature. Our understanding of the ecologic requirements of orthopoxviruses is strongly influenced by geographic biases in data collection. This hinders our ability to predict potential sources for emergence of orthopoxvirus-associated infections.
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Affiliation(s)
- Mary G Reynolds
- United States Centers for Disease Control and Prevention, Division of High-Consequence Pathogens and Pathology, Poxvirus and Rabies Branch, 1600 Clifton Rd., NE Atlanta, GA 30333, USA.
| | - Sarah Anne J Guagliardo
- United States Centers for Disease Control and Prevention, Division of High-Consequence Pathogens and Pathology, Poxvirus and Rabies Branch, 1600 Clifton Rd., NE Atlanta, GA 30333, USA; United States Centers for Disease Control and Prevention, Epidemic Intelligence Service, 1600 Clifton Rd., NE Atlanta, GA 30333, USA
| | - Yoshinori J Nakazawa
- United States Centers for Disease Control and Prevention, Division of High-Consequence Pathogens and Pathology, Poxvirus and Rabies Branch, 1600 Clifton Rd., NE Atlanta, GA 30333, USA
| | - Jeffrey B Doty
- United States Centers for Disease Control and Prevention, Division of High-Consequence Pathogens and Pathology, Poxvirus and Rabies Branch, 1600 Clifton Rd., NE Atlanta, GA 30333, USA
| | - Matthew R Mauldin
- United States Centers for Disease Control and Prevention, Division of High-Consequence Pathogens and Pathology, Poxvirus and Rabies Branch, 1600 Clifton Rd., NE Atlanta, GA 30333, USA
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30
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de S Araújo GR, Souza WD, Frases S. The hidden pathogenic potential of environmental fungi. Future Microbiol 2017; 12:1533-1540. [PMID: 29168657 DOI: 10.2217/fmb-2017-0124] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Invasive fungal infections are a growing threat to immunocompromised patients, highlighting the importance of monitoring fungal pathogens. Global warming (including climatic oscillations) may select for environmental species that have acquired thermotolerance, a key step toward pathogenesis to humans. Also, important virulence factors have developed in environmental fungi, because they are essential for yeast survival in the environment. Thus, fungi traditionally regarded as nonpathogenic to humans have virulence factors similar to those of their pathogenic relatives. Here, we highlight the emergence of saprophytic environmental fungi - including species of Cryptococcus, Aspergillus, Penicillium, Candida and Scedosporium - as new human pathogens. Emerging pathogens are, in some cases, resistant to the available antifungals, potentiating the threat of novel fungal diseases.
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Affiliation(s)
- Glauber R de S Araújo
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Wanderley de Souza
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Susana Frases
- Laboratório de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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31
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Abstract
Arboviruses are emerging infectious diseases with the ability to expand geographically and rapidly affect large populations. The recent epidemic caused by the Zika virus in the Americas and congenital Zika syndrome associated with maternal infection has called out attention to the importance of studying arboviruses during pregnancy. This is a review on selected arboviruses infections during gestation, including Zika, Chikungunya, Dengue and Yellow Fever viruses. Issues such as historical overview, pathogenesis, transmission, clinical conditions, diagnosis, treatment and prevention are addressed.
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32
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Moury B, Fabre F, Hébrard E, Froissart R. Determinants of host species range in plant viruses. J Gen Virol 2017; 98:862-873. [PMID: 28475036 DOI: 10.1099/jgv.0.000742] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Prediction of pathogen emergence is an important field of research, both in human health and in agronomy. Most studies of pathogen emergence have focused on the ecological or anthropic factors involved rather than on the role of intrinsic pathogen properties. The capacity of pathogens to infect a large set of host species, i.e. to possess a large host range breadth (HRB), is tightly linked to their emergence propensity. Using an extensive plant virus database, we found that four traits related to virus genome or transmission properties were strongly and robustly linked to virus HRB. Broader host ranges were observed for viruses with single-stranded genomes, those with three genome segments and nematode-transmitted viruses. Also, two contrasted groups of seed-transmitted viruses were evidenced. Those with a single-stranded genome had larger HRB than non-seed-transmitted viruses, whereas those with a double-stranded genome (almost exclusively RNA) had an extremely small HRB. From the plant side, the family taxonomic rank appeared as a critical threshold for virus host range, with a highly significant increase in barriers to infection between plant families. Accordingly, the plant-virus infectivity matrix shows a dual structure pattern: a modular pattern mainly due to viruses specialized to infect plants of a given family and a nested pattern due to generalist viruses. These results contribute to a better prediction of virus host jumps and emergence risks.
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Affiliation(s)
- Benoît Moury
- Pathologie Végétale, INRA, 84140 Montfavet, France
| | - Frédéric Fabre
- UMR 1065, Santé et Agroécologie du Vignoble, INRA, Bordeaux Sciences Agro, Institut des Sciences de la Vigne et du Vin, F-33883 Villenave d'Ornon, France
| | - Eugénie Hébrard
- UMR186, IRD-Cirad-UM, Laboratory 'Interactions Plantes Microorganismes Environnement', Montpellier, France
| | - Rémy Froissart
- UMR5290, CNRS-IRD-UM1-UM2, Laboratory 'Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle', Montpellier, France.,UMR385, INRA-Cirad-SupAgro, Laboratory 'Biologie des Interactions Plantes-Parasites', Campus International de Baillarguet, F-34398 Montpellier, France
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33
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Kinnula H, Mappes J, Valkonen JK, Pulkkinen K, Sundberg L. Higher resource level promotes virulence in an environmentally transmitted bacterial fish pathogen. Evol Appl 2017; 10:462-470. [PMID: 28515779 PMCID: PMC5427672 DOI: 10.1111/eva.12466] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 01/30/2017] [Indexed: 01/08/2023] Open
Abstract
Diseases have become a primary constraint to sustainable aquaculture, but remarkably little attention has been paid to a broad class of pathogens: the opportunists. Opportunists often persist in the environment outside the host, and their pathogenic features are influenced by changes in the environment. To test how environmental nutrient levels influence virulence, we used strains of Flavobacterium columnare, an environmentally transmitted fish pathogen, to infect rainbow trout and zebra fish in two different nutrient concentrations. To separate the effects of dose and nutrients, we used three infective doses and studied the growth of bacteria in vitro. High nutrient concentration promoted both the virulence and the outside-host growth of the pathogen, most notably in a low-virulence strain. The increase in virulence could not be exhaustively explained by the increased dose under higher nutrient supply, suggesting virulence factor activation. In aquaculture settings, accumulation of organic material in rearing units can locally increase water nutrient concentration and therefore increase disease risk as a response to elevated bacterial density and virulence factor activation. Our results highlight the role of increased nutrients in outside-host environment as a selective agent for higher virulence and faster evolutionary rate in opportunistic pathogens.
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Affiliation(s)
- Hanna Kinnula
- Department of Biological and Environmental ScienceCentre of Excellence in Biological InteractionsUniversity of JyvaskylaJyvaskylaFinland
| | - Johanna Mappes
- Department of Biological and Environmental ScienceCentre of Excellence in Biological InteractionsUniversity of JyvaskylaJyvaskylaFinland
| | - Janne K. Valkonen
- Department of Biological and Environmental ScienceCentre of Excellence in Biological InteractionsUniversity of JyvaskylaJyvaskylaFinland
| | - Katja Pulkkinen
- Department of Biological and Environmental ScienceCentre of Excellence in Biological InteractionsUniversity of JyvaskylaJyvaskylaFinland
| | - Lotta‐Riina Sundberg
- Department of Biological and Environmental ScienceCentre of Excellence in Biological InteractionsUniversity of JyvaskylaJyvaskylaFinland
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34
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Boontop Y, Schutze MK, Clarke AR, Cameron SL, Krosch MN. Signatures of invasion: using an integrative approach to infer the spread of melon fly, Zeugodacus cucurbitae (Diptera: Tephritidae), across Southeast Asia and the West Pacific. Biol Invasions 2017. [DOI: 10.1007/s10530-017-1382-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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35
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Mayer SV, Tesh RB, Vasilakis N. The emergence of arthropod-borne viral diseases: A global prospective on dengue, chikungunya and zika fevers. Acta Trop 2017; 166:155-163. [PMID: 27876643 PMCID: PMC5203945 DOI: 10.1016/j.actatropica.2016.11.020] [Citation(s) in RCA: 256] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 10/27/2016] [Accepted: 11/16/2016] [Indexed: 01/02/2023]
Abstract
Arthropod-borne viruses (arboviruses) present a substantial threat to human and animal health worldwide. Arboviruses can cause a variety of clinical presentations that range from mild to life threatening symptoms. Many arboviruses are present in nature through two distinct cycles, the urban and sylvatic cycle that are maintained in complex biological cycles. In this review we briefly discuss the factors driving the emergence of arboviruses, such as the anthropogenic aspects of unrestrained human population growth, economic expansion and globalization. Also the important aspects of viruses and vectors in the occurrence of arboviruses epidemics. The focus of this review will be on dengue, zika and chikungunya viruses, particularly because these viruses are currently causing a negative impact on public health and economic damage around the world.
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Affiliation(s)
- Sandra V Mayer
- Department of Pathology, University of Texas Medical Branch (UTMB), Galveston, TX 77555-0609, USA
| | - Robert B Tesh
- Department of Pathology, University of Texas Medical Branch (UTMB), Galveston, TX 77555-0609, USA; Center for Biodefense and Emerging Infectious Diseases, UTMB, Galveston, USA; Center for Tropical Diseases, UTMB, Galveston, TX 77555-0609, USA; Institute for Human Infections and Immunity, UTMB, Galveston, TX 77555-0610, USA
| | - Nikos Vasilakis
- Department of Pathology, University of Texas Medical Branch (UTMB), Galveston, TX 77555-0609, USA; Center for Biodefense and Emerging Infectious Diseases, UTMB, Galveston, USA; Center for Tropical Diseases, UTMB, Galveston, TX 77555-0609, USA; Institute for Human Infections and Immunity, UTMB, Galveston, TX 77555-0610, USA.
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36
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Sundberg LR, Ketola T, Laanto E, Kinnula H, Bamford JKH, Penttinen R, Mappes J. Intensive aquaculture selects for increased virulence and interference competition in bacteria. Proc Biol Sci 2016; 283:20153069. [PMID: 26936249 DOI: 10.1098/rspb.2015.3069] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Although increased disease severity driven by intensive farming practices is problematic in food production, the role of evolutionary change in disease is not well understood in these environments. Experiments on parasite evolution are traditionally conducted using laboratory models, often unrelated to economically important systems. We compared how the virulence, growth and competitive ability of a globally important fish pathogen, Flavobacterium columnare, change under intensive aquaculture. We characterized bacterial isolates from disease outbreaks at fish farms during 2003-2010, and compared F. columnare populations in inlet water and outlet water of a fish farm during the 2010 outbreak. Our data suggest that the farming environment may select for bacterial strains that have high virulence at both long and short time scales, and it seems that these strains have also evolved increased ability for interference competition. Our results are consistent with the suggestion that selection pressures at fish farms can cause rapid changes in pathogen populations, which are likely to have long-lasting evolutionary effects on pathogen virulence. A better understanding of these evolutionary effects will be vital in prevention and control of disease outbreaks to secure food production.
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Affiliation(s)
- Lotta-Riina Sundberg
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Tarmo Ketola
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Elina Laanto
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Hanna Kinnula
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Jaana K H Bamford
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Reetta Penttinen
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
| | - Johanna Mappes
- University of Jyvaskyla, Centre of Excellence in Biological Interactions, Department of Biological and Environmental Science (and Nanoscience Centre), PO Box 35, Jyvaskyla 40014, Finland
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37
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Multilevel Models for the Distribution of Hosts and Symbionts. PLoS One 2016; 11:e0165768. [PMID: 27832124 PMCID: PMC5104364 DOI: 10.1371/journal.pone.0165768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 10/17/2016] [Indexed: 11/19/2022] Open
Abstract
Symbiont occurrence is influenced by host occurrence and vice versa, which leads to correlations in host-symbiont distributions at multiple levels. Interactions between co-infecting symbionts within host individuals can cause correlations in the abundance of two symbiont species across individual hosts. Similarly, interactions between symbiont transmission and host population dynamics can drive correlations between symbiont and host abundance across habitat patches. If ignored, these interactions can confound estimated responses of hosts and symbionts to other factors. Here, we present a general hierarchical modeling framework for distributions of hosts and symbionts, estimating correlations in host-symbiont distributions at the among-site, within-site, among-species, and among-individual levels. We present an empirical example from a multi-host multi-parasite system involving amphibians and their micro- and macroparasites. Amphibian hosts and their parasites were correlated at multiple levels of organization. Macroparasites often co-infected individual hosts, but rarely co-infected with the amphibian chytrid fungus. Such correlations may result from interactions among parasites and hosts, joint responses to environmental factors, or sampling bias. Joint host-symbiont models account for environmental constraints and species interactions while partitioning variance and dependence in abundance at multiple levels. This framework can be adapted to a wide variety of study systems and sampling designs.
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38
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Dalziel AE, Delean S, Heinrich S, Cassey P. Persistence of Low Pathogenic Influenza A Virus in Water: A Systematic Review and Quantitative Meta-Analysis. PLoS One 2016; 11:e0161929. [PMID: 27736884 PMCID: PMC5063340 DOI: 10.1371/journal.pone.0161929] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 08/15/2016] [Indexed: 11/21/2022] Open
Abstract
Avian influenza viruses are able to persist in the environment, in-between the transmission of the virus among its natural hosts. Quantifying the environmental factors that affect the persistence of avian influenza virus is important for influencing our ability to predict future outbreaks and target surveillance and control methods. We conducted a systematic review and quantitative meta-analysis of the environmental factors that affect the decay of low pathogenic avian influenza virus (LPAIV) in water. Abiotic factors affecting the persistence of LPAIV have been investigated for nearly 40 years, yet published data was produced by only 26 quantitative studies. These studies have been conducted by a small number of principal authors (n = 17) and have investigated a narrow range of environmental conditions, all of which were based in laboratories with limited reflection of natural conditions. The use of quantitative meta-analytic techniques provided the opportunity to assess persistence across a greater range of conditions than each individual study can achieve, through the estimation of mean effect-sizes and relationships among multiple variables. Temperature was the most influential variable, for both the strength and magnitude of the effect-size. Moderator variables explained a large proportion of the heterogeneity among effect-sizes. Salinity and pH were important factors, although future work is required to broaden the range of abiotic factors examined, as well as including further diurnal variation and greater environmental realism generally. We were unable to extract a quantitative effect-size estimate for approximately half (50.4%) of the reported experimental outcomes and we strongly recommend a minimum set of quantitative reporting to be included in all studies, which will allow robust assimilation and analysis of future findings. In addition we suggest possible means of increasing the applicability of future studies to the natural environment, and evaluating the biological content of natural waterbodies.
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Affiliation(s)
- Antonia E. Dalziel
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia
| | - Steven Delean
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia
| | - Sarah Heinrich
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia
| | - Phillip Cassey
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia
- Centre for Conservation Science & Technology, The University of Adelaide, Adelaide, South Australia
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39
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Meyer Steiger DB, Ritchie SA, Laurance SGW. Mosquito communities and disease risk influenced by land use change and seasonality in the Australian tropics. Parasit Vectors 2016; 9:387. [PMID: 27388293 PMCID: PMC4936001 DOI: 10.1186/s13071-016-1675-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 06/29/2016] [Indexed: 11/10/2022] Open
Abstract
Background Anthropogenic land use changes have contributed considerably to the rise of emerging and re-emerging mosquito-borne diseases. These diseases appear to be increasing as a result of the novel juxtapositions of habitats and species that can result in new interchanges of vectors, diseases and hosts. We studied whether the mosquito community structure varied between habitats and seasons and whether known disease vectors displayed habitat preferences in tropical Australia. Methods Using CDC model 512 traps, adult mosquitoes were sampled across an anthropogenic disturbance gradient of grassland, rainforest edge and rainforest interior habitats, in both the wet and dry seasons. Nonmetric multidimensional scaling (NMS) ordinations were applied to examine major gradients in the composition of mosquito and vector communities. Results We captured ~13,000 mosquitoes from 288 trap nights across four study sites. A community analysis identified 29 species from 7 genera. Even though mosquito abundance and richness were similar between the three habitats, the community composition varied significantly in response to habitat type. The mosquito community in rainforest interiors was distinctly different to the community in grasslands, whereas forest edges acted as an ecotone with shared communities from both forest interiors and grasslands. We found two community patterns that will influence disease risk at out study sites, first, that disease vectoring mosquito species occurred all year round. Secondly, that anthropogenic grasslands adjacent to rainforests may increase the probability of novel disease transmission through changes to the vector community on rainforest edges, as most disease transmitting species predominantly occurred in grasslands. Conclusion Our results indicate that the strong influence of anthropogenic land use change on mosquito communities could have potential implications for pathogen transmission to humans and wildlife. Electronic supplementary material The online version of this article (doi:10.1186/s13071-016-1675-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Dagmar B Meyer Steiger
- Centre for Tropical Environmental and Sustainability Studies (TESS) and College of Marine and Environmental Sciences, James Cook University, 4870, Cairns, Queensland, Australia.
| | - Scott A Ritchie
- School of Public Health, Tropical Medicine and Rehabilitative Sciences, James Cook University, 4870, Cairns, Queensland, Australia
| | - Susan G W Laurance
- Centre for Tropical Environmental and Sustainability Studies (TESS) and College of Marine and Environmental Sciences, James Cook University, 4870, Cairns, Queensland, Australia
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40
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Verma SK, Batra L, Tuteja U. A Recombinant Trivalent Fusion Protein F1-LcrV-HSP70(II) Augments Humoral and Cellular Immune Responses and Imparts Full Protection against Yersinia pestis. Front Microbiol 2016; 7:1053. [PMID: 27458447 PMCID: PMC4932849 DOI: 10.3389/fmicb.2016.01053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 06/23/2016] [Indexed: 11/21/2022] Open
Abstract
Plague is one of the most dangerous infections in humans caused by Yersinia pestis, a Gram-negative bacterium. Despite of an overwhelming research success, no ideal vaccine against plague is available yet. It is well established that F1/LcrV based vaccine requires a strong cellular immune response for complete protection against plague. In our earlier study, we demonstrated that HSP70(II) of Mycobacterium tuberculosis modulates the humoral and cellular immunity of F1/LcrV vaccine candidates individually as well as in combinations in a mouse model. Here, we made two recombinant constructs caf1–lcrV and caf1–lcrV–hsp70(II). The caf1 and lcrV genes of Y. pestis and hsp70 domain II of M. tuberculosis were amplified by polymerase chain reaction. Both the recombinant constructs caf1–lcrV and caf1–lcrV–hsp70(II) were cloned in pET28a vector and expressed in Escherichia coli. The recombinant fusion proteins F1–LcrV and F1–LcrV–HSP70(II) were purified using Ni-NTA columns and formulated with alum to evaluate the humoral and cell mediated immune responses in mice. The protective efficacies of F1–LcrV and F1–LcrV–HSP70(II) were determined following challenge of immunized mice with 100 LD50 of Y. pestis through intraperitoneal route. Significant differences were noticed in the titers of IgG and it’s isotypes, i.e., IgG1, IgG2b, and IgG3 in anti- F1–LcrV–HSP70(II) sera in comparison to anti-F1–LcrV sera. Similarly, significant differences were also noticed in the expression levels of IL-2, IFN-γ and TNF-α in splenocytes of F1–LcrV–HSP(II) immunized mice in comparison to F1–LcrV. Both F1–LcrV and F1–LcrV–HSP70(II) provided 100% protection. Our research findings suggest that F1–LcrV fused with HSP70 domain II of M. tuberculosis significantly enhanced the humoral and cellular immune responses in mouse model.
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Affiliation(s)
- Shailendra K Verma
- Microbiology Division, Defence Research & Development Establishment, Gwalior India
| | - Lalit Batra
- Microbiology Division, Defence Research & Development Establishment, Gwalior India
| | - Urmil Tuteja
- Microbiology Division, Defence Research & Development Establishment, Gwalior India
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41
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Pechous RD, Sivaraman V, Stasulli NM, Goldman WE. Pneumonic Plague: The Darker Side of Yersinia pestis. Trends Microbiol 2016; 24:190-197. [DOI: 10.1016/j.tim.2015.11.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 11/19/2015] [Accepted: 11/24/2015] [Indexed: 12/22/2022]
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42
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Johnson TL, Landguth EL, Stone EF. Modeling Relapsing Disease Dynamics in a Host-Vector Community. PLoS Negl Trop Dis 2016; 10:e0004428. [PMID: 26910884 PMCID: PMC4765964 DOI: 10.1371/journal.pntd.0004428] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/13/2016] [Indexed: 11/18/2022] Open
Abstract
Vector-borne diseases represent a threat to human and wildlife populations and mathematical models provide a means to understand and control epidemics involved in complex host-vector systems. The disease model studied here is a host-vector system with a relapsing class of host individuals, used to investigate tick-borne relapsing fever (TBRF). Equilibrium analysis is performed for models with increasing numbers of relapses and multiple hosts and the disease reproduction number, R0, is generalized to establish relationships with parameters that would result in the elimination of the disease. We show that host relapses in a single competent host-vector system is needed to maintain an endemic state. We show that the addition of an incompetent second host with no relapses increases the number of relapses needed for maintaining the pathogen in the first competent host system. Further, coupling of the system with hosts of differing competencies will always reduce R0, making it more difficult for the system to reach an endemic state. An important development in the study of infectious diseases is the application of mathematical models to understand the interplay between various factors that determine epidemiological processes. Vector-borne diseases are additionally complex with interactions between multiple host and vector species. Understanding the transmission dynamics of vector-borne diseases is an important step towards controlling outbreaks and mitigating human infection risk. Identifying the biotic and abiotic interactions and mechanisms that may contribute to disease emergence, establishment and persistence is necessary for assessing current and future disease risk, as well as developing effective control strategies. Tick-borne relapsing fever (TBRF) is found around the world and is caused by several species of Borrelia spirochetes, which are vectored by soft ticks of the genus Ornithodoros. TBRF is a cryptic disease that still causes significant morbidity and mortality, especially in some African countries. Here, we develop and adapt a compartmentalized mathematical model (SIR) with a relapsing component to investigate the dynamics of TBRF.
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Affiliation(s)
- Tammi L. Johnson
- Division of Biological Sciences, University of Montana, Missoula, Montana, United States of America
- * E-mail:
| | - Erin L. Landguth
- Division of Biological Sciences, University of Montana, Missoula, Montana, United States of America
| | - Emily F. Stone
- Department of Mathematical Sciences, University of Montana, Missoula, Montana, United States of America
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Evolutionary Medicine IV. Evolution and Emergence of Novel Pathogens. ENCYCLOPEDIA OF EVOLUTIONARY BIOLOGY 2016. [PMCID: PMC7149364 DOI: 10.1016/b978-0-12-800049-6.00293-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This article discusses how evolutionary and ecological factors interact to affect the epidemiology of emerging infectious diseases. It further explains how the nascent field of phylodynamics constructs mathematical models, which link evolution and epidemiology, to study pathogen transmission. To illustrate the importance of considering both evolution and ecology – along with the utility of the phylodynamic approach – when studying novel pathogens, the author considers examples from HIV, influenza, and Ebola.
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Abstract
Three major plague pandemics caused by the gram-negative bacterium Yersinia pestis have killed nearly 200 million people in human history. Due to its extreme virulence and the ease of its transmission, Y. pestis has been used purposefully for biowarfare in the past. Currently, plague epidemics are still breaking out sporadically in most of parts of the world, including the United States. Approximately 2000 cases of plague are reported each year to the World Health Organization. However, the potential use of the bacteria in modern times as an agent of bioterrorism and the emergence of a Y. pestis strain resistant to eight antibiotics bring out severe public health concerns. Therefore, prophylactic vaccination against this disease holds the brightest prospect for its long-term prevention. Here, we summarize the progress of the current vaccine development for counteracting plague.
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Affiliation(s)
- Wei Sun
- Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, 110880, Gainesville, FL, 32611-0880, USA.
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Disease Outbreaks: Critical Biological Factors and Control Strategies. URBAN RESILIENCE 2016. [PMCID: PMC7122892 DOI: 10.1007/978-3-319-39812-9_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Disease outbreaks remain a major threat to human health and welfare especially in urban areas in both developed and developing countries. A large body of theoretical work has been devoted to modeling disease emergence, and critical factors that predict outbreak occurrence and severity have been proposed. In this chapter, we focus on biological factors that underlie both theoretical models and urban planning. We describe the SARS 2002–2003 pandemic as a case study of epidemic control of a human infectious disease. We then describe theoretical analyses of disease dynamics and control strategies. An important conclusion is that epidemic control will be strongly dependent on particular aspects of pathogen biology including host breadth, virulence, incubation time, and/or mutation rate. The probability, and potential cost, of future outbreaks, may be high and lessons from both past cases and theoretical work should inform urban design and policy. Interdisciplinary collaboration in planning, swiftness of information dissemination and response, and willingness to forgo personal liberties during a crisis may be key factors in resilience to infectious disease outbreaks.
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Lindahl JF, Grace D. The consequences of human actions on risks for infectious diseases: a review. Infect Ecol Epidemiol 2015; 5:30048. [PMID: 26615822 PMCID: PMC4663196 DOI: 10.3402/iee.v5.30048] [Citation(s) in RCA: 129] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 10/22/2015] [Accepted: 10/27/2015] [Indexed: 01/19/2023] Open
Abstract
The human population is growing, requiring more space for food production, and needing more animals to feed it. Emerging infectious diseases are increasing, causing losses in both human and animal lives, as well as large costs to society. Many factors are contributing to disease emergence, including climate change, globalization and urbanization, and most of these factors are to some extent caused by humans. Pathogens may be more or less prone to emergence in themselves, and rapidly mutating viruses are more common among the emerging pathogens. The climate-sensitive vector-borne diseases are likely to be emerging due to climate changes and environmental changes, such as increased irrigation. This review lists the factors within pathogens that make them prone to emergence, and the modes of transmission that are affected. The anthropogenic changes contributing to disease emergence are described, as well as how they directly and indirectly cause either increased numbers of susceptible or exposed individuals, or cause increased infectivity. Many actions may have multiple direct or indirect effects, and it may be difficult to assess what the consequences may be. In addition, most anthropogenic drivers are related to desired activities, such as logging, irrigation, trade, and travelling, which the society is requiring. It is important to research more about the indirect and direct effects of the different actions to understand both the benefits and the risks.
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Affiliation(s)
- Johanna F Lindahl
- International Livestock Research Institute, Nairobi, Kenya.,Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden;
| | - Delia Grace
- International Livestock Research Institute, Nairobi, Kenya
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Rangel-Gamboa L, Martínez-Hernandez F, Maravilla P, Arenas-Guzmán R, Flisser A. Update of phylogenetic and genetic diversity of Sporothrix schenckii sensu lato. Med Mycol 2015; 54:248-55. [PMID: 26591010 DOI: 10.1093/mmy/myv096] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 10/05/2015] [Indexed: 11/14/2022] Open
Abstract
Sporothrix schenckii sensu lato causes subcutaneous mycosis. In this article we analysed its phylogeny and genetic diversity using calmodulin DNA sequences deposited in GenBank database. Population genetics indices were calculated, plus phylogenetic and haplotype network trees were built. Five clades with high values of posterior probability, 47 haplotypes and high diversity in the complex were found. Analysis of partial calmodulin sequences alignment revealed conserved and polymorphic regions that could be used as reference for taxonomic identification. The use of population genetics analysis allowed understanding the phylogenetic proximity of S. schenckii s. str. and S. brasiliensis; scarce genetic flow among them with low migration index and high ancestry coefficient was found. Similarly, S. globosa, S. mexicana and S. pallida sequences showed highly differentiated species with no genetic exchange. The phylogenetic tree suggests that S. mexicana shared a common ancestor with S. pallida; while S. globosa and S. brasiliensis are more related to S. schenckii s. str. and showed less haplotype diversity and restrictions in geographic distribution. In the haplotype network tree S. schenckii s. str. species displayed worldwide distribution without dispersion centres; while S. brasiliensis and S. globosa, exhibited Brazil and Euro-Asia as dispersion centres, respectively. Our data suggest that S. schenckii complex has been submitted to a divergent evolution process, probably due to the pressure of the environment and of the host. In contrast, S. brasiliensis could have been submitted to purifying selection or expansion process.
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Affiliation(s)
- Lucía Rangel-Gamboa
- Departamento de Ecologia de Agentes Patogenos, Subdireccion de Investigacion, Hospital General Dr. Manuel Gea Gonzalez. Distrito Federal, Mexico
| | - Fernando Martínez-Hernandez
- Departamento de Ecologia de Agentes Patogenos, Subdireccion de Investigacion, Hospital General Dr. Manuel Gea Gonzalez. Distrito Federal, Mexico
| | - Pablo Maravilla
- Departamento de Ecologia de Agentes Patogenos, Subdireccion de Investigacion, Hospital General Dr. Manuel Gea Gonzalez. Distrito Federal, Mexico
| | - Roberto Arenas-Guzmán
- Servicio de Micologia, Hospital General Dr. Manuel Gea Gonzalez. Distrito Federal, Mexico
| | - Ana Flisser
- Departamento de Microbiologia y Parasitologia, Facultad de Medicina, Universidad Nacional Autonoma de Mexico, Mexico 04510 Distrito Federal, Mexico.
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Guinet F, Avé P, Filali S, Huon C, Savin C, Huerre M, Fiette L, Carniel E. Dissociation of Tissue Destruction and Bacterial Expansion during Bubonic Plague. PLoS Pathog 2015; 11:e1005222. [PMID: 26484539 PMCID: PMC4615631 DOI: 10.1371/journal.ppat.1005222] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Accepted: 09/22/2015] [Indexed: 01/14/2023] Open
Abstract
Activation and/or recruitment of the host plasmin, a fibrinolytic enzyme also active on extracellular matrix components, is a common invasive strategy of bacterial pathogens. Yersinia pestis, the bubonic plague agent, expresses the multifunctional surface protease Pla, which activates plasmin and inactivates fibrinolysis inhibitors. Pla is encoded by the pPla plasmid. Following intradermal inoculation, Y. pestis has the capacity to multiply in and cause destruction of the lymph node (LN) draining the entry site. The closely related, pPla-negative, Y. pseudotuberculosis species lacks this capacity. We hypothesized that tissue damage and bacterial multiplication occurring in the LN during bubonic plague were linked and both driven by pPla. Using a set of pPla-positive and pPla-negative Y. pestis and Y. pseudotuberculosis strains in a mouse model of intradermal injection, we found that pPla is not required for bacterial translocation to the LN. We also observed that a pPla-cured Y. pestis caused the same extensive histological lesions as the wild type strain. Furthermore, the Y. pseudotuberculosis histological pattern, characterized by infectious foci limited by inflammatory cell infiltrates with normal tissue density and follicular organization, was unchanged after introduction of pPla. However, the presence of pPla enabled Y. pseudotuberculosis to increase its bacterial load up to that of Y. pestis. Similarly, lack of pPla strongly reduced Y. pestis titers in LNs of infected mice. This pPla-mediated enhancing effect on bacterial load was directly dependent on the proteolytic activity of Pla. Immunohistochemistry of Pla-negative Y. pestis-infected LNs revealed extensive bacterial lysis, unlike the numerous, apparently intact, microorganisms seen in wild type Y. pestis-infected preparations. Therefore, our study demonstrates that tissue destruction and bacterial survival/multiplication are dissociated in the bubo and that the primary action of Pla is to protect bacteria from destruction rather than to alter the tissue environment to favor Y. pestis propagation in the host. The hallmark of bubonic plague, a disease that ravaged Medieval Europe and is still prevalent in several countries, is the bubo, a highly inflammatory and painful lymph node, which is characterized by high concentrations of bacteria within a severely damaged organ. Yersinia pestis, the causative agent, expresses a surface protease, Pla, critical to the development of bubonic plague. This multitarget protease has the potential to activate the fibrinolytic pathway and to promote destruction of extracellular protein networks within tissues. Hence, it was expected that Pla was responsible for the tissue destructions of the bubo, and consequently, for bacterial propagation and virulence. However, we found, using various engineered Yersinia strains in a mouse model of bubonic plague, that Pla proteolytic activity was dispensable for lymph node alteration, but was required to achieve high bacterial loads in the organ. Further analysis showed that Pla is essential for preventing the bacteria from being destroyed in the host. Therefore, the role of Pla as a virulence factor is to protect Y. pestis survival and integrity in the host, rather than to assist its spread through tissue destruction.
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Affiliation(s)
- Françoise Guinet
- Unité de Recherche Yersinia, Institut Pasteur, Paris, France
- * E-mail: (FG); (EC)
| | - Patrick Avé
- Unité d’Histopathologie Humaine et Modèles Animaux, Institut Pasteur, Paris, France
| | - Sofia Filali
- Unité de Recherche Yersinia, Institut Pasteur, Paris, France
| | - Christèle Huon
- Unité de Recherche Yersinia, Institut Pasteur, Paris, France
| | - Cyril Savin
- Unité de Recherche Yersinia, Institut Pasteur, Paris, France
| | - Michel Huerre
- Unité de Recherche et d’Expertise d’Histotechnologie et Pathologie, Institut Pasteur, Paris, France
| | - Laurence Fiette
- Unité d’Histopathologie Humaine et Modèles Animaux, Institut Pasteur, Paris, France
| | - Elisabeth Carniel
- Unité de Recherche Yersinia, Institut Pasteur, Paris, France
- * E-mail: (FG); (EC)
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Derbise A, Hanada Y, Khalifé M, Carniel E, Demeure CE. Complete Protection against Pneumonic and Bubonic Plague after a Single Oral Vaccination. PLoS Negl Trop Dis 2015; 9:e0004162. [PMID: 26473734 PMCID: PMC4608741 DOI: 10.1371/journal.pntd.0004162] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 09/22/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND No efficient vaccine against plague is currently available. We previously showed that a genetically attenuated Yersinia pseudotuberculosis producing the Yersinia pestis F1 antigen was an efficient live oral vaccine against pneumonic plague. This candidate vaccine however failed to confer full protection against bubonic plague and did not produce F1 stably. METHODOLOGY/PRINCIPAL FINDINGS The caf operon encoding F1 was inserted into the chromosome of a genetically attenuated Y. pseudotuberculosis, yielding the VTnF1 strain, which stably produced the F1 capsule. Given orally to mice, VTnF1 persisted two weeks in the mouse gut and induced a high humoral response targeting both F1 and other Y. pestis antigens. The strong cellular response elicited was directed mostly against targets other than F1, but also against F1. It involved cells with a Th1-Th17 effector profile, producing IFNγ, IL-17, and IL-10. A single oral dose (108 CFU) of VTnF1 conferred 100% protection against pneumonic plague using a high-dose challenge (3,300 LD50) caused by the fully virulent Y. pestis CO92. Moreover, vaccination protected 100% of mice from bubonic plague caused by a challenge with 100 LD50 Y. pestis and 93% against a high-dose infection (10,000 LD50). Protection involved fast-acting mechanisms controlling Y. pestis spread out of the injection site, and the protection provided was long-lasting, with 93% and 50% of mice surviving bubonic and pneumonic plague respectively, six months after vaccination. Vaccinated mice also survived bubonic and pneumonic plague caused by a high-dose of non-encapsulated (F1-) Y. pestis. SIGNIFICANCE VTnF1 is an easy-to-produce, genetically stable plague vaccine candidate, providing a highly efficient and long-lasting protection against both bubonic and pneumonic plague caused by wild type or un-encapsulated (F1-negative) Y. pestis. To our knowledge, VTnF1 is the only plague vaccine ever reported that could provide high and durable protection against the two forms of plague after a single oral administration.
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Affiliation(s)
- Anne Derbise
- Unité de recherche Yersinia, Institut Pasteur, Paris, France
| | - Yuri Hanada
- Unité de recherche Yersinia, Institut Pasteur, Paris, France
| | - Manal Khalifé
- Unité de recherche Yersinia, Institut Pasteur, Paris, France
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Abstract
There has been an increase in the emergence and reemergence of human infectious diseases on a global scale, and zoonotic diseases in which wildlife serves as the reservoir are a large contributing factor. Faced with this situation, there is a necessity to create integrated prevention strategies and predictive models to determine the sites most vulnerable to the emergence of new zoonoses. Cases have been documented in which pathogens responsible for infectious diseases in wild species have been readily transmitted between hosts and have threatened vulnerable declining populations. Habitat destruction and man-made changes in the landscape together with the introduction of alien species are significant environmental variables that affect the ecology of infectious diseases. Thus, the loss of biodiversity is illustrated to be related to both the emergence of new or the exacerbation of existing vector-borne zoonotic diseases through mechanisms such as the loss of the dilution effect and ecological release and simplification. Hence, it is important to consider this factor when assessing disease risk and disease prevention in domestic animals and humans. Diseases like leptospirosis in which water plays an important role are ecosystem health diseases; in fact, the reported higher prevalence of Leptospira spp. in river otters in southern Chile compared with species less adapted to aquatic environments and with terrestrial domestic carnivores provides evidence that man-made landscape alterations, including the introduction of alien species, has exacerbated the transmission and prevalence of leptospirosis in wildlife and thus the risk of human infection.
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