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Mahdiabadi S, Rezaei N. Anaphylaxis and allergic reactions to COVID-19 vaccines: A narrative review of characteristics and potential obstacles on achieving herd immunity. Health Sci Rep 2022; 5:e787. [PMID: 36032518 PMCID: PMC9401640 DOI: 10.1002/hsr2.787] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/29/2022] [Accepted: 08/01/2022] [Indexed: 12/24/2022] Open
Abstract
Background and Aims Coronavirus disease 2019 (COVID-19) is a highly contagious infection, and new variants of its causative virus continue to emerge all around the world. Meanwhile, mass vaccination represents a highly effective measure to reduce the disease burden. Not only do vaccines immunize individuals, but they also protect the entire population through achieving herd immunity. They are composed of various ingredients, some of which may induce hypersensitivity reactions, namely anaphylaxis and cutaneous allergic reactions. This review aims to provide an explicit overview of the pathophysiology, suspected responsible components, and management of COVID-19 vaccine-induced allergic reactions, and their effect on acquiring herd immunity. Methods To perform this narrative review, a comprehensive literature search based on our selected terms was conducted in online databases of PubMed/Medline and Google Scholar for finding the relevant studies published from 2019 to 2022. Results COVID-19 vaccines introduce several advantages that outweigh their potential risks, such as allergic reactions. Allergic reactions are mainly attributed to polyethylene glycol and polysorbate excipients that can provoke IgE-mediated reactions and hypersensitivity reactions. These reactions should be managed properly to avoid having serious sequelae. Conclusion It is of great importance to immediately recognize and manage vaccine hypersensitivity reactions, especially anaphylaxis, to avoid allergic patients being excluded from the vaccination program, and more importantly, to stop the spreading of unfounded vaccine hesitancy leading to delayed herd immunity.
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Affiliation(s)
- Sara Mahdiabadi
- School of MedicineTehran University of Medical SciencesTehranIran
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Children's Medical CenterTehranIran
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical CenterTehran University of Medical SciencesTehranIran
| | - Nima Rezaei
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Children's Medical CenterTehranIran
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical CenterTehran University of Medical SciencesTehranIran
- Department of Immunology, School of MedicineTehran University of Medical SciencesTehranIran
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2
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Herd immunity under individual variation and reinfection. J Math Biol 2022; 85:2. [PMID: 35773525 PMCID: PMC9246817 DOI: 10.1007/s00285-022-01771-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 05/09/2022] [Accepted: 06/10/2022] [Indexed: 11/04/2022]
Abstract
We study a susceptible-exposed-infected-recovered (SEIR) model considered by Aguas et al. (In: Herd immunity thresholds for SARS-CoV-2 estimated from unfolding epidemics, 2021), Gomes et al. (In: J Theor Biol. 540:111063, 2022) where individuals are assumed to differ in their susceptibility or exposure to infection. Under this heterogeneity assumption, epidemic growth is effectively suppressed when the percentage of the population having acquired immunity surpasses a critical level - the herd immunity threshold - that is lower than in homogeneous populations. We derive explicit formulas to calculate herd immunity thresholds and stable configurations, especially when susceptibility or exposure are gamma distributed, and explore extensions of the model.
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3
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Gomes MGM, Ferreira MU, Corder RM, King JG, Souto-Maior C, Penha-Gonçalves C, Gonçalves G, Chikina M, Pegden W, Aguas R. Individual variation in susceptibility or exposure to SARS-CoV-2 lowers the herd immunity threshold. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2022:2020.04.27.20081893. [PMID: 32511451 PMCID: PMC7239079 DOI: 10.1101/2020.04.27.20081893] [Citation(s) in RCA: 128] [Impact Index Per Article: 64.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Individual variation in susceptibility and exposure is subject to selection by natural infection, accelerating the acquisition of immunity, and reducing herd immunity thresholds and epidemic final sizes. This is a manifestation of a wider population phenomenon known as "frailty variation". Despite theoretical understanding, public health policies continue to be guided by mathematical models that leave out considerable variation and as a result inflate projected disease burdens and overestimate the impact of interventions. Here we focus on trajectories of the coronavirus disease (COVID-19) pandemic in England and Scotland until November 2021. We fit models to series of daily deaths and infer relevant epidemiological parameters, including coefficients of variation and effects of non-pharmaceutical interventions which we find in agreement with independent empirical estimates based on contact surveys. Our estimates are robust to whether the analysed data series encompass one or two pandemic waves and enable projections compatible with subsequent dynamics. We conclude that vaccination programmes may have contributed modestly to the acquisition of herd immunity in populations with high levels of pre-existing naturally acquired immunity, while being critical to protect vulnerable individuals from severe outcomes as the virus becomes endemic.
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Affiliation(s)
- M Gabriela M Gomes
- Department of Mathematics and Statistics, University of Strathclyde, Glasgow, UK
- Centro de Matemática e Aplicações, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Marcelo U Ferreira
- Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
- Global Health and Tropical Medicine, Institute of Hygiene and Tropical Medicine, Nova University of Lisbon, Lisbon, Portugal
| | - Rodrigo M Corder
- Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Jessica G King
- Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
| | - Caetano Souto-Maior
- Laboratory of Systems Genetics, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | | | - Guilherme Gonçalves
- Unidade Multidisciplinar de Investigação Biomédica, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
| | - Maria Chikina
- Department of Computational and Systems Biology, University of Pittsburgh, Pittburgh, PA, USA
| | - Wesley Pegden
- Department of Mathematical Sciences, Carnegie Mellon University, , Pittburgh" , PA, USA
| | - Ricardo Aguas
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
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4
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Caleb S, Thompson D, Haimowitz R, Ciotoli C, Dannenbaum M, Fu LY. How colleges intervene to increase student body vaccination coverage. JOURNAL OF AMERICAN COLLEGE HEALTH : J OF ACH 2022; 70:428-435. [PMID: 32407196 DOI: 10.1080/07448481.2020.1752698] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/12/2020] [Accepted: 03/29/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVE The interventions colleges use to help students be compliant with vaccinations is unknown. This study describes colleges' use of practices consistent with Centers for Disease Control and Prevention (CDC) recommendations to encourage student body vaccination. PARTICIPANTS Participants were a convenience sample of 136 student health center (SHC) administrators from colleges across the U.S. METHODS An online survey assessed SHCs' use of various practices, policies and services to improve student body vaccination coverage. RESULTS There was wide variability in use of evidence-based interventions overall and with respect to specific vaccinations. While most SHCs (92.7%) coordinated vaccination outreach events on campus, only half (50%) accessed an immunization registry to verify vaccination histories. While 88.6% requested student vaccination histories for MMR, only 39.7% requested it for human papillomavirus (HPV). CONCLUSIONS The discrepancies in SHC implementation of interventions to increase coverage of the recommended vaccinations for students suggest that helping colleges expand their capacity to intervene may decrease coverage rate disparities.
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Affiliation(s)
- Susan Caleb
- Children's National Hospital, Washington, DC, USA
| | | | | | - Carlo Ciotoli
- Department of Medicine, New York University, New York, NY, USA
| | - Martha Dannenbaum
- Department of Student Health Services, Texas A&M University, College Station, Texas, USA
| | - Linda Y Fu
- Children's National Hospital, Washington, DC, USA
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5
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Schneider KE, Dayton L, Rouhani S, Latkin CA. Implications of attitudes and beliefs about COVID-19 vaccines for vaccination campaigns in the United States: A latent class analysis. Prev Med Rep 2021; 24:101584. [PMID: 34631397 PMCID: PMC8493734 DOI: 10.1016/j.pmedr.2021.101584] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 09/28/2021] [Accepted: 10/03/2021] [Indexed: 11/25/2022] Open
Abstract
Unprecedented global efforts in vaccine development have resulted in effective vaccines for COVID-19. The pandemic response in the US has been highly politicized, resulting in significant opposition to public health efforts, including vaccines. We aimed to understand patterns of attitudes and beliefs about the COVID-19 vaccine to inform vaccination campaigns. 583 English speaking United States adults were surveyed November 18-29, 2020. Participants answered 11 questions about their attitudes and beliefs about a COVID-19 vaccine, including perceived vaccine effectiveness, likelihood of getting vaccinated, and concerns that vaccine development was rushed/influenced by politics. We conducted a latent class analysis to identify profiles of attitudes/beliefs about a COVID-19 vaccine. We identified four classes of COVID-19 vaccine beliefs. The pro-vaccine class (28.8%) was willing to get vaccinated and had broadly positive beliefs about the vaccine. The development concerns class (27.8%) was willing to get vaccinated but was concerned about the development process. The third class (22.6%) was largely unsure if they would get vaccinated and if their peer groups would be vaccinated. The forth class (anti-vaccine, 20.8%) was dominated by an unwillingness to get vaccinated, vaccine distrust, vaccine development concerns, and peers groups with negative vaccine intentions. Given the large proportion of individuals who were concerned about the COVID-19 vaccine development process, messaging about rigor and approval processes may be critical to securing this group's commitment to vaccination. Having scientific and cultural leaders endorse vaccination may also be influential.
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Affiliation(s)
- Kristin E. Schneider
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, 624 N. Broadway, Baltimore, MD 21205, USA
| | - Lauren Dayton
- Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, 624 N. Broadway, Baltimore, MD 21205, USA
| | - Saba Rouhani
- Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, 624 N. Broadway, Baltimore, MD 21205, USA
| | - Carl A. Latkin
- Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, 624 N. Broadway, Baltimore, MD 21205, USA
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6
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Annas S, Zamri-Saad M. Intranasal Vaccination Strategy to Control the COVID-19 Pandemic from a Veterinary Medicine Perspective. Animals (Basel) 2021; 11:ani11071876. [PMID: 34202429 PMCID: PMC8300178 DOI: 10.3390/ani11071876] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/16/2021] [Accepted: 06/21/2021] [Indexed: 12/14/2022] Open
Abstract
Simple Summary Intranasal vaccination is one of the methods used to stimulate mucosal immunity. It has been widely practised to control many human and animal respiratory diseases. Coronavirus disease 2019 (COVID-19) is a highly contagious respiratory disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which resulted in a global pandemic. COVID-19 has reminded some veterinarians of various contagious veterinary diseases, including coronavirus infections in animals. This article discusses the control of highly contagious diseases of veterinary importance with emphasis on an intranasal vaccination approach, and the potential of implementing similar strategies in human medicine to control the ongoing COVID-19 pandemic. Abstract The world is currently facing an ongoing coronavirus disease 2019 (COVID-19) pandemic. The disease is a highly contagious respiratory disease which is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Current control measures used by many countries include social distancing, wearing face masks, frequent hand washing, self-isolation, and vaccination. The current commercially available vaccines are injectable vaccines, although a few intranasal vaccines are in trial stages. The reported side effects of COVID-19 vaccines, perceptions towards the safety of the vaccines, and frequent mutation of the virus may lead to poor herd immunity. In veterinary medicine, attaining herd immunity is one of the main considerations in disease control, and herd immunity depends on the use of efficacious vaccines and the vaccination coverage in a population. Hence, many aerosol or intranasal vaccines have been developed to control veterinary respiratory diseases such as Newcastle disease, rinderpest, infectious bronchitis, and haemorrhagic septicaemia. Different vaccine technologies could be employed to improve vaccination coverage, including the usage of an intranasal live recombinant vaccine or live mutant vaccine. This paper discusses the potential use of intranasal vaccination strategies against human COVID-19, based on a veterinary intranasal vaccine strategy.
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Clemente-Suárez VJ, Hormeño-Holgado A, Jiménez M, Benitez-Agudelo JC, Navarro-Jiménez E, Perez-Palencia N, Maestre-Serrano R, Laborde-Cárdenas CC, Tornero-Aguilera JF. Dynamics of Population Immunity Due to the Herd Effect in the COVID-19 Pandemic. Vaccines (Basel) 2020; 8:E236. [PMID: 32438622 PMCID: PMC7349986 DOI: 10.3390/vaccines8020236] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/14/2020] [Accepted: 05/15/2020] [Indexed: 02/07/2023] Open
Abstract
The novel Coronavirus 2 Severe Acute Respiratory Syndrome (SARS-Cov-2) has led to the Coronavirus Disease 2019 (COVID-19) pandemic, which has surprised health authorities around the world, quickly producing a global health crisis. Different actions to cope with this situation are being developed, including confinement, different treatments to improve symptoms, and the creation of the first vaccines. In epidemiology, herd immunity is presented as an area that could also solve this new global threat. In this review, we present the basis of herd immunology, the dynamics of infection transmission that induces specific immunity, and how the application of immunoepidemiology and herd immunology could be used to control the actual COVID-19 pandemic, along with a discussion of its effectiveness, limitations, and applications.
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Affiliation(s)
- Vicente Javier Clemente-Suárez
- Faculty of Sports Sciences, Universidad Europea de Madrid, 28670 Madrid, Spain;
- Grupo de Investigación en Cultura, Educación y Sociedad, Universidad de la Costa, Barranquilla 080002, Colombia
- Studies Centre in Applied Combat (CESCA), Toledo 45007, Spain;
| | | | - Manuel Jiménez
- Departamento de Didáctica de la Educación Física y Salud, Universidad Internacional de La Rioja, Logroño 26006, Spain;
| | | | - Eduardo Navarro-Jiménez
- Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla 080005, Colombia; (E.N.-J.); (R.M.-S.)
| | | | - Ronald Maestre-Serrano
- Facultad de Ciencias de la Salud, Universidad Simón Bolívar, Barranquilla 080005, Colombia; (E.N.-J.); (R.M.-S.)
| | | | - Jose Francisco Tornero-Aguilera
- Faculty of Sports Sciences, Universidad Europea de Madrid, 28670 Madrid, Spain;
- Studies Centre in Applied Combat (CESCA), Toledo 45007, Spain;
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8
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Exploring indirect protection associated with influenza immunization - A systematic review of the literature. Vaccine 2019; 37:7213-7232. [PMID: 31648907 DOI: 10.1016/j.vaccine.2019.09.086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 09/25/2019] [Accepted: 09/26/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Influenza causes significant annual morbidity and mortality, particularly in older adults, for whom influenza vaccine effectiveness (VE) is also lower. Immunizing one group (e.g., children) against influenza may indirectly protect another group (e.g., older adults) against influenza and its complications. METHODS We updated previous systematic reviews on indirect protection against influenza by searching MEDLINE and EMBASE for relevant human studies published until January 4, 2017. We abstracted and critically appraised English language publications that reported or provided information to calculate indirect VE against influenza, as a percentage, in non-institutional settings. We developed a term called 'estimated actual protection' to explore the relationship between indirect protection and the product of direct VE and relative vaccine coverage. We calculated estimated actual protection for a subset of studies that reported coverage and indirect VE for: laboratory-confirmed influenza; outpatient care for respiratory illness; influenza-associated emergency visits; or influenza-associated hospitalizations. We ran linear mixed models to compare estimated actual protection against indirect VE for the four outcomes, and graphed the data. RESULTS Of 2320 unique records identified, we abstracted and appraised 26 articles describing 24 studies. The majority of included studies reported at least one outcome suggesting that immunizing one group reduced influenza-related outcomes in another group. Critical appraisal of the abstracted studies identified recurring methodological weaknesses, such as lack of laboratory-confirmed influenza. Our exploratory analyses of 18 studies indicated a positive but not statistically significant relationship between estimated actual protection and indirect protection for each of the four outcomes. CONCLUSIONS Our systematic review and exploratory analyses suggest influenza immunization provides some level of indirect protection. However, our critical appraisal highlights the need for a standardized and consistently applied approach to measuring indirect protection against influenza to fill existing knowledge gaps. Additionally, the concept of estimated actual protection requires validation.
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9
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Albecker MA, Belden LK, McCoy MW. Comparative Analysis of Anuran Amphibian Skin Microbiomes Across Inland and Coastal Wetlands. MICROBIAL ECOLOGY 2019; 78:348-360. [PMID: 30535916 DOI: 10.1007/s00248-018-1295-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 11/15/2018] [Indexed: 05/16/2023]
Abstract
Amphibians host a community of microbes on their skin that helps resist infectious disease via the dual influence of anti-pathogenic microbial species and emergent community dynamics. Many frogs rely on freshwater habitats, but salinization is rapidly increasing saltwater concentrations in wetlands around the globe, increasing the likelihood that frogs will come into contact with salt-contaminated habitats. Currently, we know little about how increased salt exposure will affect the symbiotic relationship between the skin microbes and frog hosts. To better understand how salt exposure in a natural context affects the frog skin microbiome, we use Hyla cinerea, a North American treefrog species that can inhabit brackish wetlands, to explore three questions. First, we determine the extent that microbial communities in the environment and on frog skin are similar across populations. Second, we assess the microbial species richness and relative abundance on frogs from habitats with different salinity levels to determine how salinity affects the microbiome. Third, we test whether the relative abundances of putatively pathogen-resistant bacterial species differ between frogs from inland and coastal environments. We found that the frog microbiome is more similar among frogs than to the microbial communities found in surface water and soil, but there is overlap between frog skin and the environmental samples. Skin microbial community richness did not differ among populations, but the relative abundances of microbes were different across populations and salinities. We found no differences in the relative abundances of the anti-fungal bacteria Janthinobacterium lividum, the genus Pseudomonas, and Serratia marcescens, suggesting that environmental exposure to saltwater has a limited influence on these putatively beneficial bacterial taxa.
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Affiliation(s)
- Molly A Albecker
- Department of Biology, East Carolina University, Greenville, NC, USA.
| | - Lisa K Belden
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Michael W McCoy
- Department of Biology, East Carolina University, Greenville, NC, USA
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10
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Bragg RR, Meyburgh CM, Lee JY, Coetzee M. Potential Treatment Options in a Post-antibiotic Era. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1052:51-61. [DOI: 10.1007/978-981-10-7572-8_5] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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11
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Bletz MC, Myers J, Woodhams DC, Rabemananjara FCE, Rakotonirina A, Weldon C, Edmonds D, Vences M, Harris RN. Estimating Herd Immunity to Amphibian Chytridiomycosis in Madagascar Based on the Defensive Function of Amphibian Skin Bacteria. Front Microbiol 2017; 8:1751. [PMID: 28959244 PMCID: PMC5604057 DOI: 10.3389/fmicb.2017.01751] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 08/28/2017] [Indexed: 12/12/2022] Open
Abstract
For decades, Amphibians have been globally threatened by the still expanding infectious disease, chytridiomycosis. Madagascar is an amphibian biodiversity hotspot where Batrachochytrium dendrobatidis (Bd) has only recently been detected. While no Bd-associated population declines have been reported, the risk of declines is high when invasive virulent lineages become involved. Cutaneous bacteria contribute to host innate immunity by providing defense against pathogens for numerous animals, including amphibians. Little is known, however, about the cutaneous bacterial residents of Malagasy amphibians and the functional capacity they have against Bd. We cultured 3179 skin bacterial isolates from over 90 frog species across Madagascar, identified them via Sanger sequencing of approximately 700 bp of the 16S rRNA gene, and characterized their functional capacity against Bd. A subset of isolates was also tested against multiple Bd genotypes. In addition, we applied the concept of herd immunity to estimate Bd-associated risk for amphibian communities across Madagascar based on bacterial antifungal activity. We found that multiple bacterial isolates (39% of all isolates) cultured from the skin of Malagasy frogs were able to inhibit Bd. Mean inhibition was weakly correlated with bacterial phylogeny, and certain taxonomic groups appear to have a high proportion of inhibitory isolates, such as the Enterobacteriaceae, Pseudomonadaceae, and Xanthamonadaceae (84, 80, and 75% respectively). Functional capacity of bacteria against Bd varied among Bd genotypes; however, there were some bacteria that showed broad spectrum inhibition against all tested Bd genotypes, suggesting that these bacteria would be good candidates for probiotic therapies. We estimated Bd-associated risk for sampled amphibian communities based on the concept of herd immunity. Multiple amphibian communities, including those in the amphibian diversity hotspots, Andasibe and Ranomafana, were estimated to be below the 80% herd immunity threshold, suggesting they may be at higher risk to chytridiomycosis if a lethal Bd genotype emerges in Madagascar. While this predictive approach rests on multiple assumptions, and incorporates only one component of hosts' defense against Bd, their culturable cutaneous bacterial defense, it can serve as a foundation for continued research on Bd-associated risk for the endemic frogs of Madagascar.
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Affiliation(s)
- Molly C Bletz
- Zoologisches Institut, Technische Universität BraunschweigBraunschweig, Germany.,Department of Biology, James Madison UniversityHarrisonburg, VA, United States
| | - Jillian Myers
- Ecology and Evolutionary Biology, University of MichiganAnn Arbor, MI, United States
| | - Douglas C Woodhams
- Department of Biology, University of Massachusetts BostonBoston, MA, United States
| | | | | | - Che Weldon
- Unit for Environmental Sciences and Management, North-West UniversityPotchefstroom, South Africa
| | - Devin Edmonds
- Illinois Natural History Survey University of Illinois at Urbana-ChampaignChampaign, IL, United States
| | - Miguel Vences
- Zoologisches Institut, Technische Universität BraunschweigBraunschweig, Germany
| | - Reid N Harris
- Department of Biology, James Madison UniversityHarrisonburg, VA, United States
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From Immunologically Archaic to Neoteric Glycovaccines. Vaccines (Basel) 2017; 5:vaccines5010004. [PMID: 28134792 PMCID: PMC5371740 DOI: 10.3390/vaccines5010004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 11/14/2016] [Accepted: 01/22/2017] [Indexed: 12/13/2022] Open
Abstract
Polysaccharides (PS) are present in the outermost surface of bacteria and readily come in contact with immune cells. They interact with specific antibodies, which in turn confer protection from infections. Vaccines with PS from pneumococci, meningococci, Haemophilus influenzae type b, and Salmonella typhi may be protective, although with the important constraint of failing to generate permanent immunological memory. This limitation has in part been circumvented by conjugating glycovaccines to proteins that stimulate T helper cells and facilitate the establishment of immunological memory. Currently, protection evoked by conjugated PS vaccines lasts for a few years. The same approach failed with PS from staphylococci, Streptococcus agalactiae, and Klebsiella. All those germs cause severe infections in humans and often develop resistance to antibiotic therapy. Thereby, prevention is of increasing importance to better control outbreaks. As only 23 of more than 90 pneumococcal serotypes and 4 of 13 clinically relevant Neisseria meningitidis serogroups are covered by available vaccines there is still tremendous clinical need for PS vaccines. This review focuses on glycovaccines and the immunological mechanisms for their success or failure. We discuss recent advances that may facilitate generation of high affinity anti-PS antibodies and confer specific immunity and long-lasting protection.
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Persistence of rubella and mumps antibodies, following changes in the recommended age for the second dose of MMR vaccine in Portugal. Epidemiol Infect 2016; 144:3139-3147. [DOI: 10.1017/s0950268816001655] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
SUMMARYIn Portugal, the recommended age for the second dose of MMR (MMR2) was changed from 10–13 years to 5–6 years for those born in 1994 and afterwards. This study aimed to assess if MMR schedule and time elapsed from the last dose are associated with the concentration of rubella and mumps IgG antibodies. Three Portuguese birth cohorts (convenience samples) were selected for this study (66, 59 and 41 participants born respectively in 1990–1993, 1994–1995 and 2001–2003). Geometric mean concentrations (GMC) for mumps IgG were respectively 36, 30 and 38 RU/ml (P = 0·236) and for rubella IgG were 18, 20 and 17 IU/ml (P = 0·641). For both specific antibodies, no differences were observed with time since MMR2. Receiving MMR2 at 5–6 or 10–13 years was not associated with concentration of both antibodies. The GMC of rubella IgG was lower in males (P = 0·029). Taking into account previous evidence and the logistics needed to change vaccination schedules, it seems reasonable that sustaining very high coverage with two doses of MMR is currently the most pragmatic way to control mumps and rubella rather than any changes to the schedule.
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Gonçalves G, Frade J, Nunes C, Mesquita JR, Nascimento MSJ. Persistence of measles antibodies, following changes in the recommended age for the second dose of MMR-vaccine in Portugal. Vaccine 2015; 33:5057-63. [PMID: 26319061 DOI: 10.1016/j.vaccine.2015.08.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 07/10/2015] [Accepted: 08/17/2015] [Indexed: 11/27/2022]
Abstract
In populations vaccinated with two doses of combined measles-mumps-rubella vaccine (MMR), the serum levels of antibodies against measles depend on the vaccination schedule, time elapsed from the last dose and the area-specific epidemiological situation. Variables measuring "schedule" are age at first and second doses of MMR and intervals derived from that. Changes in vaccination schedules have been made in Portugal. The specific objectives of this study were to measure the association between those potential determinants and the concentration of measles-specific IgG antibodies, after the second dose of MMR. Convenience samples of three Portuguese birth cohorts were selected for this study (41, 66 and 60 born, respectively, in 2001-2003, 1990-1993 and 1994-1995). Geometric mean concentrations (GMC) for measles IgG were, respectively, 934, 251 and 144mIU/ml; p<0.001). Anti-measles-IgG serum concentration decreased with time since last vaccination (waning immunity) and was not influenced by any other component of vaccination schedule, namely age at vaccination with the second dose of MMR. Waning levels of measles antibodies have been observed elsewhere but not as fast as it was observed in Portuguese birth cohorts in this study. Changes in the vaccination schedules might have to be considered in the future.
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Affiliation(s)
- Guilherme Gonçalves
- Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto Rua de Jorge Viterbo Ferreira, no. 228, Porto 4050-313, Portugal; Unit for Multidisciplinary Biomedical Research (UMIB) Rua de Jorge Viterbo Ferreira, no 228, Porto 4050-313, Portugal.
| | - João Frade
- School of Health Sciences, Polytechnic Institute of Leiria Campus 2 - Morro do Lena - Alto do Vieiro, Apartado 4137, Leiria 2411-901, Portugal; National School of Public Health, Universidade Nova de Lisboa Avenida Padre Cruz, Lisboa 1600-560, Portugal.
| | - Carla Nunes
- National School of Public Health, Universidade Nova de Lisboa Avenida Padre Cruz, Lisboa 1600-560, Portugal; Centro de Investigação em Saúde Pública (CISP) Avenida Padre Cruz, Lisboa 1600-560, Portugal.
| | - João Rodrigo Mesquita
- Agrarian Superior School, Polytechnic Institute of Viseu Quinta da Alagoa - Estrada de Nelas, Ranhados, Viseu 3500-606, Portugal.
| | - Maria São José Nascimento
- Laboratory of Microbiology, Department of Biological Sciences, Faculty of Pharmacy of University of Porto Rua de Jorge Viterbo Ferreira, no. 228, Porto 4050-313, Portugal.
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15
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Scarbrough Lefebvre CD, Terlinden A, Standaert B. Dissecting the indirect effects caused by vaccines into the basic elements. Hum Vaccin Immunother 2015; 11:2142-57. [PMID: 26186100 PMCID: PMC4635729 DOI: 10.1080/21645515.2015.1052196] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Vaccination directly protects vaccinated individuals, but it also has the potential for indirectly protecting the unvaccinated in a population (herd protection). Unintended negative consequences such as the re-manifestation of infection, mainly expressed as age shifts, result from vaccination programs as well. We discuss the necessary conditions for achieving optimal herd protection (i.e., high quality vaccine-induced immunity, substantial effect on the force of infection, and appropriate vaccine coverage and distribution), as well as the conditions under which age shifts are likely to occur. We show examples to illustrate these effects. Substantial ambiguity in observing and quantifying these indirect vaccine effects makes accurate evaluation troublesome even though the nature of these outcomes may be critical for accurate assessment of the economic value when decision makers are evaluating a novel vaccine for introduction into a particular region or population group. More investigation is needed to identify and develop successful assessment methodologies for precisely analyzing these outcomes.
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16
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Baltzell P, Newton H, O'Connor A. A Critical Review and Meta-Analysis of the Efficacy of Whole-Cell Killed Tritrichomonas foetus
Vaccines in Beef Cattle. J Vet Intern Med 2013; 27:760-70. [DOI: 10.1111/jvim.12112] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 02/28/2013] [Accepted: 04/12/2013] [Indexed: 11/27/2022] Open
Affiliation(s)
- P. Baltzell
- Veterinary Diagnostic and Production Animal Medicine; College of Veterinary Medicine; Iowa State University; Ames IA
| | - H. Newton
- Veterinary Diagnostic and Production Animal Medicine; College of Veterinary Medicine; Iowa State University; Ames IA
| | - A.M. O'Connor
- Veterinary Diagnostic and Production Animal Medicine; College of Veterinary Medicine; Iowa State University; Ames IA
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17
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Dargent F, Torres-Dowdall J, Scott ME, Ramnarine I, Fussmann GF. Can mixed-species groups reduce individual parasite load? A field test with two closely related poeciliid fishes (Poecilia reticulata and Poecilia picta). PLoS One 2013; 8:e56789. [PMID: 23437237 PMCID: PMC3577744 DOI: 10.1371/journal.pone.0056789] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 01/15/2013] [Indexed: 11/22/2022] Open
Abstract
Predation and parasitism are two of the most important sources of mortality in nature. By forming groups, individuals can gain protection against predators but may increase their risk of being infected with contagious parasites. Animals might resolve this conflict by forming mixed-species groups thereby reducing the costs associated with parasites through a relative decrease in available hosts. We tested this hypothesis in a system with two closely related poeciliid fishes (Poecilia reticulata and Poecilia picta) and their host-specific monogenean ectoparasites (Gyrodactylus spp.) in Trinidad. Fish from three different rivers were sampled from single and mixed-species groups, measured and scanned for Gyrodactylus. The presence and abundance of Gyrodactylus were lower when fish of both species were part of mixed-species groups relative to single-species groups. This is consistent with the hypothesis that mixed-species groups provide a level of protection against contagious parasites. We discuss the importance of potentially confounding factors such as salinity and individual fish size.
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Affiliation(s)
- Felipe Dargent
- Department of Biology, McGill University, Montreal, Quebec, Canada.
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18
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Mishra RPN, Oviedo-Orta E, Prachi P, Rappuoli R, Bagnoli F. Vaccines and antibiotic resistance. Curr Opin Microbiol 2012; 15:596-602. [PMID: 22981392 DOI: 10.1016/j.mib.2012.08.002] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 08/08/2012] [Accepted: 08/14/2012] [Indexed: 12/29/2022]
Abstract
Vaccines and antibiotics have significantly contributed to improve health and also to increase the longevity of human beings. The fast-acting effect of antibiotics makes them indispensable to treat infected patients. Likewise, when the causative agent of the infection is unknown and in cases of superinfections with different species of bacteria, antibiotics appear to be the only therapeutic option. On the contrary, vaccines are usually not efficacious in people already infected and their action is generally limited to a much narrowed range of pathogens. However, vaccines have contributed to the eradication of some of the most deadly infectious agents worldwide, can generate immunity to infections lasting for several years or life-long, and are able to induce herd immunity. Nonetheless, infectious diseases are still among the leading causes of morbidity and mortality worldwide. This is mainly owing to the emergence of bacterial resistance to antibiotics and the lack of efficacious medications to treat several other infectious diseases. Development of new vaccines appears to be a promising solution to these issues. Indeed, with the advent of new discovery approaches and adjuvants, today is possible to make vaccines virtually against every pathogen. In addition, while vaccine-resistant bacteria have never been reported, accumulating literature is providing evidence that vaccination can reduce the raise of antibiotic resistant strains by decreasing their use.
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Affiliation(s)
- Ravi P N Mishra
- Novartis Vaccines, Research Center, via Fiorentina 1, 53100, Siena, Italy
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20
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Domínguez A, Ciruela P, García-García JJ, Moraga F, Sevilla MFD, Selva L, Coll F, Muñoz-Almagro C, Planes AM, Codina G, Jordán I, Esteva C, Hernández S, Soldevila N, Cardeñosa N, Batalla J, Salleras L. Effectiveness of 7-valent pneumococcal conjugate vaccine in the prevention of invasive pneumococcal disease in children aged 7–59 months. A matched case-control study. Vaccine 2011; 29:9020-5. [DOI: 10.1016/j.vaccine.2011.09.034] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 09/02/2011] [Accepted: 09/09/2011] [Indexed: 11/29/2022]
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21
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Coste-utilidad de la incorporación de las nuevas vacunas antineumocócicas conjugadas al programa de vacunación de la comunidad de Madrid. Impacto sobre la enfermedad neumocócica invasora. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s1576-9887(10)70021-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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