Risk factors and spatial relative risk assessment for influenza A virus in poultry and swine in backyard production systems of central Chile.
Animal Husbandry
/ methods
Animals
Chickens
Chile
/ epidemiology
Ducks
Geese
Influenza A virus
/ physiology
Influenza in Birds
/ epidemiology
Orthomyxoviridae Infections
/ epidemiology
Poultry Diseases
/ epidemiology
Prevalence
Risk
Risk Assessment
Risk Factors
Seroepidemiologic Studies
Sus scrofa
Swine
Swine Diseases
/ epidemiology
Turkeys
Chile
backyard production systems
influenza A virus
spatial risk
surveillance
zoonosis
Journal
Veterinary medicine and science
ISSN: 2053-1095
Titre abrégé: Vet Med Sci
Pays: England
ID NLM: 101678837
Informations de publication
Date de publication:
08 2020
08 2020
Historique:
received:
02
07
2019
revised:
24
10
2019
accepted:
06
02
2020
pubmed:
23
2
2020
medline:
16
3
2021
entrez:
23
2
2020
Statut:
ppublish
Résumé
Backyard production systems (BPS) are a common form of poultry and swine production worldwide. The limited implementation of biosecurity standards in these operations makes BPS a potential source for the emergence of pathogens that have an impact on both animal and public health. Information regarding circulation of influenza A virus (IAV) in poultry and swine raised in BPS is scarce; particularly in South American countries. The objective of this study was to estimate prevalence and seroprevalence of IAV in BPS in central Chile, identify subtype diversity, evaluate risk factors and spatial relative risk for IAV. Samples were collected from 329 BPS from central Chile. Seroprevalence at BPS level was 34.7% (95% CI: 23.1%-46.2%), 19.7% (95% CI: 9.9%-30.6%) and 11.7% (95% CI: 7.2%-16.4%), whereas prevalence at BPS level was 4.2% (95% CI: 0.0%-8.8%), 8.2% (95% CI: 0.8%-14.0%) and 9.2% (95% CI: 4.8%-13.1%), for the Metropolitan, Valparaiso and LGB O'Higgins regions, respectively. Spatial analysis revealed that central-western area of Metropolitan region and the southern province of Valparaiso region could be considered as high-risk areas for IAV (spatial relative risk = 2.2, p < .05). Logistic regression models identified the practice of breeding both poultry and pigs at the BPS as a risk factor (95% CI 1.06-3.75). From 75 IAV ELISA-positive sera, 20 chicken sera had haemagglutination inhibition titres ranging from 20 to 160, and of these, 11 had microneutralization titres ranging from 40 to 960 for one or more IAV subtypes. Identified subtypes were H1, H3, H4, H9, H10 and H12. Results from this study highlight the need for further IAV surveillance programmes in BPS in Chile. Early detection of IAV strains circulating in backyard animals, especially in regions with large human populations, could have an enormous impact on animal and public health.
Identifiants
pubmed: 32086880
doi: 10.1002/vms3.254
pmc: PMC7397882
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
518-526Subventions
Organisme : NIAID NIH HHS
ID : HHSN272201400006C
Pays : United States
Organisme : National Institute of Allergy and Infectious Diseases
ID : HHSN272201400006
Pays : International
Informations de copyright
© 2020 The Authors. Veterinary Medicine and Science Published by John Wiley & Sons Ltd.
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