The role of gilts in transmission dynamics of swine influenza virus and impacts of vaccination strategies and quarantine management
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The role of gilts in transmission dynamics of swine influenza virus and impacts of vaccination strategies and quarantine management. / Ryt-Hansen, Pia; Nielsen, Henriette Guldberg; Sørensen, Simon Smed; Larsen, Inge; Kristensen, Charlotte Sonne; Larsen, Lars Erik.
I: Porcine Health Management, Bind 8, Nr. 1, 19, 2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - The role of gilts in transmission dynamics of swine influenza virus and impacts of vaccination strategies and quarantine management
AU - Ryt-Hansen, Pia
AU - Nielsen, Henriette Guldberg
AU - Sørensen, Simon Smed
AU - Larsen, Inge
AU - Kristensen, Charlotte Sonne
AU - Larsen, Lars Erik
N1 - Publisher Copyright: © 2022, The Author(s).
PY - 2022
Y1 - 2022
N2 - Background: Along with an expanding global swine production, the commercial housing and management of swine herds, provide an optimal environment for constant circulation of swine influenza virus (swIAV), thereby challenging farmers and veterinarian in determining optimal control measures. The aim of this study was to investigate the role of gilts in the swIAV transmission dynamics, and to evaluate the impact of different control measures such as quarantine and gilt vaccination. Methods: The study was conducted as a cross-sectional study in ten Danish sow herds, including five swIAV vaccinated and five unvaccinated herds. Blood- and nasal swab samples of gilts, first parity sows and their piglets were collected at different stages in the production system (quarantine in/out, mating, gestation and farrowing) and analyzed for the presence of swIAV and swIAV antibodies. Associations between the detection of swIAV, seroprevalence, antibody levels, sow and gilt vaccination strategy and quarantine biosecurity were thereafter investigated to identify possible risk factors for swIAV introductions and persistence within the herds. Results: Nine of the ten herds of the study had swIAV circulation and swIAV was detected in the quarantine, mating- and farrowing unit. The prevalence of seropositive gilts and first parity sows was significantly higher in the vaccinated herds, but swIAV was still present in nasal swabs from both gilts, first parity sows and piglets in these herds. Quarantine gilt vaccination and all-in/all-out management resulted in a significant reduction of swIAV positive gilts at the end of the quarantine period. Conclusion: The results underline that herd vaccination and/or quarantine facilities are crucial to avoid swIAV introductions into sow herds.
AB - Background: Along with an expanding global swine production, the commercial housing and management of swine herds, provide an optimal environment for constant circulation of swine influenza virus (swIAV), thereby challenging farmers and veterinarian in determining optimal control measures. The aim of this study was to investigate the role of gilts in the swIAV transmission dynamics, and to evaluate the impact of different control measures such as quarantine and gilt vaccination. Methods: The study was conducted as a cross-sectional study in ten Danish sow herds, including five swIAV vaccinated and five unvaccinated herds. Blood- and nasal swab samples of gilts, first parity sows and their piglets were collected at different stages in the production system (quarantine in/out, mating, gestation and farrowing) and analyzed for the presence of swIAV and swIAV antibodies. Associations between the detection of swIAV, seroprevalence, antibody levels, sow and gilt vaccination strategy and quarantine biosecurity were thereafter investigated to identify possible risk factors for swIAV introductions and persistence within the herds. Results: Nine of the ten herds of the study had swIAV circulation and swIAV was detected in the quarantine, mating- and farrowing unit. The prevalence of seropositive gilts and first parity sows was significantly higher in the vaccinated herds, but swIAV was still present in nasal swabs from both gilts, first parity sows and piglets in these herds. Quarantine gilt vaccination and all-in/all-out management resulted in a significant reduction of swIAV positive gilts at the end of the quarantine period. Conclusion: The results underline that herd vaccination and/or quarantine facilities are crucial to avoid swIAV introductions into sow herds.
KW - Biosecurity
KW - Enzootic infections
KW - Gilts
KW - Management
KW - Quarantine
KW - Swine influenza A virus
KW - Vaccination
U2 - 10.1186/s40813-022-00261-2
DO - 10.1186/s40813-022-00261-2
M3 - Journal article
C2 - 35513878
AN - SCOPUS:85129591610
VL - 8
JO - Porcine Health Management
JF - Porcine Health Management
SN - 2055-5660
IS - 1
M1 - 19
ER -
ID: 306600308