Herd-level seroprevalence of swine-influenza virus in Korea

Jung, Tae-Hwa; Choi, Changsun; Chung, Han Kook; Kim, Jung-Hyun; Cho, Wan‐Seob; Jung, Kwonil; Chae, Chanhee

doi:10.1016/s0167-5877(01)00285-9

Cited by 9 publications

(16 citation statements)

References 9 publications

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“…This study also showed herd‐level prevalences of 64·7% for H1N1 SIV and 58·8% for human H1N1, which are close to the reported in Korean herds (71·5%) 12 . In addition, a herd‐level prevalence of 80·1% in saws was found in Canada, 13 which is slightly higher than our results.…”

Section: Discussionsupporting

confidence: 83%

Serological evidence of swine influenza in Brazil

Rajão

Alves

Puerto

et al. 2012

Influenza Resp Viruses

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Please cite this paper as: Rajão et al. (2013). Serological evidence of swine influenza in Brazil. Influenza and Other Respiratory Viruses 7(2), 109–112.The aim of this work was to detect serum antibodies specific to influenza viruses in swine in Brazil. Serum samples of 355 pigs from 17 herds in Minas Gerais state were tested by hemagglutination inhibition (HI) for antibodies against H1N1 swine (SIV) and human influenza viruses, and H3N2 SIV. HI revealed that 158 animals (44·5%) and 11 herds (64·7%) were positive for H1N1 SIV, 36 animals (10·1%) and four herds (23·5%) were positive for H3N2 SIV, and 136 animals (38·3%) and 10 herds (58·8%) were positive for H1N1 human. This study indicates that swine influenza is disseminated throughout Minas Gerais state, Brazil.

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Section: Discussionsupporting

confidence: 83%

Serological evidence of swine influenza in Brazil

Rajão

Alves

Puerto

et al. 2012

Influenza Resp Viruses

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“…The author further reported that H1N1 subtype‐specific IDEXX ELISA kit exhibited no cross‐reactivity with other SIV subtypes. Therefore, the ELISA kit has been used to determine the seroprevalence of subtype‐specific influenza in pigs in different countries (Poljak et al., 2008; Jung et al., 2002). The only drawback in using the ELISA kit was that, unlike HI test, it may not identify positive animals at the early stage of infection, particularly when the virus is introduced into a naïve swine population (Yoon et al., 2004).…”

Section: Discussionmentioning

confidence: 99%

Seroprevalence and Risk Factors for Influenza A Viruses in Pigs in Peninsular Malaysia

Suriya

Hassan

Omar

et al. 2008

Zoonoses and Public Health

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Following a series of H5N1 cases in chickens and birds in a few states in Malaysia, there was much interest in the influenza A viruses subtypes that circulate among the local pig populations. Pigs may act as a mixing vessel for avian and mammal influenza viruses, resulting in new reassorted viruses. This study investigated the presence of antibodies against influenza H1N1 and H3N2 viruses in pigs from Peninsular Malaysia using Herdcheck Swine Influenza H1N1 and H3N2 Antibody Test Kits. At the same time, the presence of influenza virus was examined from the nasal swabs of seropositive pigs by virus isolation and real time RT-PCR. The list of pig farms was obtained from the headquarters of the Department of Veterinary Services, Malaysia, and pig herds were selected randomly from six of 11 states in Peninsular Malaysia. A total of 727 serum and nasal swab samples were collected from 4- to 6-month-old pigs between May and August 2005. By ELISA, the seroprevalences of swine influenza H1N1 and H3N2 among pigs were 12.2% and 12.1% respectively. Seropositivity for either of the virus subtypes was detected in less than half of the 41 sampled farms (41.4%). Combination of both subtypes was detected in 4% of all pigs and in 22% of sampled farms. However, no virus or viral nucleic acid was detected from nasal samples. This study identified that the seropositivity of pigs to H1N1 and H3N2 based on ELISA was significantly associated with factors such as size of farm, importation or purchase of pigs, proximity of farm to other pig farms and the presence of mammalian pets within the farm.

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“…Influenza A virus infections (flu) in swine cause respiratory disease and decreased growth performance (Olsen et al., 2006). Different studies have demonstrated that flu is widespread in swine throughout the world, and the constant risk of virus transmission, especially to humans (Maes et al., 2000; Jung et al., 2002; Hayden and Croisier, 2005; Maldonado et al., 2006; Myers et al., 2007; Poljak et al., 2008), calls for the need to have a better understanding of influenza transmission in pigs.…”

Section: Introductionmentioning

confidence: 99%

Detection of Airborne Influenza A Virus in Experimentally Infected Pigs With Maternally Derived Antibodies

Corzo

Allerson

Gramer

et al. 2012

Transbound Emerg Dis

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Summary This study assessed whether recently weaned piglets with maternally derived antibodies were able to generate infectious influenza aerosols. Three groups of piglets were assembled based on the vaccination status of the dam. Sows were either non‐vaccinated (CTRL) or vaccinated with the same (VAC‐HOM) strain or a different (VAC‐HET) strain to the one used for challenge. Piglets acquired the maternally derived antibodies by directly suckling colostrum from their respective dams. At weaning, pigs were challenged with influenza virus by direct contact with an infected pig (seeder pig) and clinical signs evaluated. Air samples, collected using a liquid cyclonic air collector, and individual nasal swabs were collected daily for 10 days from each group and tested by matrix real‐time reverse transcriptase polymerase chain reaction (RRT‐PCR) assay. Virus isolation and titration were attempted for air samples on Madin–Darby canine kidney cells. All individual pigs from both VAC‐HET and CTRL groups tested positive during the study but only one pig in the VAC‐HOM group was positive by nasal swab RRT‐PCR. Influenza virus could not be detected or isolated from air samples from the VAC‐HOM group. Influenza A virus was isolated from 3.2% and 6.4% air samples from both the VAC‐HET and CTRL groups, respectively. Positive RRT‐PCR air samples were only detected in VAC‐HET and CTRL groups on day 7 post‐exposure. Overall, this study provides evidence that recently weaned pigs with maternally derived immunity without obvious clinical signs of influenza infection can generate influenza infectious aerosols which is relevant to the transmission and the ecology of influenza virus in pigs.

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Herd-level seroprevalence of swine-influenza virus in Korea

Cited by 9 publications

References 9 publications

Serological evidence of swine influenza in Brazil

Serological evidence of swine influenza in Brazil

Seroprevalence and Risk Factors for Influenza A Viruses in Pigs in Peninsular Malaysia

Detection of Airborne Influenza A Virus in Experimentally Infected Pigs With Maternally Derived Antibodies

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