Utilising abattoir sero-surveillance for high-impact and zoonotic pig diseases in Lao PDR
Issued Date
2023-02-08
Resource Type
ISSN
09502688
eISSN
14694409
Scopus ID
2-s2.0-85148104184
Pubmed ID
36750223
Journal Title
Epidemiology and Infection
Volume
151
Rights Holder(s)
SCOPUS
Bibliographic Citation
Epidemiology and Infection Vol.151 (2023)
Suggested Citation
Matsumoto N., Douangngeun B., Theppangna W., Khounsy S., Phommachanh P., Toribio J.A., Bush R.D., Selleck P.W., Gleeson L.J., Siengsanan-Lamont J., Blacksell S.D. Utilising abattoir sero-surveillance for high-impact and zoonotic pig diseases in Lao PDR. Epidemiology and Infection Vol.151 (2023). doi:10.1017/S095026882300016X Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/82680
Title
Utilising abattoir sero-surveillance for high-impact and zoonotic pig diseases in Lao PDR
Other Contributor(s)
Abstract
National disease surveillance systems are essential to a healthy pig industry but can be costly and logistically complex. In 2019, Lao People's Democratic Republic (Lao PDR) piloted an abattoir disease surveillance system to assess for the presence of high impact pig diseases (HIPDs) using serological methods. The Lao Department of Livestock and Fisheries (DLF) identified Classical Swine Fever (CSF), Porcine Respiratory and Reproductive Syndrome (PRRS) and Brucella suis as HIPDs of interest for sero-surveillance purposes. Porcine serum samples (n = 597) were collected from six Lao abattoirs in March to December of 2019. Serological enzyme-linked immunosorbent assay (ELISA) methods were chosen for their high-throughput and relatively low-costs. The true seroprevalence for CSF and PRRS seropositivity were 68.7%, 95% CI (64.8-72.3) and 39.5%, 95% CI (35.7-43.5), respectively. The results demonstrated no evidence of Brucella spp. seroconversion. Lao breed pigs were less likely to be CSF seropositive (P < 0.05), whilst pigs slaughtered at <1 year of age were less likely to be PRRS seropositive (P < 0.01). The testing methods could not differentiate between seropositivity gained from vaccine or natural infection, and investigators were unable to obtain the vaccine status of the slaughtered pigs from the abattoirs. These results demonstrate that adequate sample sizes are possible from abattoir sero-surveillance and lifetime health traceability is necessary to understand HIPDs in Lao PDR.