Zoonotic Flavivirus Exposure in Peri-Urban and Suburban Pig-Keeping in Hanoi, Vietnam, and the Knowledge and Preventive Practices of Pig Farmers

Long, Phạm Thành; Nguyen-Tien, Thang; Magnusson, Ulf; Bui, Vuong Nghia; Lundkvist, Åke; Vu, D.T.; Tran, Son Hai; Can, Minh Xuan; Nguyen-Viet, Hung; Lindahl, Johanna F.

doi:10.3390/tropicalmed7050079

Cited by 2 publications

(1 citation statement)

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“…Japanese encephalitis (JE) is a zoonotic viral disease that is particularly prevalent in rural areas of Southeast Asia due to the close association of reservoirs and amplifying hosts in pig farms and rice paddy fields [1]. An increase in JE cases in urban and peri-urban areas has recently been reported in Asian countries, including Cambodia [2], Vietnam [3], Lao PDR [4], India [5], and Indonesia [6]. In the Indonesian Province of Bali, human JE cases have been reported to be the highest nationally [6] and occur in rural, urban, and peri-urban areas [7,8].…”

Section: Introductionmentioning

confidence: 99%

Seroconversion, genotyping, and potential mosquito vector identification of Japanese encephalitis virus in pig sentinel settings in Bali, Indonesia

Kardena,

Adi,

Astawa

et al. 2024

Vet World

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Background and Aim: Despite the endemicity of Japanese encephalitis virus (JEV) in humans and animals in the Province of Bali, Indonesia, there is little data on whether seroconversion to the virus occurs in pigs, JEV genotypes circulating, and it’s potential mosquito vectors in the area. The aims of this study were to (i) Determine whether JEV infection in Balinese pigs occurs before reaching their sexual maturity, (ii) identify the genotypes of circulating JEV, and (iii) identify potential JEV mosquito vectors at the study sites in urban and peri-urban areas of Bali. Materials and Methods: Sixteen 1-week-old Landrace piglets from two different sows were housed in Denpasar. Similarly, 18 one-week-old mixed-breed piglets of two different sows were housed in Badung Regency. The piglets were bled every 1 to 4 weeks for up to 24 weeks. Serum samples from the 11 piglets were tested for antibodies against JEV, and seroconversion-suspected sera were titrated using an enzyme-linked immunosorbent assay. Blood of seroconverted sera from pigs were tested using polymerase chain reaction (PCR) to detect the genetic sequence of JEV. The mosquitoes in the sentinels were trapped throughout the study period to identify the potential mosquito vectors of JEV. Results: Antibodies were detected in most of the selected piglets’ sera from weeks 1 to 24 of their age. However, sera of pig B9 collected from the sentinel setting in Badung Regency showed a four-fold increase in antibody titer from week 4 to week 8, indicating seroconversion. PCR testing of blood from B9 (pooled blood sample collected from week 5 to week 8) identified JEV nucleic acids, which were phylogenetically classified as belonging to the JEV genotype III. Meanwhile, 1271 of two genera of mosquitoes, Anopheles spp. and Culex spp. were trapped in the pig sentinels. Conclusion: JEV seroconversion likely occurs before the pig reaches sexual maturity in Badung Regency. Sequence data indicate that JEV genotype III is circulating in the pig sentinel setting in the regency; however, circulating genotypes need to be clarified through increased surveillance. Meanwhile, Culex spp. and most likely Culex quinquefasciatus and Anopheles spp. were the dominant mosquitoes present in the study sites set in the urban area of Denpasar and peri-urban areas of Badung, Bali, indicating that these are likely vectors in spread of JEV in the region. Keywords: genotyping, Japanese encephalitis virus, pig sentinel setting, potential mosquito vectors, seroconversion.

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