title: Development and evaluation of indirect ELISA for the detection of antibodies against Japanese encephalitis virus in swine.
abstract: The Japanese encephalitis virus (JEV) is one of causative agents of reproductive failure in pregnant sows. An indirect enzyme-linked immunosorbent assay (I-ELISA) was examined for its potential use in the rapid monitoring of the JEV, and the results were compared with those from the hemagglutination inhibition (HI) and serum neutralization (SN) tests. The comparative analysis showed that the results of I-ELISA showed a significant correlation with the conventional HI (r = 0.867) and SN tests (r = 0.804), respectively. When the I-ELISA results were compared with the traditional diagnostic assays, the sensitivity of the I-ELISA was 94.3% with the HI test and 93.7% with the SN test, respectively. The specificity was found to be 81.4% and 80.0% with the HI and SN tests, respectively. To determine the applicability of I-ELISA in the field, the serum samples from 720 pigs were collected from 4 regions in Korea between July and August 2004. The results indicated that 21.7% of screened pigs were seropositive for the JEV. The seropositive rates of JEV in the 4 provinces were 12.6% in Gyeonggi, 45.0% in Gyeongnam, 16.7% in Jeonbuk, and 12.2% in Jeju. The I-ELISA methodology developed in this study was shown to have considerable sensitivity and specificity through a comparison with HI and the SN tests. Therefore, it might be one of convenient methods for screening a large number of samples in various fields.
authors.affiliation: National Veterinary Research and Quarantine Service, Ministry of Agriculture and Forestry, Anyang 430-824, Korea. yangdk@nvrqs.go.kr
authors.forename: Dong Kun
authors.initials: DK
authors.lastname: Yang
authors.forename: Byoung Han
authors.initials: BH
authors.lastname: Kim
authors.forename: Seong In
authors.initials: SI
authors.lastname: Lim
authors.forename: Jun Hun
authors.initials: JH
authors.lastname: Kwon
authors.forename: Kyung Woo
authors.initials: KW
authors.lastname: Lee
authors.forename: Cheong Up
authors.initials: CU
authors.lastname: Choi
authors.forename: Chang Hee
authors.initials: CH
authors.lastname: Kweon
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D000956:Antigens, Viral / Q000276:immunology; D004664:Encephalitis Virus, Japanese / Q000276:immunology / Q000302:isolation & purification*; D004672:Encephalitis, Japanese / Q000097:blood / Q000276:immunology / Q000662:veterinary* / Q000821:virology; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000662:veterinary*; D005260:Female; D006385:Hemagglutination Inhibition Tests / Q000662:veterinary; D007723:Korea; D009500:Neutralization Tests / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000097:blood / Q000276:immunology / Q000821:virology*
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral