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  • Title: Application of a type-specific enzyme-linked immunosorbent assay for equine herpesvirus types 1 and 4 (EHV-1 and -4) to horse populations inoculated with inactivated EHV-1 vaccine.
    Author: Yasunaga S, Maeda K, Matsumura T, Kondo T, Kai K.
    Journal: J Vet Med Sci; 2000 Jul; 62(7):687-91. PubMed ID: 10945284.
    Abstract:
    A type-specific enzyme-linked immunosorbent assay (ELISA) using equine herpesvirus types 1 (EHV-1) and 4 (EHV-4) glycoprotein G was applied for sero-epizootiology of EHV infections in Japan. Recently, an inactivated EHV-1 vaccine has been administered to racehorses for prevention of upper respiratory disease. To examine the effect of the vaccination on the result of the ELISA, 6 horses were experimentally inoculated three times intramuscularly or intranasally with inactivated EHV-1 vaccine. Sera collected from these horses were used to the type-specific ELISA and complement-fixation (CF) test. Although the CF test detected a significant increase of antibody elicited by vaccination, the ELISA did not detect any antibody response. Next, sera collected from thirty-eight horses, which were intramuscularly inoculated with inactivated EHV-1 twice at an interval of four weeks, were used in the ELISA and CF test. The results also indicated that CF titers increased by vaccine inoculation, but ELISA titers did not. To examine epizootiology of EHVs serologically in racehorse populations at two Training Centers of the Japan Racing Association, the type-specific ELISA and CF test were carried out using paired sera collected from racehorses before and after the winter season. The results showed that the ELISA could distinguish EHV-1 and EHV-4 infections in vaccinated horses serologically. In conclusion, the type-specific ELISA is considered to be useful for sero-diagnosis and sero-epizootiological research on EHV-1 and EHV-4 infections not only in unvaccinated horses, but also in vaccinated horses in Japan.
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