Antibody Response in Cattle and Guinea Pigs Inoculated with Rabies Vaccines

ABSTRACT

One hundred ninety-five rabies cases in cattle were identified in South Korea since 1993. As most of rabies cases have a relation to rabid Korean raccoon dogs (Nyctereutes procyonoides koreensis), vaccination to animals including cattle is mandatory in rabies risk region. In order to minimize fatal rabies in animals, eradication policy of the disease has been achieved by controlling reservoirs and by mass vaccination. In this study, we compared the antibody response in cattle and guinea pigs inoculated with rabies vaccines commercially available in Korea. Each group of cattle in Gangwon-do was vaccinated intramuscularly with either one of five commercial inactivated vaccines or a live attenuated rabies vaccine (designated as A to F). Serum samples at the time of vaccination and four weeks post vaccination were obtained from the cattle and guinea pigs and were analyzed with virus neutralizing assay (VNA). Each group of cattle inoculating rabies vaccines showed significant virus neutralizing antibody titers (p < 0.05) ranging from 1.55 to 17.8 mean IU/ml compared with the non-vaccinated cattle and guinea pigs inoculated with 1/20 dose of vaccine showed relatively low VN antibody titers ranging from 0.23 to 6.1 mean IU/ml. All cattle immunized with A, C and F showed high VN antibody titers over 0.5 IU/ml and 62.5% and 37.5% of cattle inoculated with D and E showed protective antibody titer, respectively. This finding suggests that the inactivated or live attenuated rabies vaccination commercially available in Korea could induce protective antibody response in Korean cattle, but sero-conversion rate and sero-positive rate showing VN antibody titer over 0.5 IU/ml depend on vaccines.