Phan Thi Nga
National Institute of Hygiene and Epidemiology, Ha Noi
Haemagglutination Inhibition test
was applied to study sero-conversion in sentinel pigs in HoaiDuc-HaTay, 2002.
The results showed the sero-conversion in pigs occurs all the year round. Vero
and C6/36 cells were used to isolate JE virus from 83 mosquito pools and 30 pig
blood samples that were collected in HoaiDuc-HaTay, 2002. From mosquito pools,
7 JE virus strains were isolated. From pig blood samples 4 JE viruses were
isolated. These JE virus strains were isolated either in the epidemic or in the
un-epidemic season. This study proves that JE virus is over wintering in
mosquitoes. Genotype I, a new genotype has been found in