| seroprevalence survey of aino virus infection in dairy cattle of fukuoka, japan in 1990. | the seroprevalence and seroconversion to aino virus infection were epidemiologically analyzed in fukuoka prefecture, by a cohort study, in 1990. serum samples (872) were taken from 436 cattle of 128 farms in five different districts at twice sampling with four month-intervals and were tested by a serum neutralizing test with aino virus. in the first sampling (may-july), 38.3% of sera and 40.6% of farms tested were positive and 33.3% of cattle and 40.6% of farms were sero-converted during the per ... | 1995 | 7756398 |