| seroreactivity of peruvian sheep and goats to small ruminant lentivirus-ovine progressive pneumonia virus. | sera from 3,369 sheep and 1,394 goats in peru were examined by agar-gel immunodiffusion for antibodies to ovine progressive pneumonia virus (oppv). the point prevalence rates for antibodies to oppv in sheep were 1.7% to 40.6% (mean, 19.02%) in the 7 flocks studied, whereas for goats, the point prevalence rates for antibodies that cross-reacted with oppv in 12 herds were 0.0% to 45.1%. for sheep, a direct association between increasing age and increasing seroreactivity to oppv was established, an ... | 1987 | 3105369 |