| prevalence of group a and group b rotaviruses in the feces of neonatal dairy calves from california. | 136 fecal samples, collected from 47 dairy calves on a calf ranch and in a dairy herd in california, were tested for the presence of group a and group b rotaviruses by reverse transcription-polymerase chain reaction (rt-pcr). samples were collected from each calf at days 1, 7 and 14. within the 14 day period, 44 calves (94%) were positive for group a rotavirus and an unexpectedly high number of calves (38 calves, 81%) were positive for group b rotavirus. when these samples were examined by polya ... | 1995 | 7621673 |