| identification of a bisegmented double-stranded rna virus (picobirnavirus) in calf faeces. | to determine the incidence of rotavirus infection among dairy herds in the state of são paulo, brazil, 576 faecal samples obtained from calves aged 1-45 days with and without diarrhoea, reared on 63 dairy cattle farms, were analyzed. polyacrylamide gel electrophoresis (page) identified 28 samples positive for group a rotavirus, while four samples, two diarrhoeic and two non-diarrhoeic, showed a bisegmented genome with a typical picobirnavirus pattern. electron microscopy revealed spherical virus ... | 2003 | 12902184 |