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During a surveillance study (2003-2005) in a cattle market in Kolkata city, state of West Bengal, Eastern India, 34 (13.0%) of 260 calves with diarrhoea were positive for group B rotaviruses (GBR) by RNA electrophoresis in polyacrylamide gels. Analysis of the partial VP7 gene sequence of 28 of the 34 GBR strains revealed maximum identities (97.7-99.5% at nucleotide level and 97.8-100% at amino-acid level) with the novel bovine GBR 'Kolkata strains' reported in an earlier surveillance study (1.5%, n=192, 2001-2002) from the same cattle market, and shared low identities of 73.7-78.9% and 80.8-89.6%; 62.6-66.2% and 59.8-65.4%; 58.9-62.2% and 48.6-54.9% at nucleotide and amino-acid level with other bovine, human, and murine GBR. The GBR-infected calves were traced to districts in neighbouring states of West Bengal. Therefore, the present study reports a rapid increase in prevalence (13.0% in 2003-2005 against 1.5% in 2001-2002) of novel GBR strains among calves with diarrhoea, and provides evidence for interstate transmission of GBR.

epidemiology and infection

Evidence for interstate transmission and increase in prevalence of bovine group B rotavirus strains with a novel VP7 genotype among diarrhoeic calves in Eastern and Northern states of India