bovine viral diarrhoea virus in beef cattle herds of yucatan, mexico: seroprevalence and risk factors. | a survey of bovine viral diarrhoea virus (bvdv) infection was carried out from june 2001 to july 2002 in a non-vaccinated beef cattle population from the livestock region of yucatan, mexico, to assess seroprevalence and identify risk factors related to seroprevalence. the aim was also to estimate the intra-herd correlation (r(e)) and design effect (d) of bvdv seropositivity. cattle were selected by a two-stage cluster sampling. blood samples were collected from 560 animals originating from 40 he ... | 2005 | 16153725 |