A survey of antibody to IBR was performed by serum neutralization test and ELISA in cattle sera supplied on demand sampling in Minas Gerais State, during the period of 1990 to 1999. Out of 5511 tested samples, 3206 (58.2%) were positive and out of 335 evaluated counties, 313 (93.4%) had at least one positive result. It was noted an increasing interest by farmers and practitioners on IBR serological diagnosis since 1995, when the amount of animals and counties submitted to test greatly increased in comparison with past years. The role of serology in adequate diagnosis of IBR is discussed.
Cattle; IBR; BHV-1; serology; diagnosis
