[Clinical experiences in the use of para-immunity inducers in cattle during animal exhibitions]

IBR positive cattle after vaccination with dead vaccine may excrete IBR/IPV (BHV-1) virus when facing a stress situation. On cattle exhibitions the share of such individuals may vary between 8 and 34%. Since 1988 in order to protect animals against infections IBR negative cattle and cows on 7 regional, one national and one international exhibitions were treated with Duphamun and Baypamun, respectively. After returning of animals to their owner IBR outbreaks were confirmed in 8 forms. This is low incidence compared with breeding exhibitions that where held in the same place or elsewhere. For protection against BHV-1 virus infection the use of a para-immunity-inducer is recommended. Nevertheless strict quarantine and following serological investigations are essential.