Water buffalo (Bubalus bubalis) are susceptible to bovine herpesvirus type 1 (BoHV-1) and a species-specific herpesvirus, bubaline herpesvirus type 1 (BuHV-1). In this study, an attenuated marker BoHV-1 based vaccine against BuHV-1 challenge was evaluated to determine whether it induces protection from viral replication. One group of water buffalo calves was immunized with an attenuated BoHV-1 marker vaccine. A second group was not vaccinated and used as the control. During the post-vaccination period, we monitored the humoral immune response. The efficacy of the vaccine was tested after intranasal challenge of the calves with a BuHV-1 strain. The experiment showed that after vaccination, BuHV-1 replication was significantly reduced by approximately three titer points compared to the controls. The control animals showed high levels of viral shedding and mild signs associated with BuHV-1 infection. Therefore, our study provides evidence for the existence of cross-protection between BoHV-1 and BuHV-1 in buffalo calves.
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