This preliminary study was realized to assess the effects of Thuya occidentalis in homeopathic dilution (200 centesimal dilution) on nonspecific lymphoblastogenesis of goats vaccinated against bluetongue virus serotype 2 (BTV). Twenty Saanen goats were treated as follows: six goats were vaccinated with a live attenuated vaccine against BTV, four goats were vaccinated and injected with 1 ml of an alcoholic solution containing Thuya occidentalis, six goats were neither vaccinated nor given thuya, the remaining four goats were not vaccinated, but treated with thuya. Administration of thuya prevented depression of nonspecific lymphoblastogenesis, which followed vaccination.