By testing the serum titers of vaccinated ducklings , It was demonstrated that the immune protection period for ducklings of this BAU-1 vaccine was more than 6 weeks.

• 通过对免疫雏鸭的血清抗体滴度进行测定,证实该BAU-1疫苗对雏鸭的免疫保护期在6周以上。