Influenza may be prevented by active immunization with a polyvalent killed or subunit vaccine.可以通过主动免疫接种多价灭活疫苗或亚单位疫苗预防流感。
The effect of active immunization against h inhibin on follicles growth,gonadal hormones and laying rate in hens;人抑制素α亚基主动免疫对鸡卵泡发育和性腺激素及产蛋率的影响