Основната мярка за ефективност е производството на защитни антитела срещу C. perfringens тип A в кръвта на пилетата и в техните яйца.
The studies also looked at death rates in the chicks hatched by vaccinated hens, and at the incidence and the severity of lesions caused by necrotic enteritis in the gut after the chicks were deliberately infected with the bacterium at three weeks of age.