The aim of this study was to compare the safety parameters of commercial non-attenuated and attenuated (Jeffers, 1975) Eimeria vaccines with EVALON®, a live attenuated coccidiosis vaccine for breeders and layers. 525 chickens were vaccinated orally at 1 day of age with either PBS (group 1), an attenuated vaccine (groups 2 and 4), including EVALON® (HIPRA) (group 2), or non-attenuated vaccines (groups 3 and 5).
Safety concerns regarding coccidiosis vaccines. Comparison of attenuated and non-attenuated vaccines
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