HIGHLIGHTS
SUMMARY
Eliciting an early immune_response in posthatch chicks against subsequent field stain MG infection is important. A greater humoral immune_response was observed in layer chicks when injected in ovo with 1.3 × 102 CFU (low) to 1.3 × 106 CFU (high) FMG dosages. It has been reported that vaccination administered by eye drop or spray leads to a faster immune_response compared with other sites or methods. The aims for this study were therefore to examine the effects of the in ovo vaccination of a live attenuated 6/85 MG vaccine administered at different dosages and . . .
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