FIG. 2.
Comparison of efficacies of the killed KBNP-C4152R2L and La Sota oil emulsion vaccines against egg drops in highly vaccinated commercial layers. Fifty-eight 115-day-old commercial layer chickens (Hy-Line brown) which had been highly vaccinated with commercial vaccines were divided into two groups, KBNP-C4152R2L and La Sota oil vaccine groups. All chickens were challenged with 105 EID50 of SNU5074, and clinical signs of infection and weekly egg production rates were observed for 5 weeks. The chickens of the two groups were kept in the same room.