Characterization of virulent Newcastle disease viruses from vaccinated chicken flocks in Eastern China

BMC Veterinary Research

Table 4 Protection of vaccinated SPF chickens with inactivated oil-emulsion vaccines against challenge with the predominant variant NDVs

Vaccine-Challenge^a	HI titer(log2) Prior to challenge	Challenge			Protection
Vaccine-Challenge^a	HI titer(log2) Prior to challenge	Strain	Route	NO. birds	Clinical signs	Mortality
La-JS22	6.3 ± 1.8	JS-01-11-Ch	ED/IN	10	0/10	0 % (0/10)
La-JS14	6.3 ± 1.8	JS-14-12-Ch	ED/IN	10	0/10	0 % (0/10)
Control-JS22	0	JS-01-11-Ch	ED/IN	5	5/5	100 % (5/5)
Control –JS14	0	JS-14-12-Ch	ED/IN	5	5/5	100 % (5/5)
La-PBS	6.3 ± 1.8	PBS	ED/IN	5	0/10	0 % (0/5)
Control-PBS	0	PBS	ED/IN	5	0/10	0 % (0/5)

^aLa-JS22 and Control-JS22 = Challenge with 10⁶ EID₅₀ JS-22-11-Ch; La-JS14 and Control-JS14 = Challenge with 10⁶ EID₅₀ JS-14-12-Ch

ISSN: 1746-6148