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

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

Vaccine-Challengea HI titer(log2)
Prior to challenge
Challenge Protection
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)
  1. 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