id author title date pages extension mime words sentences flesch summary cache txt cord-278598-3utk3k6z Tarpey, I. Safety and efficacy of an infectious bronchitis virus used for chicken embryo vaccination 2006-11-17 .txt text/plain 4808 246 62 Recombinant IBVs based on the Beaudette strain expressing the Beaudette spike protein (Beau-R) or that from the virulent M41 strain (BeauR-M41(S)) were assessed for their potential as prototype vaccines for application to 18-day-old embryos. In Experiment 1, three birds from the CV1-vaccinated groups and five in each of Beau-R and BeauR-M41(S) in ovo-vaccinated groups were euthanized 6 days post hatch and their ciliary activity assessed. In Experiment 2 (vaccination dose for the Beaudette-based viruses was 10 4 EID 50 ) birds were challenged at 6 weeks post hatch with virulent M41 virus and the ciliary activity tested on days 5 and 7 post challenge (Fig. 4B) . In Experiment 2 (vaccination dose for the Beaudette-based viruses was 10 4 EID 50 ) birds were challenged at 6 weeks post hatch with virulent M41 virus and the ciliary activity tested on days 5 and 7 post challenge (Fig. 4B) . ./cache/cord-278598-3utk3k6z.txt ./txt/cord-278598-3utk3k6z.txt