Vaccination programme for egg drop syndrome EDS, using local prepared vaccines
2010
Ibrahim, N.M.
The present work deals with 9 different trials as vaccination programmes against egg drop syndrome (EDS) using three locally prepared vaccine formulae including cell culture, live attenuated and inactivated vaccines (prepared on chicken embryo fibroblasts), and inactivated duck egg vaccine. The applied programmes include vaccination of young chicks at 4 weeks of age and older ones at 19 weeks of age prior to the start of egg production. Also, these programmes include vaccination of such birds with one and two doses. Evaluation of the applied vaccination programmes was depending on the estimation of specific induced EDS antibodies using serum neutralization test (SNT) and Haemagglutination test (HI), in addition to the egg production curve. All vaccinated chickens were still healthy allover the experimental period showing no abnormal signs confirming safety of the vaccine, and were able to withstand the challenge virus , while, unvaccinated birds did not withstand it. The obtained results revealed that the best vaccination programme is that which included vaccination of chickens at 4 weeks and then revaccinated at 19 weeks of age before starting of the season of egg production (programmes 4,5and6 VP4, VP5 and VP6) and resulted in the highest levels of antibodies and egg production.
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