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Replication of recombinant MDVs in vaccinated chickens. The chickens were vaccinated and superinfected with vRB-1B_S-Meq, vRB-1B_Meq, or vRB-1B_L-Meq. The viral loads in whole blood were monitored using quantitative polymerase chain reaction with primers specific to the infected cell protein 4 (ICP4) gene of Marek’s disease virus. The growth kinetics among the groups were analyzed using the Kruskal–Wallis test.
