[Protecting chickens against Marek's disease under laboratory conditions by the administration of Marvak, a Czechoslovak produced vaccine and vaccine imported from East Germany].

Laboratory trials were conducted to compare the efficiency of two vaccines against Marek's disease (MD) on the basis of the dynamics of post-vaccination viraemia and by means of a challenge test. Two groups of the HX-SL hybrid layers, each containing 40 birds, were vaccinated with the MARVAK cellular vaccine manufactured in Czechoslovakia (100 PFU per chick… CONTINUE READING