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The aim of the study was the comparison of the percentage of the T lymphocytes subpopulation in the blood of chickens vaccinated against Marek’s disease in ovo or during the first day of life. The commercial, lyophylised turkey vaccine strain HVT FC 126 was used in the experiment. A dose of 2400 PFU of the vaccine virus was applied to 28 chicken SPF embryos (group I) on the 18th day of incubation...
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