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To clarify the level of excretion of a recombinant Marek’s disease virus type 1 (rMDV1) that confers good protection in chickens against both Marek’s and Newcastle diseases, even in the presence of maternal antibodies, contact transmission tests were conducted. Naı̈ve chickens kept in the same cage or room with chickens inoculated with rMDV1 did not produce antibodies against MDV1 or the fusion protein...
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