Abstract
Monitor contact chicks died of Marek's disease (MD) when exposed to 16-month-old clinically normal fowl that had survived a contact exposure initiated at 2 weeks of age. The MD carrier status of 2-year-old survivors was established also by exposure of monitor chicks through inoculation of blood or by direct contact. A quail hen and a gamefowl hen, each with the ocular form of MD, were found to have the MD agent in their blood and to transmit MD to monitor chicks by contact. Sparrows contact-exposed to clinical cases of MD did not develop or transmit MD by contact to monitor chicks.
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