The effects of selected environmental treatments on the incidence of gross Marek's disease (MD) lesions in chickens contact exposed to MD virus were examined. Treatments were high levels of airborne decomposition products from chicken litter in the rearing environment, disinfectants applied to chickens and their environments, and formaldehyde fumigation of eggs and newly hatched chicks. There were no significant differences in the incidence of gross MD lesions when treated and untreated groups were compared.
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