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The occurrence of infections with one or more subgroups of avian leukosis-sarcoma viruses (ALV) was indicated by the demonstration of neutralizing antibodies for these viruses in wildfowl and domestic chickens. These infections persist under natural conditions in the African bush among wildfowl as well as in chickens maintained in isolated villages or a commercial poultry farm. Infections with ALV subgroups A and B were common and some evidence was obtained for infection with subgroup D but subgroup C viruses appeared to be absent. Antibodies for ALV were also found in 14 of 68 human subjects living in the areas studied.
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H. R. Morgan (1973) studied this question.
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