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Many possible causes for the acquired irnmunodeficiency syndrome (AIDS) have been proposed since its first recognition in American homosexual men.' 2 Investigation has centred on the search for an infectious agent (or agents), most probably viral,3 and suggested aetiologies have included hepatitis B virus or a hepatitis B virus associated particle,4 cytomegalovirus,6
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Kevin M. De Cock (1984) studied this question.
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