SummaryTests of the sera of fifty‐eight bird fanciers, comprising eighteen pigeon faticiers, thirty‐five budgerigar fanciers and five exposed to other birds, against the sera of the pigeon, budgerigar, hen, turkey, pheasant, canary and finch, showed the presence in the avian sera of antigenically related serum albumin and some β‐globulin components. Pigeon serum macro‐ and γ‐globulin components reacted specifically only with the pigeon faticiers'sera, and budgerigar γ‐globulin and a β‐globulin Bβ2G reacted specifically only with budgerigar fanciers'sera. The pigeon fanciers'sera contained the largest amounts of precipitating and haemagglutinating antibody.Avian serum proteins are present in bird droppings, so that the common antigens may cause reactions in affected subjects on exposure to the droppings dust of different birds. The patients'sera may also be useful for characterization of the av
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