Abstract
Summary
Complement-fixation tests with the virus of meningo-pneumonitis in Michigan revealed that 61 of 100 pigeons reacted with the antigen; 41 of them in dilutions of 1 :32 or greater. Pigeon serum fails to give the cross-reaction with lymphogranuloma vene-reum antigen which is commonly seen with human serum.
Reactions of variable intensity were obtained with 22 of 109 sera from domestic turkeys, with 5 of 24 sera from domestic ducks and, in the lowest dilution only, with 9 of 45 chicken sera.
No reactions were observed with the sera of 90 wild fowl.
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