Abstract
THE hemagglutination inhibition (HI) test (Fahey and Crawley, 1954) for the detection of Mycoplasma gallisepticum (MG) antibodies has become an accepted procedure for the detection of chronic respiratory diseases (CRD) of poultry. It is possible, through the use of this test, to establish and maintain MG free flocks (Crawley and Fahey, 1955). As more emphasis is being placed on the establishment and control of MG free flocks, the testing of sera becomes a major undertaking. A direct serum-agglutination test would have an advantage over the time consuming HI test. The Connaught Laboratories began a project in 1964 to investigate the use of a Mycoplasma gallisepticum serum plate (SP) antigen.This paper reports on the results obtained when testing laboratory and field serum samples for MG antibodies, using the HI and SP tests.MATERIALS AND METHODSStrains: Three strains, S-6, A5969 and 801 were received from the United States Department of…
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