Immunoglobulin receptors used in avian Mycoplasma identification

Among 77 isolates of avian Mycoplasma examined, IgG receptors were demonstrated on six of the nine species represented. Species identified with receptors were: Mycoplasma gallisepticum (two receptors of approximately 84,000 and 75,000 molecular weight [MW]), M. gallinarum (one receptor of approximately 135,000 MW), M. pullorum (one receptor of approximately 130,000 MW), M. gallinaceum (one receptor of approximately 125,000 MW), M. iowae (two receptors of approximately 50,000 and 38,000 MW), and M. synoviae (two receptors of approximately 91,000 and 81,000 MW). The IgG receptors demonstrated in Western blots consistently identified each of the six species. No IgG receptors were detected on M. iners, M. gallopavonis, or M. meleagridis.