Gordon Memorial Lecture: People, Poultry and Pathogenic Mycoplasmas

Jordan, F. T. W.

doi:10.1079/wps19850019

World's Poultry Science Journal

1985

DOI: 10.1079/wps19850019

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Gordon Memorial Lecture: People, Poultry and Pathogenic Mycoplasmas

F. T. W. Jordan

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Cited by 2 publications

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“…It is known that strains of Mgallisepticum vary widely in their infectivity, tissue tropism, transmission, antigenic determinants and in their pathogenicity for poultry and other avian embryos (Jordan 1985, Bencina and others 1994, Levisohn and others 1986. In field outbreaks, certain strains of Mgallisepticum can cause more severe respiratory disease in chuckar partridges and pheasants than in chickens (Cookson and Shivaprasad 1994).…”

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Characterisation of Mycoplasma gallisepticum strains involved in respiratory disease in pheasants and peafowl

et al. 2003

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Two cases of Mycoplasma gallisepticum infection in different avian species in backyard gamebird operations in Slovenia were investigated. In the first case, M gallisepticum was associated with severe respiratory disease with almost 20 per cent mortality in pheasants, whereas the infection was less pathogenic for chickens and turkeys reared at the same site. The M gallisepticum isolates from pheasants had a unique pMGA gene sequence containing a repeat of 12 nucleotides, and they contained only small amounts of the cytadhesins MGC1 and MGC3 and no PvpA protein. However, they expressed some typical M gallisepticum proteins and several proteins which were immunogenic for pheasants, chickens and turkeys. A strain of M gallisepticum isolated from the sinus of a pheasant was highly pathogenic for chicken embryos. In the second case, the M gallisepticum strain that was associated with respiratory disease and mortality in peafowl also affected chickens. M gallisepticum strain ULB 992 was isolated from the infraorbital sinus of a dead peafowl. The ULB 992 strain synthesised a small amount of MGC3, a truncated form of MGC1 and lacked PvpA. However, it expressed several proteins which were immunogenic for the birds infected with M gallisepticum at both gamebird operations.

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Characterisation of Mycoplasma gallisepticum strains involved in respiratory disease in pheasants and peafowl

et al. 2003

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Variable expression of epitopes on the surface of Mycoplastna gattisepticum demonstrated with monoclonal antibodies

et al. 1994

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SUMMARYTwelve monoclonal antibodies (Mabs) against Mycoplasma gallisepticum (Mg) strains F, R, S6(208) and PET2 were used for analysis of epitopes of 22 Mg strains. Six Mabs recognized surface epitopes in the majority of strains, but did not react with variant strains like K 503 and K 703. Two Mabs reacted with epitopes on about 56 kilodalton (kDa) proteins and showing consistent expression on Mg colonies. Three Mabs recognized three different variable surface epitopes associated with about 67 kDa proteins and one Mab variable epitope on about 33 and 80 kDa proteins. Two-dimensional immunoblotting showed considerable differences in the charge of proteins bearing variable surface epitopes in different Mg strains. Subcloning of four low passage Mg strains using Mabs for screening populations that derived from a single colony with defined surface epitopes showed that some colonies may switch surface epitopes associated with 67 and 80 kDa proteins. This switching was reversible and generated subpopulations of Mg expressing different combinations of surface epitopes. Phenotypic switching of epitopes probably occurs also in vivo and may be the mechanism enabling Mg to evade the host immune response.

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Gordon Memorial Lecture: People, Poultry and Pathogenic Mycoplasmas

Cited by 2 publications

References 43 publications

Characterisation of Mycoplasma gallisepticum strains involved in respiratory disease in pheasants and peafowl

Characterisation of Mycoplasma gallisepticum strains involved in respiratory disease in pheasants and peafowl

Variable expression of epitopes on the surface of Mycoplastna gattisepticum demonstrated with monoclonal antibodies

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