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  • Title: Cross-reactive antibodies to mycoplasmas found in human sera by the enzyme-linked immunosorbent assay (ELISA).
    Author: Sasaki T, Bonissol C, Stoiljkovic B.
    Journal: Microbiol Immunol; 1987; 31(6):521-30. PubMed ID: 3118149.
    Abstract:
    Antibodies against Mycoplasma pneumoniae in patients' sera with M. pneumoniae infection were measured by the complement fixation (CF) test and enzyme-linked immunosorbent assay (ELISA). Many patients' sera cross-reacted with heterologous mycoplasmal ELISA antigens such as M. hominis, M. hyorhinis, M. orale, M. pulmonis and M. salivarium. The sera with high CF (CF greater than or equal to 40) titers gave significantly higher ELISA values to M. hyorhinis (P less than 0.001) and M. pulmonis (P less than 0.001), which are not parasitic for humans, than those with low CF (CF less than 20) titer. Human normal immunoglobulin G (human normal IgG) containing 98% or more IgG, prepared from pooled plasma of at least 500 normal human donors, showed ELISA reactions with all mycoplasmal strains used. The nonspecific adsorption of human normal IgG on the surface of plate wells and on medium components which might contaminate mycoplasmal ELISA antigens could be disregarded. These results suggest that cross-reactive antibodies to mycoplasmas exist in human sera, and they affect the results of ELISA for serodiagnosis of M. pneumoniae infection.
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