SYNOPSIS An attempt was made to evaluate the role of Mycoplasma hominis in respiratory infection in adults. Sera collected from patients admitted to hospital with respiratory infections were examined for antibody to M. hominis. The incidence of antibody was no higher than that found previously in patients without respiratory disease.A number of different species of mycoplasmas can be isolated from the upper respiratory tract of man but little evidence has been produced that they behave as pathogens. The exception is Mycoplasma pneumoniae which is well recognized as a respiratory pathogen and is rarely isolated from the oropharynx of healthy individuals. M
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