1 Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina
Mycoplasmas compose a ubiquitous group of minute microorganisms which include saprophytes, commensals, and pathogens. Of the seven species which have been isolated from man, only Mycoplasma pneumoniae has clearly established pathogenicity. Research continues to seek other possible disease relationships, since there are various animal diseases caused by mycoplasmas which have counterparts among human illnesses of unknown cause.
M. pneumoniae can be associated with a wide spectrum of respiratory tract disease, including bullous myringitis, pharyngitis, tracheobronchitis, pneumonia, and subclinical infections. These illnesses are generally mild and occur most frequently between ages 5 and 19 years in slowly progressive epidemics. The clinical aspects of the disease are indistinguishable from virus-associated syndromes, and epidemiologic features are often more suggestive of the diagnosis. Techniques for M. pneumoniae cultivation and serodiagnosis are now adaptable for use in clinical laboratories. Non-specific diagnostic tests, especially cold hemagglutination, have distinctly limited usefulness in pediatrics.
M. pneumoniae is sensitive to the tetracycline drugs and erythromycin; administration of these antibiotics shortens the clinical course of disease but may not be effective for prophylaxis or elimination of the carrier state. For these reasons, vaccines could provide more effective control and are being developed; however, greater experience concerning the relative role of M. pneumoniae among other respiratory disease agents is required before the need for control measures in the general population can be assessed.
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