Abstract
An explosive outbreak of respiratory disease, some cases manifesting atypical pneumonia, affected 63% of the children in a grade school and spread from the school into households of the community. Predominant symptom was a lingering dry cough. In most instances the disease was so mild that physicians'' advice was not sought and bed rest was not required. Neutralization studies by Monroe D. Eaton showed a significant rise in antibody titre, using paired acute and convalescent blood sera, against a virus which he and his co-workers had isolated from other cases of atypical pneumonia. It is suggested that "atypical pneumonia" is merely an incident in a widespread mild respiratory disease which is being established as an entity. The disease apparently represents a segment of the common respiratory diseases, alongside influenza and the common cold.

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