The treatment of primary atypical pneumonia with intravenous doxycycline: a report of clinical observations.

Seventeen cases of primary atypical pneumonia which were probably caused by Mycoplasma pneumoniae were studied as in-patients in hospital. All of these patients were treated with intravenous doxycycline and responded quickly to therapy. It has been shown that approximately 30-50% of the cases with primary atypical pneumonia are caused by M. pneumoniae. The remainder of the cases are caused by either viruses or possibly rickettsiae.