Serological evidence of Chlamydia trachomatis infection in non-immunocompromised adults with pneumonia.

Serological evidence of Chlamydia trachomatis infection in three non-immunocompromised adults with pneumonia is presented. Complement fixation (CF) tests indicated chlamydial infections in all three patients. These illnesses would have been erroneously regarded as ornithosis if microimmunofluorescence (Micro-IF) tests had not been performed because the CF test detects genus-specific antibodies while the Micro-IF test reveals species-specific antibodies.