[Erythema nodosum in Chlamydia pneumoniae infection].

Chlamydia pneumonia is now recognized as a species of the Chlamydia genus distinct from C psittaci and C trachomatis species. It is a common cause of pneumonia and other acute respiratory tract infections. We describe a patient with erythema nodosum secondary to infection with C pneumoniae. Since this agent usually causes a mild illness, with no distinct clinical findings, we recommend adding serological tests for C pneumoniae to other relevant laboratory investigations in patients with erythema nodosum.