Background: Chlamydia psittaci infection typically causes a mild influ
enza-like illness in humans. However, during pregnancy, this disease m
ay present with severe headache, hypoxemia, thrombocytopenia, anemia,
hepatic dysfunction, and disseminated intravascular coagulation. Limit
ed reports of ovine-acquired psittacosis indicate appreciable maternal
-fetal morbidity and mortality. Case: A 19-year-old woman, gravida 1,
para 0, at 32 weeks and 3 days' gestation developed C psittaci pneumon
ia after exposure to a parakeet. Worsening maternal respiratory status
, development of a coagulopathy, and fetal compromise prompted cesarea
n delivery. Conclusion: Avian strains of C psittaci can cause atypical
pneumonia during pregnancy. Massive placental infection with impaired
placental perfusion may ensue subsequently. Given the serious nature
of the disease and the ineffectiveness of erythromycin treatment, admi
nistration of tetracyclines may be justified, despite the possible adv
erse fetal effects. With persistent disease, early delivery of the fet
us may provide good maternal and fetal outcomes.