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Most patients present with acute respiratory symptoms and systemic illness. When <jats:italic>C. psittaci<\/jats:italic> infects pregnant women, it causes severe clinical manifestations called gestational psittacosis. Here we report a case of gestational psittacosis. Our patient lacked respiratory symptoms, and pathological postmortem examinations revealed severe placentitis. Both DNA and immunohistochemical analyses were positive for <jats:italic>C. psittaci<\/jats:italic> from formalin\u2010fixed paraffin\u2010embedded tissues. The chlamydial DNA in the placenta was about 100 times more abundant than that in the lungs; therefore, the placenta rather than the lungs was the probable target of the <jats:italic>C. psittaci<\/jats:italic> infection during this pregnancy. We could not identify the source of infection. Gestational psittacosis should be considered in the differential diagnosis for fever of unknown origin during pregnancy, even in cases lacking respiratory symptoms.<\/jats:p>","DOI":"10.1111\/jog.15429","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T06:00:51Z","timestamp":1663048851000},"page":"3325-3330","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A fatal case of hemophagocytic lymphohistiocytosis associated with gestational psittacosis without symptoms of pneumonia"],"prefix":"10.1111","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5571-2182","authenticated-orcid":false,"given":"Michinobu","family":"Yoshimura","sequence":"first","affiliation":[{"name":"Department of Developmental Medicine Research Institute, Osaka Women's and Children's Hospital  Osaka 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