• Rev Med Interne · Jul 2024

    Case Reports

    Acute Q fever revealed by an anti-phospholipid syndrome: A case report.

    • K Balasoupramanien, J-B Roseau, N Cazes, C Surcouf, and E Le Dault.
    • 173rd Medical Unit, 11th Army Medical Centre, 10, rue Roquemaurel, 31032 Toulouse, France.
    • Rev Med Interne. 2024 Jul 1; 45 (7): 444446444-446.

    IntroductionQ fever is a zoonosis caused by Coxiella burnetii. Acute infection is mainly asymptomatic. In other cases it mainly causes a flu-like illness, a pneumonia, or an hepatitis. We present an atypical case of an acute Q fever revealed by a massive pleural effusion.Case ReportWe report the case of a 43-year-old man referred to our hospital for an acute respiratory distress. Further analyses showed an exudative eosinophilic pleural effusion, associated with a pulmonary embolism and a deep femoral vein thrombosis. Aetiologic explorations revealed an acute Q fever (IgM and IgG against C. burnetii phase II antigens) associated with anti-phospholipids. The outcome was favorable with vitamin K antagonists, doxycycline, and hydroxychloroquine, till the negativation of the anti-phospholipid antibodies.Discussion And ConclusionDuring acute C. burnetii infections, anti-phospholipid antibodies are highly prevalent but thrombotic complications are rare. The 2023 ACR/EULAR APS criteria restricts the diagnosis of APS, as in our case of acute severe infection. In front of an atypical pneumonia and/or thrombotic events, screening of C. burnetii and anti-phospholipid antibodies could be useful. Given its low level of evidence, prolongated treatment by doxycycline, hydroxychloroquine ± anticoagulant for C. burnetii's associated anti-phospholipid syndrome is discussed, but succeeded in our case.Copyright © 2024 The Author(s). Published by Elsevier Masson SAS.. All rights reserved.

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