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Distinctive features between community-acquired pneumonia (CAP) due to Chlamydophila psittaci and CAP due to Legionella pneumophila admitted to the intensive care unit (ICU)

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Abstract

The spectrum of community-acquired pneumonia (CAP) due to Chlamydophila psittaci ranges from mild, self-limited CAP, to acute respiratory failure. We performed a retrospective study of 13 consecutive patients with CAP due to C. psittaci and 51 patients with legionellosis admitted in one intensive care unit (ICU) (1993–2011). As compared to patients with legionellosis, patients with psittacosis were younger (median age 48 [38–59] vs. 60 [50–71] years, p = 0.007), less frequently smokers (38 vs. 79 %, p < 0.001), with less chronic disease (15 vs. 57 %, p = 0.02), and longer duration of symptoms before admission (median 6 [5–13] vs. 5 [3–7] days, p = 0.038). They presented with lower Simplified Acute Physiology Score II (median 28 [19–38] vs. 39 [28–46], p = 0.04) and less extensive infiltrates on chest X-rays (median 2 [1–3] vs. 3 [3–4] lobes, p = 0.007). Bird exposure was mentioned in 100 % of psittacosis cases, as compared to 5.9 % of legionellosis cases (p < 0.0001). Extrapulmonary manifestations, biological features, and mortality (15.4 vs. 21.6 %, p = 0.62) were similar in both groups. In conclusion, severe psittacosis shares many features with severe legionellosis, including extrapulmonary manifestations, biological features, and outcome. Psittacosis is an important differential diagnosis for legionellosis, especially in cases of bird exposure, younger age, and more limited disease progression over the initial few days.

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Authors and Affiliations

  1. Service de Maladies Infectieuses et de Réanimation Médicale, Hôpital Pontchaillou, 2 rue Henri Le Guilloux, 35033, Rennes, France

    A. Gacouin, M. Revest, J. Letheulle, P. Fillatre, F. Uhel, P. Tattevin & Y. Le Tulzo

  2. Service de Pneumologie, Hôpital Pontchaillou, 35033, Rennes, France

    S. Jouneau

  3. Laboratoire de Bactériologie, Hôpital Pontchaillou, 35033, Rennes, France

    C. Piau

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  1. A. Gacouin
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  2. M. Revest
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  3. J. Letheulle
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  4. P. Fillatre
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  5. S. Jouneau
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  6. C. Piau
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  7. F. Uhel
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  8. P. Tattevin
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  9. Y. Le Tulzo
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Correspondence to A. Gacouin.

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Gacouin, A., Revest, M., Letheulle, J. et al. Distinctive features between community-acquired pneumonia (CAP) due to Chlamydophila psittaci and CAP due to Legionella pneumophila admitted to the intensive care unit (ICU). Eur J Clin Microbiol Infect Dis 31, 2713–2718 (2012). https://doi.org/10.1007/s10096-012-1618-6

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  • DOI: https://doi.org/10.1007/s10096-012-1618-6

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