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GERMS
Volume 9
Issue 2
10.18683/germs.2019.1162
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Case Report

Pneumonia and Pulmonary Abscess Due to Legionella micdadei in an Immunocompromised Patient

by
Maud Foissac
1,*,
Ludovic Bergon
2,
Johanna Vidal
3,
Paul Cauquil
3,
Albin Mainar
3 and
Morgane Mourguet
1
1
Service de Maladies infectieuses, Centre Hospitalier Castres-Mazamet, 6 Avenue de la Montagne Noire, 81100 Castres, France
2
Service de Microbiologie, Centre Hospitalier Castres-Mazamet, 6 Avenue de la Montagne Noire, 81100 Castres, France
3
Service de Réanimation, Centre Hospitalier Castres-Mazamet, 6 Avenue de la Montagne Noire, 81100 Castres, France
*
Author to whom correspondence should be addressed.
GERMS 2019, 9(2), 89-94; https://doi.org/10.18683/germs.2019.1162
Submission received: 3 March 2019 / Revised: 21 April 2019 / Accepted: 28 April 2019 / Published: 3 June 2019
Versions Notes

Abstract

Introduction: Legionella micdadei are gram-negative bacilli living in soil and aquatic habitats. They are responsible for less than 10% of legionellosis, but have a propensity to affect people suffering from immunodeficiency. Lung cavitations may also occur in this population. Isolation of L. micdadei on clinical samples requires specific culture media that are not routinely used. Moreover, serologic methods and urinary assays are specific for Legionella pneumophila serogroup 1 (the most frequent serogroup isolated from clinical specimens), and lack sensitivity for diagnosing L. micdadei infection. As a consequence, this diagnosis is difficult to confirm. Case report: We report here a severe case of community-acquired legionellosis due to L. micdadei, in a patient under immunosuppressive medications and high-dose corticosteroids for rheumatoid arthritis. The source of his infection was hypothesized to be his continuous positive airway pressure device, which was regularly cleaned with tap water instead of sterile water, thus potentially resulting in Legionella contamination. Conclusions: L. micdadei must be considered as a possible cause of community-acquired severe pneumonia in case of immunodeficiency. For outpatients, advice concerning the cleaning of aerosols-generating devices at home must be emphasized.
Keywords: Legionella micdadei; pulmonary abscess; immunodeficiency; obstructive sleep apnea; continuous positive airway pressure device Legionella micdadei; pulmonary abscess; immunodeficiency; obstructive sleep apnea; continuous positive airway pressure device

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MDPI and ACS Style

Foissac, M.; Bergon, L.; Vidal, J.; Cauquil, P.; Mainar, A.; Mourguet, M. Pneumonia and Pulmonary Abscess Due to Legionella micdadei in an Immunocompromised Patient. GERMS 2019, 9, 89-94. https://doi.org/10.18683/germs.2019.1162

AMA Style

Foissac M, Bergon L, Vidal J, Cauquil P, Mainar A, Mourguet M. Pneumonia and Pulmonary Abscess Due to Legionella micdadei in an Immunocompromised Patient. GERMS. 2019; 9(2):89-94. https://doi.org/10.18683/germs.2019.1162

Chicago/Turabian Style

Foissac, Maud, Ludovic Bergon, Johanna Vidal, Paul Cauquil, Albin Mainar, and Morgane Mourguet. 2019. "Pneumonia and Pulmonary Abscess Due to Legionella micdadei in an Immunocompromised Patient" GERMS 9, no. 2: 89-94. https://doi.org/10.18683/germs.2019.1162

APA Style

Foissac, M., Bergon, L., Vidal, J., Cauquil, P., Mainar, A., & Mourguet, M. (2019). Pneumonia and Pulmonary Abscess Due to Legionella micdadei in an Immunocompromised Patient. GERMS, 9(2), 89-94. https://doi.org/10.18683/germs.2019.1162

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