Does legionellosis cause lymphocytopenia?

Yes. Legionellosis is a cause of T-Lymphocytopenia.

Legionellosis Legionella pneumophila (gram negative bacterial infection by any species of Legionella including Legionnaire's disease, which is characterized by high fever, malaise, muscle aches, respiratory disorders and headache) wikipedia.

T-Lymphocytopenia Idiopathic CD4+ lymphocytopenia, a depletion of CD4+ lymphocytes below 300 per cubic millimeter, or less than 20% of total lymphocytes, in the absence of HIV infection or other known causes of immunodeficiency wikipedia.

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