Legionella pneumophila Arthritis: use of medium specific for Mycobacteria for isolation of L. pneumophila in culture of articular fluid specimens.

We report the first case, to our knowledge, of acute purulent arthritis due to Legionella pneumophila in an immunosuppressed patient. L. pneumophila was isolated from samples of blood and articular fluid cultured with use of medium specific for mycobacteria (Bactec 13A medium).