Abstract
Abstract Non-pneumophila Legionella species are rare atypical bacterial pathogens that are responsible for a minority of Legionnaires' disease cases. Compared to Legionella pneumophila, they are more likely to infect immunosuppressed patients, such as those undergoing treatment for hematological cancers. This paper describes 3 cases of cancer patients who were effectively treated for pneumonia caused by non-pneumophila species, definitively identified via culture or microbial cell-free DNA (mcfDNA) analysis. This paper also compiles a list of other reported cases of cancer patients diagnosed with non-pneumophila Legionnaires' disease. Although diagnosis of pneumonia by a non-pneumophila Legionella species is challenging with currently available techniques, recommended antibiotic regimens are well established in the literature. Although they statistically appear to be uncommon pathogens, non-pneumophila Legionella species should be considered as possible causes when treating immunosuppressed patients with unspecified pneumonia.
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