Culture-negative endocarditis caused by <i>Stenotrophomonas maltophilia</i>: a report of two cases.

<i>Stenotrophomonas maltophilia</i>, an aerobic, non-fermenting, Gram-negative bacterium, is an emerging nosocomial pathogen. It is considered to be a low-grade pathogen, and infections due to <i>S. maltophilia</i> are uncommon. However, in the recent past, <i>S. maltophilia</i> infections have been on the rise, particularly in patients who are either immunocompromised, aged or on long-term antibiotic therapy. Endocarditis due to <i>S. maltophilia</i> is extremely rare. This is a report of two patients with <i>S. maltophilia</i> endocarditis who were diagnosed by 16S rRNA gene sequencing.