Stenotrophomonas maltophilia Infections in Hospitalized Patients at Siriraj Hospital

Ninety-seven strains of Stenotrophomonas maltophilia isolated from 62 patients hospitalized at Siriraj Hospital from September 2005 to February 2006 were studied. Ninety-two strains (94.8%) were isolated from respiratory secretions and five strains (5.2%) were from blood. Only 39.3% of the patients who had S. maltophilia isolated from their clinical specimens had infections. All S. maltophilia infections were hospital acquired and the infected patients had underlying diseases, multiple medical devices and received multiple antibiotics prior to S. maltophilia infections. Pneumonia was the most common site of infections. S. maltophilia was susceptible to co-trimoxazole in 68.8% of the isolates. The overall mortality of the patients with S. maltophilia infections was 45.5%.