Stenotrophomonas maltophilia (S. maltophilia) infection is usually diagnosed by examining a small sample of blood, mucus, and/or urine. When an infection is suspected, possible sites of infection including wounds, intravenous (vein) catheters, urinary catheters, and breathing machines should also be tested for the presence of S. maltophilia bacteria. 
How to diagnose Stenotrophomonas maltophilia infection ?