Researchers developed a genetic fingerprinting tool called microsatellite typing to track and identify outbreaks of a dangerous fungus called Trichosporon asahii in hospitals. This fungus causes life-threatening infections, especially in sick patients with weakened immune systems, and is resistant to many antifungal medications. By analyzing samples from hospitals across South America, scientists discovered multiple instances where the same strain of this fungus infected patients in different hospitals over many years. This new testing method is much cheaper and faster than other genetic tests, making it practical for hospitals worldwide to monitor and control infections caused by this emerging pathogen.