Candida auris (also called C. auris) is a fungus that can cause serious infections. C. auris can spread from one patient to another in hospitals and nursing homes. Patients can carry C. auris somewhere on their body, even if it is not making them sick. This is called colonization. When people in hospitals and nursing homes are colonized, C. auris can spread from their bodies and can get on other people or nearby objects, allowing the fungus to spread to people around them.