Early testing for fungal infections reduces unnecessary antibiotic use and allows people to start treatment with antifungal medicine, if necessary. Anyone can get a fungal infection, even people who are otherwise healthy. People breathe in or come in contact with fungal spores every day without getting sick.

Fungi are everywhere. Sometimes, they are too small to see with the naked eye. Fungi can live outdoors in soil and on plants, indoors on surfaces and in the air, and on people’s skin and inside the body. There are millions of fungal species, but only a few hundred of them can make people sick.

Mild fungal skin infections can look like a rash and are very common. For example, a ringworm is a skin infection caused by a fungus—not a worm. Fungal infections in the lungs can be more serious and often cause symptoms that are similar to other illnesses, such as bacterial pneumonia or tuberculosis. Finding the correct diagnosis can be difficult and cause delays in getting the right treatment.