Fungal infections, including athlete's foot, are specifically caused by fungi. This group of microorganisms thrives in warm, moist environments such as the spaces between the toes and on the soles of the feet. Athlete's foot, or tinea pedis, is a common fungal infection that often arises from exposure to contaminated surfaces, such as gym locker rooms or swimming pools, where fungi can easily spread.
Fungi are distinct from bacteria and viruses. While bacteria are single-celled organisms that can cause various infections and diseases, and viruses are smaller entities that require a living host to replicate, fungi exist in a separate kingdom with unique characteristics. They can reproduce through spores and often manifest as skin infections, especially in areas that are damp or to which moisture is frequently applied. Yeasts, while also considered fungi, are a specific type of fungus that can cause infections like candidiasis but are not the direct cause of athlete's foot. Therefore, recognizing that athlete's foot is specifically attributed to fungi helps clarify the nature of this infection.