What is the cause of scabies?

Scabies is caused by an infestation of the skin by a tiny mite known as Sarcoptes scabiei, a type of parasite. These mites burrow into the upper layer of the skin, leading to intense itching and a rash. The condition is usually transmitted through close physical contact with an infested person, which is why it often spreads in crowded conditions or among people who share close living spaces.

The other causes listed do not pertain to scabies: bacteria can cause infections, fungi lead to conditions such as athlete's foot, and viruses are responsible for diseases like the flu. However, scabies specifically results from a parasitic mite, making the identification of the correct cause crucial for understanding how to treat and prevent the condition effectively.