**Ringworm in humans is caused by fungi.**

Ringworm, also known as dermatophytosis, is a common fungal infection that affects the skin, nails, and hair. It is caused by a group of fungi called dermatophytes, which include species such as Trichophyton, Microsporum, and Epidermophyton.

**Fungal Infection:**

Fungal infections are caused by fungi, which are microorganisms that can grow in and on various parts of the body. They can be found in the environment, such as soil, plants, and animals. When fungi come into contact with human skin, they can cause infections.

**Dermatophytes:**

Dermatophytes are a specific group of fungi that have the capability to invade and grow on the skin, hair, and nails. They have the ability to utilize keratin, a protein found in these structures, as a source of nutrients. This is why dermatophyte infections are commonly found in areas with a high concentration of keratin, such as the skin, scalp, nails, and feet.

**Mode of Transmission:**

Ringworm is highly contagious and can be transmitted through direct contact with an infected person, animal, or object. The fungi can survive on surfaces such as towels, clothing, and combs, increasing the risk of transmission. It can also be spread from person to person by sharing personal items or through close contact, such as during sports activities or in crowded environments.

**Symptoms:**

The symptoms of ringworm may vary depending on the location of the infection. Common symptoms include:

1. Red, scaly, and itchy patches on the skin
2. Circular or ring-shaped rash with raised edges
3. Hair loss or bald patches on the scalp
4. Brittle or discolored nails

**Treatment:**

Ringworm can usually be treated with antifungal medications, which can be applied topically or taken orally. Topical antifungal creams, ointments, or powders are commonly used for mild infections, while oral antifungal medications are prescribed for more severe or widespread infections. It is important to complete the full course of treatment to ensure complete eradication of the fungi.

**Prevention:**

To prevent ringworm and other fungal infections, it is important to practice good hygiene:

1. Keep the skin clean and dry.
2. Avoid sharing personal items, such as towels, combs, and clothing.
3. Wear clean and dry socks and shoes.
4. Avoid walking barefoot in public areas, such as locker rooms or swimming pools.
5. Wash hands thoroughly after touching animals or objects that may be contaminated with fungi.

In conclusion, ringworm in humans is caused by fungi, specifically dermatophytes. It is a common fungal infection that can be transmitted through direct contact with an infected person, animal, or object. Proper hygiene practices and prompt treatment can help prevent and control the spread of ringworm.