It is not clear what fungus you are referring to, but the answer to your question is yes. If you or someone you know is suffering from some sort of fungal infection, the condition is quite likely to be contagious. Fungi are transferred very easily from one person to the next, and the only real question is how likely the infection is to spread. This will depend on the location of the infection and how likely other people are to come in contact with it.
For example, ringworm (which is a fungal infection that gets its name from the brown rings that appear on the affected areas of skin) is highly contagious. It can appear on any part of the body, and can be transmitted through direct physical contact or by sharing clothing, towels, and other objects too. Ringworm can also be transmitted by a particular location - for example, locker rooms are places where the infection is often contracted. The fungi are left on the floor or lockers by an infected person, and if these surfaces come into contact with the skin of another visitor, the fungi are transmitted to the new victim. On the other hand, a fungal infection of the vagina, although contagious, is unlikely to be transmitted to just about anyone. There is however a high chance of such an infection being transmitted to a sexual partner.
Fungi thrive in moist places, and therefore any surfaces, objects, or body parts that tend to be moist a lot of the time provide excellent breeding grounds for fungi. This is why places such as locker rooms and public showers are often where fungal infections are contracted, and the toes, feet, genitals, and mouth are common sites of infection.
In order to avoid developing a fungal infection, it is therefore important to keep your skin as dry as possible at all times. Socks and underwear usually end up damp, and should therefore be changed daily, or if necessary, twice a day. If you need to visit a locker room or a public shower, you should always use your own towels and other items, and also avoid walking around barefoot.
You have not provided any details about the symptoms or location of the fungal infection in your question, but if you suspect that you have developed such an infection, you should visit a doctor for a diagnosis. Treatment of fungal infections is usually quite easy, especially in the early stages.
answered by G M