Team spirit isn't the only thing that grows in locker rooms. Shared towels and equipment are a haven for bacteria. One type, called MRSA, or methicillin-resistant Staphylococcus aureus, causes painful, pus-filled sores and can spread from one person to another. MRSA is resistant to many antibiotics and requires special treatment. To protect yourself, avoid sharing towels, razors, uniforms, and other items that touch your skin.