Welcome to Just Answer. MRSA is a staph infection that is resistant to methicillin and some other antibiotics. In the community, it usually responds well to Bactrim. Everyone has staph bacteria on their skin all the time. MRSA is staph that has evolved to be resistant to antibiotics. If someone (adult or child) comes in contact with the fluid from a lesion, and that lesion gets into a scratch or abrasion on their own skin they can get the infection as well. All wounds should be kept covered with bandaids. People with MRSA infections routinely attend work, school, and religious services.