Like any other environment that is open to the public, schools can be a breeding ground for bacteria and germs. Illness can spread quickly across a school population if hygiene and general maintenance are neglected. Systematic cleaning of the school gym, cafeteria, washrooms, water fountains, desks, library, and other common areas such as school computer keyboards and entryways, can greatly inhibit the spread of viruses and other contaminants. 80% of germs are transmitted through casual contact with an unsanitary surface such as a table, doorknob or other easily accessible object.