Communal bathrooms can harbor plenty of germs and other potentially dangerous microbes, but simple precautions will help keep them at bay. Most pathogens find their way onto bathroom surfaces via the toilet bowl, because feces and even urine can contain many bacteria and viruses, said Charles Gerba, a professor of microbiology at the University of Arizona. Flushing the toilet then disperses the tiny microbes in an aerosolized plume, which can reach five feet into the air and remain suspended for an hour or more before settling on surrounding surfaces, studies show.