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Many people believe that putting toilet-seat lid down helps to prevent the spread of dangerous germs and viruses. recent study pretty much dispels this supposition. team of microbiologists from University of Arizona conducted research on aerial activity of viral particles after toilet is flushed. The scientists determined that there is little difference in spread of germs, regardless of whether the lid is up or down. Microbiologist Dr Charles Gerba has been studying lavatory pathogens for nearly five decades. He said: "All that air when you flush goes somewhere, and it carries viruses that are in toilet bowl out of it." He said flush forces bacteria out from under the lid and contaminates nearby areas.

The researchers tested the spread of test virus in two bathrooms after flush. The virus was one not able to infect humans. They flushed one bowl with lid up, and another with the lid down. After a minute, they used sponge to swab the surfaces in the toilet. They concluded that there were no significant statistical differences in quantities of the virus in the two bathrooms. They added that the results "demonstrate that closing toilet lid prior to flushing does not mitigate risk of contaminating bathroom surfaces, and that disinfection of all restroom surfaces may be necessary after flushing or after toilet-brush use" to cut spread of germs. They also said it was important to disinfect water in the bowl.