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

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