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http://www.tbyil.com/Exposed_Toothbrushes.htm
http://www.chacha.com/question/how-dar-do-fecal-spores-fly-from-the-toilet-after-you-flush
http://abcnews.go.com/blogs/health/2012/01/02/flushing-can-spread-diarrhea-disease/
Flushing the toilet with the lid up can spray diarrhea-causing bacteria into the air, according to a new study of hospital toilets.
http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/fecal-matter-on-toothbrush.htm
Finding: CONFIRMED
Explanation: Every time you flush a toilet, it releases an aerosol spray of tiny tainted water droplets.
http://www.journalofhospitalinfection.com/article/S0195-6701(11)00339-2/abstract
Toilet facilities in healthcare settings vary widely, but patient toilets are commonly shared and do not have lids. When a toilet is flushed without the lid closed, aerosol production may lead to surface contamination within the toilet environment.
http://www.learnaboutgerms.arizona.edu/germs_in_the_environment.htm
The most bacteria was found on the toilet seat.
Closing the toilet lid had little effect in reducing the number of bacteria released into the air due to gaps between the top of the porcelain rim and the seat. There is also a gap between the seat and the lid allowing aerosols to
escape into the room.
Another heavily colonized area was the recess under the rim of the toilet where limescale often accumulates, which aids in bacterial retention.
Surface contamination in various locations around the toilet (as far as 83 cm away) was also detected thirty minutes after flushing.
Direct transfer of microbes can easily take place due to aerosol
contamination of bathroom surfaces.
http://consumerist.com/2012/01/09/an-important-lesson-in-bathroom-etiquette/
When you flush your business down the toilet, it’s not a good idea to watch it swirl into oblivion. Researchers say that if you neglect to close the lid before you flush, you’re unleashing countless particles of waste into the air.
An experiment found that a toilet flush sent infectious particles 10 feet into the air, and traces were still found 90 minutes later. Closing the seat still allowed the particles to escape when flushed, but greatly reduced the revolting cloud left hovering over the toilet.