Spinoff: do you wear shoes in your house?

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shoes are filthy.

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researchers at the University of Arizona found nine different species of bacteria on people's shoes. These types of bacteria can cause infections in our stomachs, eyes and lungs. The study also found bacteria live longer on our shoes than in other places. As we walk, we constantly pick up new debris that feeds the growth of more bacteria.

The researchers tested to see if bacteria on shoes would transfer to the tile floors in a house. More than 90 percent of the time it did. Carpeting harbors bacteria even more

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"Toilet seats generally have 1,000 bacteria or less, and these are in the millions so there's a lot more bacteria here."

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Children under age 2 are the most vulnerable to the germs we track into the house, because they play on the floor and put their hands in their mouths an average of 80 times an hour

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Out of "GMA's" 10 tests, nine contained coliform, a type of bacteria that comes mostly from human and animal waste.

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