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Germs in subways, taxis and buses of big cities get tested — and the results may surprise you

05:02

With gloves and cotton swabs, TODAY national correspondent Jeff Rossen is putting the cleanliness of public transit in New York City, Los Angeles, and Chicago to the test. A bacterial reading below 100 is said to be acceptable, but one germ swab test came up higher than 4,000! See the surprising results.