fingers and that's not good because places with lots of people are often ideal for bacterial exchange here luisa picks up a few more bacteria. experts actually consider the metal bars on the stop button fairly harmless parts of your we see large numbers of germs on the seat of your skin flora but also germs that shouldn't be there like i say need to back to in other words someone sat here with a bacterium that could be a pathogen transmitted in large numbers could it. cause an infection. many people expect to find large numbers of bacteria here but in fact the germ load on an escalator is quite low. shopping carts are a different story though there are often lots of classic human bacteria on the grid mostly harmless skin germs but also pathogens that cause diarrhea.