You can also give your defense system a boost by taking steps to prevent infection.
Read on for the top 8 germiest public places and ways to stay healthy:
1. Grocery store
Germiest items: Shopping cart handles and seat buckets
Watch out! Shopping cart handles are a breeding ground for infectious viruses and gut-wrenching bacteria.
"Customers may sneeze, wipe their noses, then touch the cart handles," says Lola Stamm, M.S., Ph.D., a microbiologist at the University of North Carolina, Chapel Hill.
They're also contaminated by children's dirty hands. And by leaky meat packages that you toss into your cart.
Poultry and beef can contain bacterial bombs such as salmonella, campylobacter and E. coli, which cause severe diarrhea, intestinal swelling, nausea and vomiting, she says.
"If meat packages leak onto the conveyor belt, it could contaminate the food on the conveyor as well as your hands," Stamm says.
About 70%-80% of the shopping carts tested nationwide had E. coli, says Charles Gerba, Ph.D., a University of Arizona microbiologist who spends a lot of time studying germs in public places.
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