A group of researchers at the University of Arizona recently released a study in which they analyzed the bacteria found on reusable shopping bags and grocery carts. As this article summarizes:
Researchers at the University of Arizona say shopping carts and reusable grocery bags are teeming with fecal matter and bacteria, often more than a typical bathroom.
...
72 percent of the carts [tested] had a positive marker for fecal bacteria and half had Escherichia coli (E. coli). He also found reusable shopping bags that are not washed regularly are swarming with bacteria.
Gag.
*******
Sensible update, March 7:
If you wash your hands after grocery shopping you'll probably be fine.
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