Researchers from the University of Arizona swabbed shopping cart handles in four states looking for bacterial contamination. 72 percent turned out to have a marker for fecal bacteria. Upon closer inspection of the samples, researchers discovered Escherichia coli (E. coli), on 50 percent of them.
“That’s more than you find in a supermarket’s restroom,” said Charles Gerba, the lead researcher on the study and a professor of microbiology at the University of Arizona. “That’s because they use disinfecting cleaners in the restrooms. Nobody routinely cleans and disinfects shopping carts.”