One of those who kicked off her shoes and slithered her way through the multihued plastic tubes of a fast-food restaurant playground here one recent morning was not enjoying herself in the least. In fact, she had a frown on her face.
“It’s bad,” Erin M. Carr-Jordan said, swab in hand, as she collected samples from a surface that she would later deliver to a lab for microbial testing. Nearby, a restaurant worker diligently sanitized tabletops and banisters outside the play area, but he did not appear to use his rag and spray bottle inside the children’s maze.
Dr. Carr-Jordan, a child development professor and a mother of four from Chandler, Ariz., has visited dozens of restaurant playgrounds in 11 states in recent months to test them for cleanliness. What the inspections and lab analyses have revealed is the widespread presence of an array of pathogens, from coliform bacteria to staphylococcus,...