Yeesh. After surveying 275 reusable gastrointestinal endoscopes from U.S. hospitals, researchers found that 15 percent aren't up to cleanliness standards.

Gastrointestinal endoscopes carry cameras into the small intestine, stomach or colon, to help doctors examine those areas. As you can imagine, they get pretty dirty. If they're not well cleaned, they can transmit microbes and other biological matter between people.

Researchers from the technology company 3M gathered endoscopes from five U.S. hospitals. They found different numbers of substandard cleaning for different types of scopes.