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The notion that the virus sets up shop in the mouth and produces enough antigen to be picked up by todays technology, he said, is far-fetched. The two companies pursued saliva (or oral fluids, in the case of OraSure) for months in the hopes of their tests being more comfortable than swabs, some of which go painfully deep into the nose, and less reliant on sputtering supply chains that have caused long delays for laboratory tests

"We can't be healthy without a healthy environment," says Ryan Kennedy, an associate professor in the Department of Health, Behavior and Society who co-authored one of the new studies

Surgical removal of cancer is often needed, and parts of the face, tongue, cheek, or lip must often be removed too