It's still too early to recommend that everyone don eyeglasses, goggles or face shields in public to protect against COVID-19.
People who tested positive for COVID-19 were twice as likely to report dining at a restaurant before becoming sick than people who tested negative.
The vaccine has been approved for emergency use in medical workers, customs and border officials and other high risk groups.
The test doesn't require any proprietary equipment or technology, meaning designated laboratories could follow a specific protocol to conduct their own tests.
The new findings "highlight the broad impact of the pandemic and the need to prevent and treat these conditions," the authors wrote.
A new study analyzed information from thousands of passengers who traveled on China's high-speed trains.