webmd.com
Some people with COVID-19 are having symptoms for more than 4 weeks after infection. In some cases, they start to feel better and then have a setback. Here’s what we know.
over 2 years ago
webmd.com
Scientists are developing a new device to check breath for hydrogen sulfide, the
gas that prompts the unpleasant smell from the mouth.
over 2 years ago
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