SEATTLE -- U.S. researchers gave the first shot to the first person in a test of an experimental coronavirus vaccine Monday -- leading off a worldwide hunt for protection even as the pandemic surges.

Dear N.W.: Recent studies seem to suggest that getting the COVID-19 vaccine in the same arm as previous vaccines leads to ...

The CDC is warning against using commercial tests to determine immunity. A Centers for Disease Control and Prevention panel once again reminded consumers this week not to use commercial antibody tests ...

I have notes from friends at home who are getting their COVID vaccines and high-dose flu shots on the same day in the same arm. They talk about being completely wiped out and the cons of having two ...