The variant found in Quebec, XFG, has been spreading across Europe, the United States and other Canadian provinces.

The fear didn’t come from outside, from the dark or from some monster in the closet. It came from within. From the air. From ...

The US Department of Health and Human Services is terminating a contract with drugmaker Moderna to develop a vaccine to ...

The Trump administration on Wednesday canceled a $766 million contract with Moderna that funded efforts to develop a vaccine ...

The tests detect different parts of the Covid virus and vary in sensitivity. Molecular tests are more sensitive, meaning they require a lower amount of virus in a sample to detect a positive result.

Noé Crespo, a professor of public health at San Diego State University, was on the verge of cracking a question he had spent ...