Five years after Donald Trump declared a national COVID emergency, here's what the research says about face masks.

Masks were one of the most polarizing parts of the COVID pandemic. Five years later, have we moved closer to a compromise?

In a single week, 6,900 New Yorkers died of COVID-19, one month after it was declared a pandemic on March 11, 2020.

Wearing respirator masks (for example, N95) is highly effective, particularly in confined indoor environments such as public ...