Marie McCullough

Packers QB Aaron Rodgers revealed in an interview that he was taking ivermectin to fight COVID. But research data on its effectiveness against the virus are still scarce.

Local Catholics out for Mass on Sunday sounded happy that Philadelphia Archbishop Nelson Pérez has reinstated the religious obligation to attend Mass in person starting next month, ending

Big Tobacco lied for decades about the deadly effects of cigarettes. Is history repeating with e-cigarettes?

For some immune-compromised people, the pandemic may never be over

Can a lame-duck administration inject new life into the COVID-19 vaccine rollout? Eight days will tell.

The first confirmed case of an American who got COVID-19 twice adds to scant but mounting evidence that people can be reinfected with the coronavirus—and get sicker than during the initial bout.

Even Twitter says President Trump’s claim of immunity is misleading.

Airborne transmission is what made measles so wildly contagious before the vaccine. Can the coronavirus stay aloft in the air?

Merck has the technology, money, and record of success to develop a coronavirus vaccine. It will also need luck.

There are no clear national guidelines for how coronavirus testing data should be reported, so federal and state numbers are inconsistent, confusing, and potentially misleading.