Months into a pandemic that has caused more than 500,000 deaths worldwide, scientists are still trying to answer crucial questions about the coronavirus. Chief among them: everything about ...

A cough or sneeze in the checkout line at the grocery store may elicit fear of COVID-19, but that maskless person quietly sitting next to you on the subway could pose just as much of a threat, public ...

There are usually a few indicators when you're sick. It's common to feel noticeable symptoms with any illness, such as a fever, headache, shortness of breath, stomach or chest pain, and coughing or ...

Asymptomatic diseases are where a disease or infection does not lead to any symptoms. Some people will remain asymptomatic throughout their disease course, whereas others will eventually become ...