Epidemiology

Undercounting or ignoring cases of the disease on the continent could lead to new variants that might derail efforts to end the pandemic

On the anniversary of this global disaster, we take a look back at some of the biggest mistakes, surprising successes and lingering questions

Lessons from other viruses show that even if vaccines don’t completely stop disease spread, they can still successfully contain it

Experts suggest limiting travel and keeping Thanksgiving and other celebrations small and outdoors

Nirav Shah directs Maine’s response, which is seeing impressive results despite risk factors

As few as 10 percent of infected people may drive a whopping 80 percent of cases in specific types of situations

Public health specialist and physician Camara Phyllis Jones talks about ways that jobs, communities and health care leave Black Americans more exposed and less protected

Wuhan-based virologist Shi Zhengli has identified dozens of deadly SARS-like viruses in bat caves, and she warns there are more out there

The virus that causes COVID-19 can persist in aerosol form, some studies suggest. But the potential for transmission depends on many factors, including infectiousness, dose and ventilation

A hotter planet could change the relationship among infectious agents, their hosts and the human body’s defense mechanisms

Groups of scientists tasked with identifying pandemic-prone microbes were stretched too far and thin

Columbia University professor W. Ian Lipkin looks for lessons from the new disease COVID-19 to prevent the next disaster