Two new studies draw on data from more than 12,000 patients to help figure out ways to battle antibiotic-resistant tuberculosis.

Though doctors and advocates have helped speed up access to the antiviral pills – of which the U.S. has enough to treat 1.7 million people – health providers are few and forms are still required.

Their prediction stemmed from the eradication of smallpox. Here's what they said more than three decades ago — and how it foreshadowed events of 2022.

Two years ago, on March 11, 2020, the World Health Organization declared a global pandemic. Now there's talk that we may be approaching a new stage for SARS-CoV-2. Let's unpack the word "endemic."

From the first vaccine (for smallpox) the questions have been the same. How do we transport it? Who's next to get it? Why so much hesitancy? The answers can be similar — or dramatically different.

That's when a vaccine for plague was invented — and authorities began to consider requiring proof of vaccination before visiting pilgrimage sites in India. The debate has raged ever since.

In 1721, London was in the grips of a deadly smallpox epidemic. One woman learned how to stop it, but her solution sowed political division.