This isn't the first big vaccine rollout, and the past holds lessons for the pandemic present. Here's a look at how the polio vaccine overcame U.S. hesitancy.
With older adults vaccinated, doctors say a growing share of their COVID-19 patients are in their 20s, 30s, 40s and 50s, as more contagious variants circulate among people who are still unvaccinated.
The nation's top addiction scientist has teamed up with a prominent artist to let people know that substance use disorder is a disease, not a moral failure.
New coronavirus cases are at their lowest level since October. Some health experts think the vaccination campaign deserves credit for tamping down the U.S. outbreak. But will the downturn last?
Despite deaths and high infection rates, the parts of Ohio where the Amish live have the state's lowest vaccination rates. Most Amish aren't getting vaccinated; the few who do aren't open about it.
It's not a matter of vaccine hesitancy, say advocates. Instead, poorly located clinics, lack of flexible appointments and other barriers to access are hampering Philadelphia's hardest-hit communities.
Data from a Boston hospital showed that Latino patients who did not speak English well had a 35% greater risk of death from COVID-19. The hospital has added interpretation capacity.
Researchers say cocaine, meth and other street drugs are increasingly contaminated with deadly synthetic opioids, contributing to a major spike in deaths.
Experts fear steep declines in testing and diagnoses mean more people will contract HIV and die of AIDS. The problem is particularly acute in the South, the epicenter of the nation's HIV crisis.
The hope was that if people weren't out drinking, they wouldn't be spreading the coronavirus. There were unforeseen benefits to the ban, which ended last month — and negative impacts as well.
Syphilis cases in California have contributed to soaring national caseloads of sexually transmitted diseases. Experts point to the advent of dating apps, decreased condom use and an increase in meth.
A majority of white, rural conservatives in Tennessee are open to getting the vaccine at some point, but at least 45% won't consider it. Rates in Alabama, Georgia and Mississippi are also lagging.
From sporting arenas to colleges and cruise ships, many businesses are planning to ask customers to prove they've had their shots. Smartphone apps may be coming soon.
It's hard to track the rate of COVID-19 infections among Arab Americans, who are often counted as white on survey forms without a separate checkbox for Middle Eastern or North African origins.