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Some Older Women Need Extra Breast Scans. Why Won’t Medicare Pay?

Following Measles Outbreaks, Officials Grow Wary of Renewed Threat

Older Americans Should Get Another Covid Shot This Spring, Panel Says

C.D.C. Considers Ending 5-Day Isolation Period for Covid

H.I.V. Groups Warn of Privacy Risks in How C.D.C. Tracks Virus Samples

Climate Change Drives New Cases of Malaria, Complicating Efforts to Fight the Disease

What to Know About Dengue Fever as Cases Spread to New Places

Scientists Offer a New Explanation for Long Covid

Wastewater Data Mirrored Covid Case Counts During First Omicron Wave

African Countries Made Huge Gains in Life Expectancy. Now That Could Be Erased.

For Many Older Americans, the Pandemic Is Not Over

Don’t Blame Monkeys for Monkeypox, W.H.O. Says After Attacks

C.D.C. Dismisses Airborne Transmission of Monkeypox. Some Experts Disagree.

Where Death Rates Rose the Most During the Pandemic

The Coronavirus Has Infected More Than Half of Americans, the C.D.C. Reports

More than half of Americans have been infected with the coronavirus at least once, the C.D.C. says.

Most Americans have been infected with the coronavirus at least once, the C.D.C. says.

Trying to Solve a Covid Mystery: Africa’s Low Death Rates

The C.D.C. no longer recommends universal case investigation and contact tracing.

U.S. caseloads fall below the Delta peak.