For Epidemics to Cross Oceans, Viruses on Ships Had to Beat the Odds
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In the era when people traveled by sailing ship and steamer, illnesses usually burned themselves out before boats reached shore, a new study finds.
Rabies is Spreading in South African Seals, Scientists Say
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The outbreak may be the first ever documented in marine mammals.
Western Wildfire Smoke Reaches the East Coast
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Wildfire smoke from the Western United States and Canada is blowing across the Northeast, lowering air quality and endangering vulnerable populations.
Breast Cancer Survival Not Boosted by Double Mastectomy, Study Says
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A large study showed that for most patients, having both breasts removed after cancer was detected in one made no difference.
Halting the Bird Flu Outbreak in Cows May Require Thinking Beyond Milk
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A new study paints a complex picture of the outbreak, suggesting that the virus could be spreading in multiple ways and that it is not always mild in cows.
A Disease That Makes Children Age Rapidly Gets Closer to a Cure
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Progress in the quest to help progeria patients suggests that gene editing techniques may help treat other ultrarare conditions.
Anxiety, Depression and Other Disorders Can Look Like A.D.H.D.
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Many other conditions have similar symptoms, experts say, so avoid the pull of self-diagnosis.
Biden and Georgia Are Waging a Fight Over Medicaid and the Future of Obamacare
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A fierce battle with Georgia over a Medicaid experiment with stricter enrollment underscores the vast divide between parties over how to cover lower-income Americans.
Listeria Outbreak Tied to Deli-Sliced Meat Kills at Least 2, C.D.C. Says
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The federal Centers for Disease Control and Prevention said 28 people had been hospitalized with listeria infections across a dozen states.
Is Bird Flu Spreading Widely to Farm Workers? A Small Study Offers Some Reassurance
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Officials found no evidence of silent infections in 35 Michigan dairy workers, but experts noted that much more data was necessary.