In the era when people traveled by sailing ship and steamer, illnesses usually burned themselves out before boats reached shore, a new study finds.

The outbreak may be the first ever documented in marine mammals.

A large study showed that for most patients, having both breasts removed after cancer was detected in one made no difference.

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.

Progress in the quest to help progeria patients suggests that gene editing techniques may help treat other ultrarare conditions.

Researchers are only beginning to understand why some people embrace retirement while others won?t even consider it.

As patients consider drugs like Wegovy, Ozempic, Zepbound and Mounjaro to treat obesity, experts say the choices are not so simple.

In the first two years of the pandemic, the rate of long Covid was starkly lower among people who were vaccinated, researchers reported.

A new study adds to evidence that the shots can reduce the chances of developing one of the most dreaded consequences of Covid.

Wildfire smoke from the Western United States and Canada is blowing across the Northeast, lowering air quality and endangering vulnerable populations.

Many other conditions have similar symptoms, experts say, so avoid the pull of self-diagnosis.

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.

The federal Centers for Disease Control and Prevention said 28 people had been hospitalized with listeria infections across a dozen states.

Officials found no evidence of silent infections in 35 Michigan dairy workers, but experts noted that much more data was necessary.

The chief executive and a lead scientist stepped down weeks after a federal grand jury filed fraud charges against a research collaborator.

A Public Health Service employee, he turned whistle-blower after learning of decades-long research involving hundreds of poor, infected Black men who were left untreated.

A common antibiotic, doxycycline, greatly reduced cases of syphilis, gonorrhea and chlamydia when taken every day, a study found.

A small new study shows reactions in the brain in people who were given psilocybin in a controlled setting.

A study of more than a million Danes found that frequent moves in childhood had a bigger effect than poverty on adult mental health risk.

Even as the H5N1 virus evolves, gaps remain in the nation?s contingency plans for human testing, scientists say.

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