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With new testing requirements, it's not even clear how new Covid or flu shots can be made available this fall.

For months, the Harvard researcher Kseniia Petrova has challenged efforts to deport her to her native Russia for a customs violation. This week, the government charged her with a criminal felony.

Restrictions on payments to foreign partners may jeopardize studies of cancer and other conditions that would benefit Americans.

The technique used on a 9-month-old boy with a rare condition has the potential to help people with thousands of other uncommon genetic diseases.

The elimination of a key C.D.C. office has slashed funding to states for help lines used by thousands to stop smoking and vaping.

The progress comes as the Trump administration is proposing to cut funding for many programs believed to have contributed to the improvement.

Kseniia Petrova, a Harvard researcher, was detained Feb. 16 at Logan Airport after failing to declare scientific samples she carried into the U.S.

Robert F. Kennedy Jr. is expected to testify before lawmakers for the first time as health secretary on Wednesday, where he will also confront calls from a key Republican to reassure Americans about his agenda.

Experts predicted that artificial intelligence would steal radiology jobs. But at the Mayo Clinic, the technology has been more friend than foe.

The drugs treat disorders such as anxiety, panic attacks and insomnia, but stopping them abruptly can compound users' symptoms and even endanger their lives.