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New Experimental Therapy for A.L.S. Approved in Canada

Ivermectin Does Not Shorten Recovery Time From Covid, Study Finds

A new study is the first to document likely cat-to-human virus transmission, but risks are low overall, experts say.

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

Blood Tests That Detect Cancers Create Risks for Those Who Use Them

Even with federal funds, U.S. schools still rely on low-cost methods to slow Covid, a study shows.

F.D.A. advisers will weigh in on Covid shots by Novavax, a latecomer in the vaccine race.