The results provide what experts say is the strongest evidence yet that removing sticky amyloid plaques from the brain benefits patients with the fatal disease.
As China begins to experience a spike in infections, fears are growing that coronavirus cases could sweep across its 1.4 billion population during the Lunar New Year holiday.
Pfizer said final trial results showed that its treatment reduced the chance of hospitalization or death by 89%, while Merck said their pill reduced those chances by 30%.
The drug was authorized based on evidence that it can reduce brain plaques, a likely contributor to Alzheimer's, rather than proof that it slows progression of the disease.
Nearly 30 doctors around the world, from New Orleans to London to Dubai, said in interviews that they feel more prepared should cases surge again in the fall.
