Executives Depart Cassava, Maker of Disputed Alzheimer’s Drug

Executives Depart Cassava, Maker of Disputed Alzheimer’s Drug

The chief executive and a lead scientist stepped down weeks after a federal grand jury filed fraud charges against a research collaborator.
New Covid Shots Recommended for Americans 6 Months and Older This Fall

New Covid Shots Recommended for Americans 6 Months and Older This Fall

As the virus continues to mutate, scientific advisers to the C.D.C. are urging Americans to roll up their sleeves again for annual vaccinations.