Efficacy of fourth Pfizer COVID vaccine wanes by 6 months in healthcare worker study … No notice on COVID public health emergency deadline means likely extension … COVID vaccine acceptance pays off in new flu shot uptake, study finds … Roche’s gantenerumab fails to slow Alzheimer’s across two key trials … CDC: COVID variants BQ.1 and BQ.1.1 make up 44% of U.S. cases
