coronavirus July 29, 2021 6:32 am Pfizer COVID-19 Vaccine's Effectiveness Drops After Six Months Pfizer’s COVID-19 Vaccine’s Effectiveness Drops After Six Months A new study suggests the Pfizer COVID-19 vaccine loses some of its effectiveness after 6 months. Bob Redell reports. US & World Videos 2:24 In the news: Freeway shootings, ‘California Forever' plan moves forward, good Samaritans 3:53 Tensions, protests grow over Israel-Hamas War 1:48 Bay Area food banks deal with critical shortage 2:19 Suspect arrested for operating brothel in San Jose 2:25 San Francisco mayoral candidate proposes university campus to revitalize downtown
