Study shows dramatic decline in effectiveness of all 3 COVID-19 vaccines over time | Honolulu Star-Advertiser

Study shows dramatic decline in effectiveness of all 3 COVID-19 vaccines over time | Honolulu Star-Advertiser: As the Delta variant became the dominant strain of coronavirus across the United States, all three COVID-19 vaccines available to Americans lost some of their protective power, with vaccine efficacy among a large group of veterans dropping between 35% and 85%, according to a new study.