evidence: In a stunning reflection of the efficacy of vaccines and an indication of the impact that widespread inoculation could have, an analysis of government data published Thursday by the Associated Press found nearly all Covid-19 deaths in the U.S. last month were among people who weren’t vaccinated against the virus. Center for Disease Control and Prevention data reviewed by AP showed just 150 of the more than 18,000 Covid-19 deaths in May resulted from "breakthrough" infections in fully vaccinated people. In other words, 99.2% of the people who died from Covid-19 last month weren’t fully vaccinated against the virus.