08-18-2021, 06:44 PM
Data from the Mayo Clinic suggests that efficacy of the vaccines against nasal infection, including asymptomatic cases, has fallen from the original level of around 90% to 76% for the Moderna vaccine and 42% for the Pfizer vaccine since Delta’s emergence. At this rate, plan on getting your annual covid booster shot.
https://www.medrxiv.org/content/10.1101/...1.full.pdf
https://www.medrxiv.org/content/10.1101/...1.full.pdf