2) Gets worse, 🇮🇱 report also reveals waning potency, showing just 16% effectiveness against transmission among those 2nd-shot vaccinated in January, 44% VE if vaccinated in February, 67% VE if 2nd shot in March, 75% if vaccinated in April. Partly also age effect—but still bad. pic.twitter.com/Oh9eX6AGH5

— Eric Feigl-Ding (@DrEricDing) July 23, 2021