17) and check out how the unvaccinated chain of transmission initially started from a vaccinated person!!! Even though most of transmission chain later was unvaccinated—it started from a vaccinated person who kick started the chain of cases. I warned about this before July 4th. https://t.co/RUyqVssTSU

— Eric Feigl-Ding (@DrEricDing) July 30, 2021