Yes, Israel reinstated its mask mandate immediately after they saw cases rise a month ago and their own studies indicated the delta variant was impacting vaccin

Yes, Israel reinstated its mask mandate immediately after they saw cases rise a month ago and their own studies indicated the delta variant was impacting vaccine efficacy or even transmitting from vaccinated persons: https://www.timesofisrael.com/israel-to-reinstate-indoor-mask-mandate-next-week-as-covid-19-cases-keep-rising/ https://www.timesofisrael.com/israel-to-reinstate-indoor-mas... Much of the data in this CDC slide deck is actually from these Israeli studies. I will also note Israel has already approved a third dose of mRNA booster shots for 60+ year old people based on the data they have seen with waning efficacy. The CDC as of now currently says boosters are not necessary for Americans "at this time"...