the studies have shown that the vax blocks transmission in over 90% of cases. Sooo, if you are close contact exposed to 10 positive people on a bad day, you are protected for 9 of them. The studies have also shown that if the virus does break through and infect, in 100% of such cases there is no serious illness or death. I like those odds, but I see why caution is still being urged. Mandates need to go though when everyone has a chance to get it.