Being fully vaccinated against COVID-19 does not make you safe against transmitting the virus to others, so what's the point of a vaccine mandate? Unlike the classic childhood mumps, measles, rubella (MMR) vaccine, which prevents measles with 97% efficacy, the COVID "vaccine" is different — the Pfizer-BioNTech vaccine is 95% effective against symptomatic COVID-19 infection. The measles vaccine is expected to give lifelong protection against measles — meaning you're now free from getting or spreading measles. Prior to general use, the Pfizer mRNA COVID vaccine demonstrated two months of protection against symptomatic COVID-19.