Only for a few hours though, not 2 weeks+, and viruses don't mutate on a doorknob. Someone who got vaccine and falls in the ineffective category will likely not

Only for a few hours though, not 2 weeks+, and viruses don't mutate on a doorknob. Someone who got vaccine and falls in the ineffective category will likely not die but will be a spreader for a few weeks, with some nonzero probability of mutation, and that times 1/3 of the population that got the vaccine would give the virus a lot of opportunity to mutate.