3 ms·
What does that mean? The polio vaccine is considered 100% effective at 4 doses while 90% at 2. Does a vaccine have to hit 100% effectiveness at some number of d
by SigmundA 5y ago
What does that mean? The polio vaccine is considered 100% effective at 4 doses while 90% at 2. Does a vaccine have to hit 100% effectiveness at some number of doses to be considered a cure?