3 ms·
The old oral polio vaccine (Sabin) didn't provide lifetime immunity like the newer injection. (Reading about the immunities both confer, I'm not clear on the di
by andrewf 5y ago
The old oral polio vaccine (Sabin) didn't provide lifetime immunity like the newer injection. (Reading about the immunities both confer, I'm not clear on the distinction between "gut immunity" preventing asymptomatic shedding, versus "immunity" that prevents the virus from causing serious nervous system disease)