Comment on BART rider with measles potentially exposed thousands in Bay areaparentComments−carbocation12yThe effect of most vaccines wanes with time; however, because most people receive them, even those with waning or no resistance gain benefit (herd immunity). In this circumstance, though, once you're directly exposed, you're at risk.
Comments
The effect of most vaccines wanes with time; however, because most people receive them, even those with waning or no resistance gain benefit (herd immunity). In this circumstance, though, once you're directly exposed, you're at risk.