Have you herd?

How does community immunity work? Germs can travel quickly through a community and make a lot of people sick. If enough people get sick, it can lead to an outbreak. But when enough people are vaccinated against a certain disease, the germs can’t travel as easily from person to person — and the entire community is less likely to get the disease. That means even people who can’t get vaccinated will have some protection from getting sick. And if a person does get sick, there’s le...
More