How do vaccines prevent disease — even among people too young to get vaccinated?
It’s a concept called “herd immunity,” and it relies on a critical mass of people getting their shots to break the chain of infection. Health researcher Romina Libster shows how herd immunity contained a deadly outbreak of H1N1 in her hometown.
Today we have TOOLS (vaccines) that can protect the lives of the most vulnerable people. Why some people still refuse to use them?
