CDC Fact: What happens when some people don’t get vaccinated? Even a small number of unvaccinated people can make it much easier for a disease to spread. To explain this phenomenon, scientists often refer to herd or community immunity, a coverage threshold that effectively prevents an illness from spreading. If no one is immunized, a disease can easily bounce from person to person until it reaches everyone. If some people are immunized, the immunized people act like buffers that prevent a disease from spreading through them. If enough people are immunized, the buffers essentially become impenetrable and a disease cant realistically spread at all.
Posted on: Tue, 27 Jan 2015 06:01:56 +0000
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