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Vaccination takes advantage of one of the most impressive aspects of human biology — immunological memory.
When the immune system is exposed to viruses or bacteria, it can “remember” their specific features, making it easier to recognize and fight them later in life. Adaptive immunity involves two broad categories of responses to infections.
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The problem with low vaccination rates is that they disrupt herd immunity: vaccinating a sufficient number of individuals helps reduce the chances for a disease to spread through a population.
This means that even people who are not immune to the infection — including those who are not vaccinated as well as those for whom vaccinations do not provide complete immunity — are less likely to be infected if those around them are protected.