Vaccination is important to help your immune system recognize foreign matter that can cause illness. Vaccines inject dead virus or other material that help give you immunity to that virus or disease should you come in contact with it later. Another reason it is important for vaccinating large populations is that it helps to wipe out disease. The more people that get vaccinated, the fewer there are who will get sick. When we get sick with things like the flu, we turn into a great host for the virus to replicate and propagate to our friends and neighbors who come in contact with our sneezes or the door knobs we leave virus particles on.
Vaccination is important means of protection against many harmful and potentially deadly diseases. Small pox, H1N1, and many other illnesses can be prevented through vaccination.
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