The flu vaccine is created using a vaccine that causes the virus to become inactive (essentially killing it) and thus unable to spread. Because vaccines are used to trigger an immune response to a virus, they are created using the same components that are found in the natural virus or bacteria. This may sound like risky business, but it is actually quite effective. There are four basic ways vaccines are made: by weakening the virus (measles, mumps, chicken pox), inactivating it (polio, flu, Hepatitis A), using a part of it (currently the Hepatitis B vaccine is the only one utilizing this method), and using part of the bacteria (e.g. diptheria, tetanus).
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