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The annual flu jab is different each year, rearranging the H and N antigen. You might heard of the H1N1 swine flu and the H5N1 avian flu.
Booster shots are done no more than three times for other viral illnesses, such as the MMR mumps measles rubella Vaccine or hepB vaccine.
If the content of the vaccine didn’t change, it should be considered a fourth shot, where currently only have been widely implemented in Israel.
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