There are many flu viruses, and they are always changing. As the flu virus is always changing, a new vaccine is made every six months to protect against strains that are likely to cause disease in the upcoming season. Six-monthly to yearly vaccination is required to provide up-to-date protection. Even when the vaccine does not exactly match these viruses, it may still provide some protection.
Only children ≥ six months old are eligible for the vaccine. This involves a single injection into the arm or thigh. However, younger children from six months to nine years old who are getting the vaccine for the first time will need two doses during a single flu season. The vaccine takes approximately two weeks to provide protection.
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