Question

Is the vaccine effective ?

Answer 1

It depends which vaccine is asked about.

Answer 2

A 2012 meta-analysis found that flu vaccination was effective 67 percent of the time; the populations that benefited the most were HIV-positive adults aged 18 to 55 (76 percent), healthy adults aged 18 to 46 (approximately 70 percent), and healthy children aged six months to 24 months (66 percent).

Step-by-step explanation:

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