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news.yahoo.com...
The vaccine was initially aimed at high school and college students because the disease is more dangerous for adolescents and can easily spread in crowded conditions, like dorm rooms. Three years ago, the Advisory Committee on Immunization Practices said the vaccine should be offered to children ages 11 and 12. They believed the shot was effective for at least 10 years.
But the panel was told Wednesday that studies show the vaccine works for less than five years.
The committee debated adding a booster shot or simply push back the timing of the single dose to age 14 or 15. In the end, they voted for a booster dose at age 16, concluding it would be easier and less confusing to add a second dose after five years.