As measles was declared eliminated in the US in 2000, health experts advised two MMR vaccine doses for children. However, due to declining vaccination rates and rising cases, experts now recommend an early dose for infants traveling domestically to areas with low herd immunity. The first dose is typically given at 12-15 months, but an additional early dose (for infants 6-11 months) can boost protection, as maternal antibodies may interfere with vaccine effectiveness. This change in recommendation highlights the need for vigilance in preventing outbreaks, as the US faces challenges similar to areas with lower vaccination coverage.
With some local immunization levels inadequate to avert outbreaks and ongoing disease spread in various regions of the country, experts urge an early MMR dose for infants.
The early dose offers critical protection during the vulnerable 6-to-11-month period, particularly as herd immunity levels in the US decline.
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