Parents opt for a second shot of the vaccine sooner. It aligns with guidance in germany, the uk and france measles cases. The second dose of the mMR vaccine can be given four weeks after first.
Evidence shows vaccines still work well at early ages. Recommendation to give the dose between four and six years based on logistical concerns.
Infants should receive a third dose if they receive the first dose early. It's possible the baby still has maternal antibodies and thus doesn't establish a strong response. The second MMR shot is different than other boosters.
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