Measles Immunity: Pre-1957 Births & Current Outbreak Analysis
Measles Immunity: Pre-1957 Births & Current Outbreak Analysis
Colorado’s measles cases have doubled the past decade’s total, reaching 12 in early June. This surge prompts questions about immunity for those who contracted measles before widespread vaccination.
Individuals born before 1957 are generally considered immune due to near-universal natural infection. Measles infection provides lifelong immunity in almost all cases. However, those unsure of prior infection should consult their vaccination records or undergo an antibody test.
The Colorado Department of Public Health and Environment and the CDC advise that receiving another MMR vaccine dose poses no harm, even if already immune. The CDC recommends two doses for lifetime protection, although 5 of Colorado’s 12 cases involved individuals with two MMR vaccine doses.
Current US measles cases total 1,168, with 17 outbreaks (≥3 related cases). Texas accounts for the majority of cases (~700). 95% of those infected are unvaccinated or have unknown vaccination status. Most Colorado cases are linked to a Turkish Airlines flight. The CDC advises against travel if sick and recommends MMR vaccination at least two weeks before international travel.
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