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To the Editor In a Research Letter recently published in JAMA Pediatrics, Majumder et al1 relied on historical estimates of the basic reproductive number (R0) for measles from the prevaccination era, the effective reproductive number (RE) during the 2015 measles outbreak using cumulative incidence data, the rate of immunity (I), the rate of vaccine effectiveness (VE), and the following equation to estimate the vaccination rate of the exposed population (V):
Bogardus T. Vaccination Compliance and the US Measles Epidemic. JAMA Pediatr. 2015;169(9):876. doi:10.1001/jamapediatrics.2015.1524