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. 2015 Aug;21(8):1480–1481. doi: 10.3201/eid2108.150284

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Relationship between vaccination coverage with >1 doses and the proportion of measles case-patients who had been vaccinated. The observed numbers of vaccinated case-patients can be used to infer the vaccination coverage for different populations. Of 62 (21.0%) measles case-patients with known vaccination status in California, USA, 13 had received >1 doses (6). Of 230 (13.0%) case-patients with known vaccination status in the United States during January–May 2014, a total of 30 had received >1 doses (7). Vaccine effectiveness is assumed to be 99% (3,4). The shaded areas for the countries of the European Union (EU) and European Economic Area (EEA), and Switzerland correspond to the 95% CIs. 95% CIs are omitted for California and the United States because of the small sample sizes.