Nearly two-thirds of US measles cases this year have come from 3 outbreaks that occurred after the illness was introduced into communities with pockets of residents who weren’t vaccinated because of religious or philosophical beliefs.
In the Morbidity and Mortality Weekly Report, investigators noted that 159 measles cases were reported in 16 states and New York City this year between January 1 and August 24. The figure rivals some of the highest case numbers reported in recent years. In 2011, 220 cases were reported and 140 were reported in 2008. During 2001 to 2012, the median number of US measles cases was 60 per year.
Imported Cases, Vaccine Exemptions Threaten US Measles Elimination. JAMA. 2013;310(18):1914. doi:10.1001/jama.2013.280670