What is the highest reported number of measles cases since 1996?

Updated: Jun 06, 2019
  • Author: Selina SP Chen, MD, MPH; Chief Editor: Russell W Steele, MD  more...
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In the period from January 1 to May 20, 2011, a total of 118 cases were reported to the CDC; this represents the highest reported number of measles cases for the same period since 1996. [22] Of the 118 cases, 105 (89%) were associated with importation; the source of the remaining 13 cases could not be ascertained. In all, 105 (89%) of the 118 patients were unvaccinated; 24 (20%) were persons 12 months to 19 years of age whose parents claimed a religious or personal exemption.

Approximately half of the 118 cases—58, or 49%—were accounted for by 9 outbreaks. The largest of these outbreaks involved 21 persons in Minnesota, in a setting where parental concerns about the safety of measles, mumps, and rubella (MMR) vaccine caused many children to go unvaccinated. [23] As a result of this outbreak, many persons were exposed, and at least 7 infants too young to receive MMR vaccine were infected.

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