FROM MARCH 1 through May 31, 1989, 19 confirmed measles cases* occurred in a health district in Washington (district attack rate: 26 cases per 100,000 population). No measles cases had been reported in the district since 1983. The index patient was an unvaccinated 3-year-old girl; five generations of cases followed:
Nine patients were <5 years of age, including five who were <16 months of age; eight were 5-19 years of age; and two were >19 years of age. Eleven cases were in Hispanics (384 per 100,000 population**), and eight were in non-Hispanic whites (11 per 100,000**).
Three cases occurred in children vaccinated before the outbreak at >15 months of age. Twelve patients had never been vaccinated; of these, five were <15 months of age, four had not received vaccine as recommended***, two had religious exemptions, and one was born before 1957.
Four cases were in children vaccinated during the outbreak.
Measles Outbreak—Washington, 1989: Failure of Delayed Postexposure Prophylaxis with Vaccine. Arch Dermatol. 1990;126(11):1412-1413. doi:10.1001/archderm.1990.01670350022002