US measles resurgence (1989-1991)
The US recorded about 55,000 measles cases and 123 deaths, concentrated among unvaccinated preschool children in poor urban areas. Coverage had stagnated near 60-80% because vaccination cost money many families could not pay.
The outbreak prompted the federal Vaccines for Children program in 1993, which provided free vaccines to uninsured children. Coverage climbed above 90% within years.
Measles was declared eliminated in the US in 2000, a status now under pressure again.
It shows coverage gaps in a wealthy country become large outbreaks, and that targeted federal policy can close them.
