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Delaware Confirms First Positive Measles Case in Over a Decade

Health officials are tracing contacts and urging residents to check vaccination status as the MMR vaccine is 97% effective after two doses.

  • On Monday, the Delaware Division of Public Health confirmed the state's first measles case in more than 10 years, identifying an unvaccinated adult male in Kent County.
  • The highly contagious virus spreads through airborne droplets when an infected person breathes, coughs, or sneezes, remaining infectious in the air for up to two hours after exposure.
  • While the measles, mumps and rubella vaccine is 97% effective after two doses, outbreaks are rising regionally; Pennsylvania grapples with its biggest outbreak in 30 years, recording 102 cases since April.
  • DPH is urging Delawareans to verify their vaccination status via the DelVAX Public Portal or by contacting primary care providers for records they cannot access online.
  • Residents experiencing potential symptoms should contact a health care provider before arriving at medical facilities to notify staff and prevent further exposure to the virus.
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NBC Philadelphia broke the news in Philadelphia, United States on Monday, July 20, 2026.
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