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What causes breakthrough measles infections?

This version of What Causes Breakthrough Measles Infections 238074949645 - Breaking News | NBC News Clone was adapted by NBC News Clone to help readers digest key facts more efficiently.

01:12

More than 800 people in the U.S. have had measles since the start of 2025, according to NBC News data. The majority of cases are in West Texas, where an outbreak that shows no signs of abating, began in January. NBC News medical contributor Dr. Kavita Patel explains why a small number of people who are fully vaccinated may get sick during a large outbreak.

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