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Measles is back in the United States. This totally preventable disease was eradicated in 2000 but has returned in the last decade. More people have contracted measles in the first three months of 2019 than in the whole of 2018. But epidemics do not occur everywhere in the United States – they occur in specific groups of people.
Anti-vaccination misinformation may result in a decline in the number of children vaccinated. And when fewer children are vaccinated, a community may lose its "collective immunity". When this happens, especially in small, tight communities, measles can spread like wildfire. Seventy-five percent of all recent measles cases have occurred in these small communities.
For everyone to be protected against measles, anyone who can get vaccinated must do so. But most states allow parents not to vaccinate their children for whatever reason, allowing measles to escalate.
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