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How social media and a mumps outbreak teach us that vaccines build herd immunity

Mumps virus, pictured here, is usually preventable by vaccination.
The mumps virus, pictured here, has been spreading through Arkansas communities. Surprisingly, many affected people say they have received vaccinations to prevent it. Analyzing social media data helped a Boston Children’s Hospital team understand why so many people got sick.

Residents of Arkansas have been under siege by a viral threat that is typically preventable through vaccination. Since August 2016, more than 2,000 people have been stricken with mumps, an infection of the major salivary glands that causes uncomfortable facial swelling.

The disease is highly contagious but can usually be prevented by making sure that children (or adults) have had two doses of the measles-mumps-rubella (MMR) vaccine. But strangely, about 70 percent of people in Arkansas who got sick with mumps reported that they had received their two doses of the MMR vaccine.

So, members of the HealthMap lab, led by Chief Innovation Officer and director of the Computational Epidemiology Group at Boston Children’s Hospital, John Brownstein, PhD, asked, “Why did this outbreak take off?”

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