Going viral: Measles spreads, but pro-vax messages gain ground by lisabelkin
The internet — the place where the anti-vaccine message gained traction in the first place — might be turning in favor of vaccines, a preliminary study suggests.
By tracking Twitter hashtags, he and graduate student Pik-Mai Hui have concluded that “pro-vax information and activity is beginning to push back against, and even overtake, anti-vax disinformation.” Vaccinations do not protect only the person who receives them. They also protect those in the population who for medical reasons, such as impaired immunity, cannot be inoculated. The mathematics of so-called herd immunity show that if 96 percent of the population is vaccinated against the measles, then it is essentially eradicated, because the virus has no place to spread. That is why the disease was declared eliminated in the U.S. in 2000.
While the CDC has been counting cases, Menczer and Hui have been measuring the flow of information. From September 2016 through September 2018, they analyzed a random sampling of more than 40,000 tweets that contained the most frequently used pro- and anti-vax hashtags. They then classified the nearly 30,000 accounts that generated those tweets as either pro-vax or anti-vax and created virtual maps, with pro-vax accounts represented by blue dots and anti-vax ones by green.
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