THURSDAY, May 30, 2019 (HealthDay News) — The anti-vaccination controversy in the United States has been boosted by Russian Twitter trolls, according to a new study.

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It found that they posted about the issue far more than the average Twitter user last year, using “sophisticated” bots to share opinions from both sides of the vaccination debate, CBS News reported.

The trolls’ activities are similar to those used in the past to heat up controversial issues in the United States by amplifying different opinions, the George Washington University researchers said.

Tech companies have clamped down on the spread of misinformation surrounding vaccinations, CBS News reported.

The United States is struggling with its worst measles outbreak in 25 years and health officials say misinformation from anti-vaxxers has contributed to the problem.

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