quote [ Troll accounts that tried to influence the US election also tweeted about vaccines, a study says.

Many posted both pro- and anti-vaccination messages to create "false equivalency", the study found. It examined thousands of tweets sent between 2014 and 2017. Vaccination was being used by trolls and sophisticated bots as a "wedge issue", said Mark Dredze from Johns Hopkins University. "By playing both sides, they erode public trust in vaccination, exposing us all to the risk of infectious diseases," he said. ]