Why do some still refuse to get the measles jab?

The World Health Organisation has listed vaccine hesitancy as one of the top 10 threats to global health in 2019.The US is having its biggest measles outbreak in 25 years, while there have been several reported outbreaks of the disease in recent years in the UK.More than half a million children in the UK were unvaccinated against measles between 2010 and 2017, according to figures released by Unicef.