Since 2017, cases of measles have surged fourfold to more than 20,000 people, the World Health Organization has warned. Experts say that the anti-vaccination movement is part of the reason for the resurgence.

Europe has seen a big surge in measles cases in 2017, which the World Health Organization says is a tragedy after a record low of 5,273 cases in 2016. Cases increased four-fold, with more than 20,000 people affected and 35 deaths.

Fifteen European region countries, including the UK, had large outbreaks. Measles cases were highest in Romania, Italy and Ukraine. People shunning vaccination is part of the problem, say experts.