More than 140,000 people died from measles last year as the number of cases around the world surged once again, official estimates suggest.
Most of the lives cut short were children aged under five.
The situation has been described by health experts as staggering, an outrage, a tragedy and easily preventable with vaccines.
Huge progress has been made since the year 2000, but there is concern that incidence of measles is now edging up.
In 2018, the UK – along with Albania, the Czech Republic and Greece, lost their measles elimination status.
And 2019 could be even worse.
The US is reporting its highest number of cases for 25 years, while there are large outbreaks in the Democratic Republic of Congo, Madagascar and Ukraine.
The Pacific nation of Samoa has declared a state of emergency and unvaccinated families are hanging red flags outside their homes to help medical teams find them. -bbc