The number of cases — and deaths — in Bangladesh is staggering. As of Sunday, 528 have died, mostly children. How did this measles outbreak begin? And how is the country responding?

DHAKA, Bangladesh: A measles outbreak in Bangladesh has killed more than 500 children, government data showed Saturday (May 23), marking the country's deadliest surge in decades…

Most cases recorded by doctors among children aged between six months and five years.