[A] devastating measles outbreak in Bangladesh.

Since the virus took off in mid-March, the country has tallied more than 60,000 suspected cases and 528 suspected measles-related deaths. The vast majority of the sick and dead are children under age 5.

It sounds like part of the issue is health care capacity:

Her worried parents, like many other families, took her to the capital, Dhaka, where hospitals have the capacity to care for patients with a severe case. The journey took several hours. But once there, the child was turned away by two facilities already overwhelmed by the crush of measles patients.

And also a large unvaccinated group of young kids due to political change disrupting things — probably worth a read to understand the various factors.