The latest stage of an emergency vaccination campaign has been launched in the Democratic Republic of Congo to combat a measles outbreak that has killed over 3,500 people this year.
The World Health Organization (WHO) and the Congolese government aim to vaccinate almost a million children across the country in just over a week.
The UN agency describes the measles epidemic in DR Congo as the largest and fastest-moving in the world.
It has killed more Congolese people this year than Ebola.
Lack of routine access to vaccinations and health care has contributed to the problem.
Elsewhere in the world, widely discredited theories opposing vaccination have lead to a resurgence of one of the most contagious viruses.