Since December a quiet crisis has been rumbling in Angola.
A crisis that is now threatening to get out of control.
What started out in pockets of the capital, Luanda, has now spread to large swathes of the country.
Angola’s neighbour to the north – the Democratic Republic of the Congo – has recently declared an epidemic in three provinces.
There are now real fears it could spread still further.
What is this crisis caused by?
A virus prevented by a single inoculation.