Rwandan authorities close the border with the Ebola-hit Congolese city of Goma for everyone other than Congolese citizens leaving Rwanda, as a third case was confirmed in Goma.

The Zika virus may be particularly adept at entrenching itself in parts of the body that are shielded from the immune system, making it harder to fight off and possibly lengthening the timeframe in which it can be transmitted, top US experts say.

Sierra Leone officials confirm a death from Ebola, hours after the World Health Organization declared the latest West Africa outbreak over.

The World Health Organization's failure to sound the alarm until months into West Africa's Ebola outbreak was an "egregious failure" which added to the enormous suffering and death toll, global health experts say.

The World Health Organization's failure to sound the alarm until months into West Africa's Ebola outbreak was an "egregious failure" which added to the enormous suffering and death toll, global health experts say.

The World Health Organization (WHO) has declared Liberia free of the Ebola virus, as the country has had no new cases in 42 days.