A week ago, only two laboratories in Africa could diagnose the novel coronavirus that originated in China and is rapidly spreading around the world. As of Sunday, the World Health Organization (WHO) expected every nation in Africa to be able to diagnose the disease.

The rush reflects a global push for diagnostic capabilities, particularly in developing countries, in hopes of averting a global pandemic. But it is being slowed by a desperate need for virus samples necessary to validate the tests.

"Without vital diagnostic capacity, countries are in the dark as to how far and wide the virus has spread and who has coronavirus or another disease with similar symptoms," WHO chief Tedros Adhanom Ghebreyesus told a news conference in Geneva on Monday.