On Friday afternoon, the WHO director general - Tedros Adhanom Ghebreyesus told a daily briefing in Geneva that "We are now on the verge of reaching 100,000 confirmed cases".
But other organisations - including news agencies such as Reuters and AFP, are keeping their own tallies by adding up figures given by various national and state health officials. Both these news agencies are now reporting that the total number of infections has passed 100,000.
At Johns Hopkins University in the US, researchers are maintaining an interactive web-based dashboard to track the outbreak in real time.
They also calculate that more than 100,000 people have been infected, and more than 3,400 have died across the world.