Our World in Data, an online publication based at the University of Oxford, announced on Tuesday that it had stopped relying on World Health Organization (WHO) data for its models, citing errors and other factors.

The group's founder, Max Roser, said researchers are now using data from the European Centre for Disease Prevention and Control.

Until March 18 we relied on the World Health Organization (WHO) as our source. We aimed to rely on the WHO as they are the international agency with the mandate to provide official estimates on the pandemic. The WHO reports this data for each single day and they can be found here at the WHO's site.

Since March 18 it became unfortunately impossible to rely on the WHO data to understand how the pandemic is developing over time. With Situation Report 58 the WHO shifted the reporting cutoff time from 0900 CET to 0000 CET. This means that comparability is compromised because there is an overlap between these two WHO data publications (Situation Reports 57 and 58).