As part of the World Health Organisation’s (WHO) Emergency Response Framework [2nd Ed 2017] an Incident Management System (IMS) was activated across the three levels of WHO (country office, regional office and headquarters) within 24 hrs “of grading the emergency.”
China first notified the WHO on January 3, 2020 of a new viral pneumonia, one week after they first became aware.
“On 5 January 2020, WHO shared detailed information and risk analyses about the cluster of cases with all Member States through the International Health Regulations Event Information Site (EIS), and published a public Disease Outbreak News alert.” [1, 2]
[Time Zones may account for this appearing to be greater than 24 hrs.]