First of all you need to create an account by clicking here. Sign up with the email where you want to receive the notifications
Click on "+this", search "World Health Organization" and select it
Select "News from the WHO"
Write in "Filter by keyword" "Coronavirus" and then click on "Create trigger"
Click on "+that". Type and select "email" (not "Email Digest"). Click on "Send me an Email"
Click on "Create action" (without modifying anything)
Click on "FINISH"
Some external links :
WHO infos about coronavirus
No Worries