"Based on the lessons learned from the 2014-16 outbreak and through rapid, coordinated response efforts... Guinea managed to control the outbreak and prevent its spread beyond its borders," WHO.
US President Joe Biden said last week he supported the waiver idea, but the European Union and other developed country opponents said it will not increase output.
"To have solved the unacceptable problem of inequity of access to vaccines, we have to be holistic. It's not one or the other," she said, adding this could not drag out for years.
"While we appreciate the work of AstraZeneca who have been steadily increasing the speed and volume of their deliveries, we need other manufacturers to follow suit," said WHO Director-General Tedros Adhanom Ghebreyesus at a virtual briefing, mentioning Pfizer and Moderna specifically.
The WHO is hoping more countries will follow France and Sweden in donating shots to COVAX after inoculating their priority populations to help address a gulf in vaccination rates.
The UN health agency said the B.1.617 variant of Covid-19, first found in India in October, had been detected in sequences uploaded to the GISAID open-access database.
Tourism might get a shot in the arm from the European Union, which said it was "fully on track" to ensure a Covid health pass would be ready in June to boost travel.
This afternoon, WHO gave emergency use listing to Sinopharm Beijing's Covid-19 vaccine, making it the sixth vaccine to receive WHO validation for safety, efficacy and quality.