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"Many health workers have fled their work areas due to bombardments and are not reporting for duty," said WHO Director-General Tedros Adhanom Ghebreyesus during a briefing in Geneva on Thursday. "This is greatly hindering the delivery of mass trauma care and the continuity of health services."

African experts have estimated the continent might need about 10 million vaccines to stop the ongoing outbreaks

"The shocking global disparity in access to vaccines remains one of the biggest risks to ending the pandemic," WHO Director-General Tedros said.

The clinical trial, named Solidarity, was first announced on March 18 by WHO director-general Tedros Adhanom Ghebreyesus.