GENEVA: The World Health Organization expects there will be no reason to change its assessment that the benefits of the AstraZeneca vaccine against COVID-19 outweigh any risks, its regulatory director said on Tuesday.The WHO is closely studying the latest data alongside European and other regulators, in light of reports of blood clots among people who have been vaccinated, said Rogerio Gaspar, WHO director of regulation and prequalification.A senior official at Europe's medicines regulator has said there is a clear "association" between AstraZeneca's COVID-19 vaccine and very rare blood clots in the brain, though the direct cause of the clots is still unknown.The European Medical Agency (EMA) said in a statement after the comments by Marco.