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The World Health Orga­ni­za­tion on Mon­day grant­ed emer­gency autho­riza­tion to the Oxford-AstraZeneca coro­n­avirus vaccine.Why it mat­ters: WHO’s autho­riza­tion “should trig­ger the deliv­ery of hun­dreds of mil­lions of dos­es to coun­tries that have signed up for the U.N.-backed COVAX effort, which aims to deliv­er vac­cines to the world’s most vul­ner­a­ble,” AP writes.This is only the sec­ond vac­cine to get autho­riza­tion from the agency, fol­low­ing an emer­gency autho­riza­tion for the BioN­Tech-Pfiz­er vac­cine in December.The COVAX ini­tia­tive, with more than 180 nation par­tic­i­pants, is the glob­al effort from the World Health Orga­ni­za­tion and oth­er groups to ensure that …