In this Monday, March 1, 2021 file photo, a health worker prepares to administer COVISHIELD vaccine to an elderly man at a government hospital in Noida, a suburb of New Delhi, India. When the World Health Organization declared the coronavirus a pandemic one year ago Thursday, March 11 it did so only after weeks of resisting the term and maintaining the highly infectious virus could still be stopped. A year later, the U.N. agency is still struggling to keep on top of the evolving science of COVID-19, to persuade countries to abandon their nationalistic tendencies and help get vaccines where they’re needed most.(AP Photo/Altaf Qadri, file)