Editor's Note: This column was co-authored by Pierre Kory.AstraZeneca’s vaccine was widely expected to be a boon for developing countries. But its arrival has been a disappointment and only underscores the fact that ivermectin – a safe medicine that is effective against COVID-19 – should be part of an all-of-the-above strategy to end the pandemic. One million doses of the vaccine arrived in South Africa in early February with pomp and ceremony. The delivery flight was closely watched from India to Johannesburg, where it was met by President Cyril Ramaphosa at the OR Tambo International Airport. Within days, however, a...