MORE producers of COVID-19 vaccines should follow AstraZeneca's lead and license technology to other manufacturers, the World Health Organization's head said on Monday, as he described continuing vaccine inequity as "grotesque". AstraZeneca's shot, which new U.S. data on Monday showed was safe and effective despite some countries suspending inoculations over health concerns, is being produced in various locations including South Korea's SKBioScience and the Serum Institute of India. WHO Director-General Tedros Adhanom Ghebreyesus called for more manufacturers to adopt this model to boost supplies, including for the COVAX vaccine sharing programme seeking to speed more shots to developing countries. "The…