The head of the World Health Organization called Wednesday for a moratorium on administering booster shots of COVID-19 vaccines as a way to help ensure that doses are available in countries where few people have received their first shots. https://www.modernhealthcare.com/safety/head-un-health-agency-seeks-vaccine-booster-moratorium?utm_medium=social&utm_source=twitter&utm_term=modrnhealthcr&utm_content=d877246e-f13b-4996-8168-0b956f09766c