There are currently more than 150 different COVID-19 vaccines under development. Of these, more than 50 have reached human trials, and seven have been approved for emergency or full use in parts of Europe, North America, and Asia. In the United States, two vaccines—one from the biotechnology company, Moderna and the other from drug giant Pfizer—have been granted an Emergency Use Authorization (EUA) from the FDA. To read the full story.