Teachers Should Get the Covid Vaccine First

Two vaccine trials reported highly encouraging results in the past week, with both versions looking to be 95% effective or better. If one or both are approved for emergency use, the U.S. might have enough doses for 20 million people in early 2021. How should the initial supply be allocated? Should it be given to populations with a higher mortality risk, or to people who are most likely to spread disease at higher rates?

Most agree that America’s 18 million health-care workers should top the list. The 3.3 million teachers...