Scientist Xinhua Yan works in the lab at Moderna in Cambridge, Massachusetts, on Feb. 28, 2020.
David L. Ryan | Boston Globe | Getty Images
More Covid-19 vaccines are being developed by researchers in the United States than in any other country, according to the WHO.
The WHO’s most recent update on global vaccine development projects, published Tuesday, showed there are currently at least 133 vaccines being tested around the world.
U.S. institutions are working on the highest number of these — 42 — according to the WHO’s list, and Chinese research facilities are working on 19, meaning China is