This Sept. 2020 photo provided by Johnson & Johnson shows the investigational Janssen COVID-19 vaccine.
Johnson & Johnson's long-awaited COVID-19 vaccine appears to protect against symptomatic illness with just one shot not as strong as some two-shot rivals but still potentially helpful for a world in dire need of more doses.
Johnson & Johnson said Friday, Jan. 29, 2021 that in the U.S. and seven other countries, the first single-shot vaccine appears 66% effective overall at preventing moderate to severe COVID-19.
(Cheryl Gerber/Johnson & Johnson via AP)Johnson & Johnson asked U.S. regulators Thursday to clear the worldโs first single-dose COVID-19 vaccine, an easier-to-use option that could boost scarce supplies.
J&Jโs vaccine was safe and offered strong protection against moderate to severe COVID-19, according to preliminary results from a massive international study.