This week, health care providers began administering the first doses of Johnson & Johnson's COVID-19 vaccine in the U.S. — the third vaccine authorized by the Food and Drug Administration to help stop the coronavirus pandemic.
That's welcome news in a country that still faces high levels of circulating virus in most regions, and a demand for vaccine that still far outstrips supply.
The J&J vaccine has some significant advantages, health officials say. Unlike the Moderna and Pfizer vaccines, it can be stored for up to three months at regular refrigerator temperatures, so it's easier to distribute to more places. And you're fully vaccinated after just one dose — a welcome convenience for many recipients who dread the two-shot regimen of the Moderna and Pfizer vaccines.