
What you need to know about J&J’s COVID vaccine – Atlanta Journal Constitution
What are the advantages of this new vaccine?
The vaccine requires only a single dose, rather than the two doses required for the mRNA vaccines, and it can become protective as early as 14 days after administration. The vaccine also can be stored in refrigerators for at least three months, the company says, while the new mRNA vaccines require much colder storage. Those advantages make it easier to distribute the vaccine in rural areas and administer it to masses of people during the pandemic.
How effective is it?
A review by the Food and Drug Administration found that the vaccine is highly effective at preventing hospitalizations and deaths 28 days after immunization.
Studies conducted in the U.S., South Africa and Central and South America showed it to be less effective, though, than the...