What you need to know about J&J’s COVID vaccine - Atlanta Journal Constitution

The Pfizer-BioNTech and Moderna vaccines are made using messenger RNA, a technology that gives instructions for making a harmless piece of what is called the “spike protein.” The spike protein is found on the surface of the virus that causes COVID-19.

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.

Studies conducted in the U.S., South Africa and Central and South America showed it to be less effective, though, than the mRNA vaccines at preventing moderate illness, with an efficacy rate of 66% overall?

Two people suffered severe allergic reactions shortly after getting the Johnson & Johnson COVID-19 vaccine, a J&J scientist told the FDA panel Friday?

Should people consider waiting for the Pfizer-BioNTech or Moderna vaccines, which have higher efficacy?

The CDC advises that those with a severe allergic reaction to any ingredient in the Pfizer-BioNTech or Moderna vaccines not get them.

How many doses will J&J supply and when will they be available.

The company says it will have 4 million doses available to ship immediately as soon as the vaccine is authorized, although earlier it had pledged to have 10 million available by the end of February.

No COVID-19 vaccines have been authorized yet for young children

However, the Pfizer-BioNTech vaccine is available for those ages 16 and 17