FDA to debate booster dose for single-shot vaccine

The Food and Drug Administration is wrestling with how to decide on booster doses of the single-shot Johnson & Johnson COVID-19 vaccine. 

Other manufacturers want to offer boosters six months after primary vaccination. But J&J proposed a range of times, from two months to six months. FDA scientists didn't reach a firm conclusion, citing shortcomings with J&J's data, including little information on protection against delta variant.

On Thursday and Friday, an FDA advisory panel will recommend whether to back boosters of both the J&J and Moderna vaccines.  Health authorities say all the vaccines used in the U.S. continue to provide strong protection against severe disease or death from COVID-19.