An FDA advisory panel will meet Thursday and Friday to discuss boosters for the Moderna and Johnson & Johnson vaccines.

They will also look at whether boosters are recommended for everyone 18 and older.

On Oct. 26, that same advisory committee will convene to discuss Pfizer's request for emergency use authorization for its vaccine in children ages 5-11.

The White House told state governors to start preparing to vaccinate children as young as 5 by early November.

Also up for debate -- whether you can mix and match vaccines. Preliminary results of a new study found that getting the Johnson and Johnson may be beneficial. 

Scientists too said they saw a stronger immune response with a booster of Pfizer or Moderna than a second dose of Johnson and Johnson,