Now that more vaccine options are now available, the
CDC is warning people to NOT mix and match
vaccines.
Health experts say Johnson
& Johnson's shot should not replace a second dose from Moderna or Pfizer.
The vaccines are not
interchangeable, and the effectiveness of mixing
them has not been studied, according to the CDC.
The CDC says if there are
delays with the Pfizer or Moderna shot, the second dose can be given up to six
weeks later.