Can Kinrix or Quadracel (DTaP-IPV) be used at kindergarten entry if the previous brand of DTaP is unknown?

Yes. Although it is preferable to use the same manufacturer’s DTaP vaccine for all of the doses in the series, you can give either Kinrix or Quadracel as the fifth dose of DTaP and fourth dose of IPV at age 4 through 6 years if the previous brand is unknown or if Kinrix or Quadracel is the only product stocked.