Please tell us about the combination vaccine Kinrix (DTaP-IPV) and the recommendations for its use.

In 2008, FDA licensed Kinrix, a combination DTaP and IPV vaccine. It is approved for use as the fifth dose of DTaP and the fourth dose of IPV in children ages 4 through 6 years who received DTaP (Infanrix) and/or DTaP-HepB-IPV (Pediarix) as the first three doses and DTaP (Infanrix) as the fourth dose. It should not be given to children younger than age 4 years.