On June 24, 2008, the Food and Drug Administration licensed a combined diphtheria and tetanus toxoids and acellular pertussis adsorbed (DTaP) and inactivated poliovirus (IPV) vaccine, DTaP-IPV (Kinrix, GlaxoSmithKline Biologicals, Rixensart, Belgium). Kinrix is licensed for use as the fifth dose of the DTaP vaccine series and the fourth dose of the IPV series in children aged 4-6 years whose previous DTaP vaccine doses were DTaP (Infanrix, GlaxoSmithKline) and/or DTaP-Hepatitis B-IPV (Pediarix, GlaxoSmithKline) for the first 3 doses and DTaP (Infanrix) for the fourth dose. DTaP-IPV administered to children aged 4-6 years would reduce by one the number of injections needed to complete DTaP and IPV immunization. This report summarizes the indications for Kinrix and provides guidance from the Advisory Committee on Immunization Practices (ACIP) for its use.