On Dec. 26, 2018, Sanofi announced the U.S. Food and Drug Administration (FDA) had approved VAXELIS (Diphtheria and Tetanus Toxoids and Acellular Pertussis Adsorbed, Inactivated Poliovirus, Haemophilus b Conjugate [Meningococcal Protein Conjugate] and Hepatitis B [Recombinant] Vaccine) for use in children from 6 weeks through 4 years of age (prior to the 5th birthday). VAXELIS was developed as part of a joint-partnership between Sanofi and Merck.