On Jun. 1, 2021, Sanofi announced that Vaxelis (Diphtheria and Tetanus Toxoids and Acellular Pertussis, Inactivated Poliovirus, Haemophilus b Conjugate and Hepatitis B Vaccine), developed as part of a partnership between with Merck was available in the U.S.

Vaxelis was the first and only hexavalent (six-in-one) combination vaccine available in the U.S. Vaxelis is a vaccine given to protect your child from getting diphtheria, tetanus (lockjaw), pertussis (whooping cough), polio, Hib (Haemophilus influenzae type b), and hepatitis B.