In early 2026, the widespread adoption of "six-in-one" hexavalent vaccines is revolutionizing routine immunization by combining protection against polio (IPV) with diphtheria, tetanus, pertussis, hepatitis B, and Hib in a single injection. These 2026 vaccine rollouts, supported by Gavi and the Sabin Vaccine Institute, are significantly reducing the number of injections a child needs, which...