A Medscape Medical News article reports research presented at IDWeek 2026 finding that maternal measles antibodies fall below the limit of detection in most infants by 6 months, leaving fewer than 1 in 5 seropositive and making babies susceptible sooner than thought. C. Buddy Creech says earlier vaccination, around 9 months, might be warranted amid the US's highest measles incidence since 1991, while pediatrician Nathan Boonstra says the findings should give pediatricians confidence that earlier immunization is likely protective when exposure risk exists.