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Congratulations to Oghenebrume Wariri, MD, PhD for this new publication in Vaccine:X: "Vaccination timeliness is a key measure of immunisation system performance: A call to address priority research, policy and practice issues". Very thankful to have been part of this authorship team.

Current #immunization programs primarily track vaccination coverage (the percentage of children vaccinated), but this metric hides critical gaps like doses given too early or too late. Vaccination #timeliness -- receiving doses within the optimal, age-appropriate window -- is not as well tracked.

Timeliness is important everywhere, but may be particularly important in places with relatively high coverage, to make sure that children are protected by vaccines before they are exposed to vaccine-preventable diseases.