Staff Contact: Mat Reidhead or Jackie Gatz
On Feb. 20, Missouri marked the watershed milestone of 1 million COVID-19 vaccine doses administered in the state since the mass vaccination campaign began nine weeks earlier on Dec. 14, 2020. The process has been wrought with unanticipated logistical challenges; however, the state has significantly improved on the velocity of doses administered to eligible individuals, despite challenges posed by extreme weather in mid-February. One such challenge is in vaccinators reserving booster doses for individuals who received prime doses at their clinic location. Anecdotal evidence suggests individuals eager to become fully inoculated against COVID-19 will register for vaccines at multiple locations and fail to notify their prime dose vaccinator when they receive their booster dose at another provider. Evaluating the state’s ShowMeVax COVID-19 vaccine administrative data quantifies the magnitude of this challenge.
By Feb. 22, more than 703,000 individuals had received at least one vaccine dose managed by the state. Nearly half of those individuals (46.5%) had received both prime and booster doses for full protection against the disease. Among the 326,784 individuals completing both doses, 11.1% received their booster shot at a clinic location different from where they received their prime dose. This infers at maximum, vaccinators may be reserving 36,273 booster doses for patients who received a prime dose at their clinic, but completed the process elsewhere — this is 3.5% of the total number of doses administered in the state thus far. However, the ShowMeVax system is built around individual system- or corporate-level providers, typically with multiple clinic locations operating under the larger provider-level licensure. For example, Walgreens Pharmacy is a licensed provider operating more than 100 individual clinic locations in Missouri. Only 1.9% of fully inoculated individuals received their booster dose at a provider other than where they received the prime dose. Assuming clinics under the same provider umbrella have the ability to share vaccination data through electronic medical records, this would infer that 6,209 doses may be unnecessarily reserved for individuals receiving booster doses via different channels. In other words, the scale of this perceived challenge likely accounts for between 0.6% and 3.5% of the total doses administered in the state to date.