The vaccinations ended around 4 p.m. The Missouri National Guard reported an approximate total of 1,800 vaccines used. UPDATE: In a statement, the Audrain County Health Department confirmed that approximately 1,600 doses of Pfizer COVID-19 vaccine were administered at a mass vaccination event at Mexico Memorial Airport Friday. The event had 2,500 doses to give. The leftover doses from the event will be used for Audrain County residents who are on the health department's waiting list. To get on that list, if you are in Phase 1A or Phase 1B- Tier 1 & 2, click here. ACHD said approximately five people were turned away for not meeting the requirements of the event.