(People who are 12 to 17 years old are only eligible for the Pfizer vaccine). Walk-ins and appointments are available at: MHHCs COVID-19 Vaccination SIte in Collaboration with DOH - 70 West Burnside; MHHCs COVID-19 Vaccination Site in Collaboration with DOH- 825 E. 233rd Street (Vanguard) By appointments ONLY: Main Site - 85 W. Burnside Avenue.