What should your #seconddose of #covidvaccine be if 1st was AZ? Factors include wait-time/availability, Delta variant prevalence, occupational risks, and study evidence. Answer seems to leaning to Pfizer or Moderna as 2nd dose of choice.

Medical Mythbusting Commentary for June 14, 2021

Ontario shortens wait between AstraZeneca doses from 12 to 8 weeks
Mix-and-match COVID vaccines trigger potent immune response