COVID-19 vaccine doses to allow those who got a first shot of AstraZeneca to get another brand if desired.The provincial government, along with Ontario’s chief medical officer of health, gave the green light on Thursday in alignment with updated guidance from NACI (National Advisory Committee on Immunization).The change is effective June 4.Ontario residents who received one shot of AstraZeneca can choose to take a second dose of AstraZeneca or an mRNA vaccine dose such as Pfizer or Moderna.
NACI recommends mixing AstraZeneca, Pfizer, Moderna COVID-19 vaccines Starting June 4, those who received their first AstraZeneca shot 12 weeks ago and who would like a second of the same dose can contact the pharmacy or primary care provider where.