I have received my first dose of AstraZeneca vaccine a month back and it is time for second dose. However I am currently in United States where there is no AZ vaccine available. What are my options? Is it okay to take Pfizer or Moderna as the second dose? I know that Canada and EU are mixing the vaccines with good results(Merkel took second dose of Moderna after first dose of AZ).
What is the guidance in United States? Do I need a doctor's prescription for mixed vaccination? Would I be considered vaccinated after a different second dose? Any pointers/guidance would be very helpful.