I’m aware that vaccine centres are giving out whatever they have available but how will that work for 2nd doses?
Surely if your first dose was Pfizer, that should be the one you have for the 2nd dose too as Pfizer and Astra Zeneca work in different ways? How will that work logistically though?
Is there any trials of how giving a different vaccine as a 2nd dose works and any side effects/interactions?