Covid vaccination

[ai7559]

Hi. I would like to get advice on couple of questions regarding covid vaccination.
1/ Anyone here know the duration of each vaccine brands' 1st to 2nd dos duration?
I am asking this because I plan to go home hoping by early next year (hoping situation would be more stabilize by then). I heard some Thais who got Astra 1st dos and 2nd is scheduled 3 mths later. Some Astra got 2nd dos as 1 mth later. While some Sinovac 2nd dos is few weeks apart. So, I wonder if the Gov is having a proper/solid/more organised plan for the vaccination. I would like to make sure that I manage to catch up with the vaccination properly before leaving Thailand.

2/ Do they allow us to choose the vaccine brand? Or is there any way one could get a choice (eg health condition etc). (Provided that they available)

3/ As for now, is vaccination the only way to enter a country? Does any country allows anyone without vaccination to enter? (After all, compulsary quarantine is still on. What's the different of one with/without vaccination?)

 

4/ Please advise procedure to get a vaccinated document for travelling purposes. (Understand that we need to request for a English version document which is only given by request).

Thank you in advance.