Sinovac was the first vaccine to be used in Thailand and was administered to medical staff. They found it to be so ineffective that the same medical staff are being given a third dose of Astra Zeneca and if anyone had only one dose of Sinovac so far, are being given Thai second dose as AZ.
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that's the one responsible for so many deaths afaik. it's the one I wouldn't take. 2%+ chance of dying is too high for me! pass. like @ura-soul said himself:
az was the primary usa shot after all
I think you're overestimating what vaccines can do for us against the virus in general