I think this is a likely concern in some countries. The vaccines are challenging to transport and properly keep stable and manufacturing of them happens in many places and was put in place and scaled up very quickly, quality control could be an issue, same as proper transportation and storage.
Reason 5 - Quality of vaccine, freshness, poor QA, defective dose
I think this is a likely concern in some countries. The vaccines are challenging to transport and properly keep stable and manufacturing of them happens in many places and was put in place and scaled up very quickly, quality control could be an issue, same as proper transportation and storage.
I would honestly give this one a 5% chance.