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AstraZeneca's Covishield is not an mRNA vaccine; it is a viral vector vaccine, using Adenovirus. The small possibility of blood clots was acknowledged by medical authorities after a few months of use, with some jurisdictions going so far as to suspend its use, citing the mRNA vaccines as a safer alternative.
https://en.wikipedia.org/wiki/Oxford%E2%80%93AstraZeneca_COV...
I wouldn't expect this distinction to matter much