It could have been the corona vaccine, but it could have just as easily been any of the other components. It could even have been a reaction to the preservative or base in the vaccine (rare, but does happen) An allergic reaction can occur after a 1st exposure or 101st, so without them giving each component separately, there is no way of knowing for sure. That's why they are recommending no rabies vaccine, too.
Kudos to your vet for recognizing the problem and correcting it right away. And especially for providing you with the info that this pup should not have any more vaccines.
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