Couple of years back in 2019 I was diagnosed with Peritonsillar Abscess. I had to undergo a CT scan of the throat. It was my first CT scan till date. However I had an allergic reaction to the contrast dye used. Whole body was covered with rashes and everything turned red. I was immediately injected with some antidote, probably an anti allergic. This turned normal soon. I was asked to mention this in future whenever any need of CT scan arises. Now, my COVISHEID vaccine is scheduled for 29th May. I don't have any history of allergic reaction apart from the incident mentioned above. Should it be a cause for concern ? As doctors have been asking to keep in mind any sort of allergies that one might have before taking the vaccine. Is there any risk involved?