Well, yeah. If the person that ate the shrimp cocktail had some form of the protein that causes the reaction present on their person, and the allergic party were to come into contact with it, why yes, it is possible.
you chose a poor example, please show your medical license and years experience for you to have made that assumption https://www.mayoclinicproceedings.org/article/S0025-6196%2811%2962554-8/fulltext
Now do a back flip and do your part to clean up the gene pool
Jesus, you are too fucking retarded to live…End yourself post haste. You asked for one example you got it. You are too dumb to fucking suck air. Holy shit