I feed frozen ones to my dwarf puffers and as treats for my other fish. I haven't had problems, but I almost never touch them.
I defrost them a small cup with tank water. I then use a pink chopstick (I used to see how long it would tank for them to link the pink chopstick with food. I'm home schooled and the fish count as science
) to pick them up and put them in the tank. Plus that way i can aim them at/give them to certain fish and make sure they get their share.
I'm rather surprised that I'm not allergic as i have many allergies, both food and environmental but glad I'm not!