A 22-year-old woman ate some seafood. 5 hours later the trunk and the distal parts of limbs got covered with small itchy papules which were partially fused together. After one day, the rash disappeared spontaneously. Specify the hypersensitivity mechanism underlying these changes:

Answer options

1. Systemic anaphylaxis
2. Immune complex hypersensitivity
3. Atopy (local anaphylaxis)
4. Antibody-dependent cell-mediated cytolysis
5. Cellular cytotoxicity

Explanation

Firstly, this is an anaphylactic reaction because of its immediate reaction, then the symptom of itchy rashes which disappeared after one day shows that it wasn’t systemic.