Which Hymenoptera reaction presents as a systemic anaphylactic reaction?

• A. Local reaction
• B. Delayed reaction
• C. Toxic reaction
• D. Systemic/anaphylactic reaction

Answer: (D)

Systemic anaphylaxis after Hymenoptera stings is an IgE-mediated systemic hypersensitivity that causes rapid, multisystem involvement. It typically presents with sudden symptoms such as airway swelling or bronchospasm, hives or angioedema, and hypotension or collapse. This is different from a local reaction, which stays limited to the sting site with pain and swelling; a delayed reaction, which occurs later after the sting; and a toxic reaction, which results from a large venom dose causing symptoms through venom toxicity rather than an IgE-mediated immune response. Therefore, the presentation described as systemic/anaphylactic reaction best fits the systemic anaphylaxis pattern. Immediate treatment with epinephrine is essential.