Delayed reactions to insect bites may include which combination of symptoms?

Delayed reactions to insect bites may include which combination of symptoms?

• A. Fever and malaise
• B. Urticaria only
• C. Fever, malaise, headache, urticaria, lymphadenopathy, polyarthritis
• D. Nausea only

Answer: (C)

Delayed reactions to insect bites are systemic immune responses that occur after a lag, often resembling a serum sickness–like reaction. The best answer includes a mix of systemic and dermatologic and musculoskeletal signs that together point to a delayed hypersensitivity process, rather than a simple local bite. Fever and malaise reflect the systemic inflammatory response, headache adds to the systemic symptomatology, urticaria shows a widespread skin reaction, lymphadenopathy indicates immune activation in the lymphoid system, and polyarthritis demonstrates joint involvement. When these features appear days after an insect bite, they signal a delayed immune-mediated reaction rather than just a local bite. The other options are limited to single or few symptoms and don’t capture the multi-system pattern seen in a delayed reaction.

Delayed reactions to insect bites are systemic immune responses that occur after a lag, often resembling a serum sickness–like reaction. The best answer includes a mix of systemic and dermatologic and musculoskeletal signs that together point to a delayed hypersensitivity process, rather than a simple local bite. Fever and malaise reflect the systemic inflammatory response, headache adds to the systemic symptomatology, urticaria shows a widespread skin reaction, lymphadenopathy indicates immune activation in the lymphoid system, and polyarthritis demonstrates joint involvement. When these features appear days after an insect bite, they signal a delayed immune-mediated reaction rather than just a local bite. The other options are limited to single or few symptoms and don’t capture the multi-system pattern seen in a delayed reaction.