You were out in the garage going through boxes when you were bitten by an a spider.You tell the doctor that the spider was tiny and black,causing the doctor to think perhaps that it was a black widow spider The doctor gives you an injection of antibody to the spider venom to give you immediate protection.The antibody is produced in horses by injecting them with small doses of the spider venom,causing the horse's immune system to make large amounts of specific antibody to the antigen.The horse serum is then purified before being given to humans.
A week later,you notice a red rash spreading away from the injection spot,where the doctor gave you the anti-venom shot.A few days later,the rash has spread and swelling in also present.You have joint pain as well as sore muscles all over your body.The lymph nodes in the armpit are swollen and painful.Going back to the doctor,he diagnoses you with:

Question

Quizplus · Accepted Answer

The symptoms described - rash, swelling, joint pain, sore muscles, and lymph node inflammation - are consistent with serum sickness. This is a type III hypersensitivity reaction that can occur in response to foreign proteins, such as those found in the horse serum used to make the spider venom antibody. Symptoms typically appear 1-2 weeks after the injection and can last for up to several weeks.

You Were Out in the Garage Going Through Boxes When