<prompt> A previously healthy eight year old boy presented to the emergency depament with high grade fever, ahralgia, pruiritic erythematous rash and lymphadenopathy. He has completed 8 days out of a 10 day course of cefaclor for an upper respiratory tract infection. Which of the following is the most likely diagnosis?Kawasaki DiseaseType III Hypersensitivity ReactionSerum sickness Like Illness SSLIHenoch schonlein purpura  <response>: Boy in the questions who developed the fever,rash,lymphadenopathy, after taking cefaclor for UI is suffering from drug induced serum sickness. Ref: Essentials of emergency medicine By Richard Aghababian page307; What to do About Allergies By Harvard Health Publications page 8. 