A 58-year-old man presents with history of recurrent rashes that became severe in the last week. The rashes were erythematous with a fine, sandpaper-like texture. He also reports having a fever and symptoms of a sore throat two weeks prior to the rash. Examination reveals a 'strawberry tongue'. Based on the history and physical examination, what mechanism is the most likely cause of this patient's symptoms?
correct answer: type 4 hypersensitivity
I picked the answer "direct toxins from bacterial exotoxins"
why is this type 4 hypersensitivity? please explain
You're right! This is a bad answer to the question. The immune-mediated reaction involved in scarlet fever, triggered by streptococcal exotoxins, is primarily considered a Type II hypersensitivity reaction. However, the rash and systemic symptoms in scarlet fever are more closely related to toxin-induced effects rather than a classic antibody-mediated attack on host tissues.
You're right! This is a bad answer to the question. The immune-mediated reaction involved in scarlet fever, triggered by streptococcal exotoxins, is primarily considered a Type II hypersensitivity reaction. However, the rash and systemic symptoms in scarlet fever are more closely related to toxin-induced effects rather than a classic antibody-mediated attack on host tissues.