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Type 3 hypersensitivity is confusing!!

scilearner
in Biology

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Hello guys,

 

I'm reading and trying to understand this and going no where. From what I gather in Type 3 hypersensitivity, there is too much antigen and small immune complexes are made, which are not phagocytosed and deposit in tissue causing tissue damage. Then what has Arthus reaction and serum sickness got to do with this concept (small immune complexes). I don't understand Arthus reaction and serum sickness, despite reading it for sometime now :)

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