<unk>  is a reaction to an antiserum derived from an animal source. It is a type of hypersensitivity, specifically immune complex (type 3) hypersensitivity.<unk>  typically develops up to ten days after exposure to the antiserum, and symptoms are similar to an allergic reaction. However, it is different from anaphylaxis, since the symptoms are not instantaneous (onset is typically 2-4 weeks after exposure).
Serum sickness
Adult-onset Still's disease
Relapsing fever
COVID-19 Nephrologic Complications
Periodic fever syndrome
Arthritis-dermatitis syndrome
DRESS syndrome
Rabies