The transient appearance of a new substance in the serum of a drug-sensitized patient.
D000632:Aminopyrine / Q000633:toxicity*; D006801:Humans; D006967:Hypersensitivity / Q000175:diagnosis*; D007154:Immune System Diseases; D007244:Infectious Mononucleosis / Q000097:blood*; D007960:Leukocyte Disorders; D007970:Leukopenia / Q000209:etiology*
D000632:Aminopyrine
ALLERGY/diagnosis; AMINOPYRINE/toxicology; INFECTIOUS MONONUCLEOSIS/blood; LEUKOPENIA/etiology