Journal Article

Type 1/Type 2 Immunity in Infectious Diseases

Brad Spellberg and John E. Edwards

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 32, issue 1, pages 76-102
Published in print January 2001 | ISSN: 1058-4838
Published online January 2001 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/317537
Type 1/Type 2 Immunity in Infectious Diseases

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T helper type 1 (Th1) lymphocytes secrete secrete interleukin (IL)-2, interferon-γ, and lymphotoxin-α and stimulate type 1 immunity, which is characterized by intense phagocytic activity. Conversely, Th2 cells secrete IL-4, IL-5, IL-9, IL-10, and IL-13 and stimulate type 2 immunity, which is characterized by high antibody titers. Type 1 and type 2 immunity are not strictly synonymous with cell-mediated and humoral immunity, because Th1 cells also stimulate moderate levels of antibody production, whereas Th2 cells actively suppress phagocytosis. For most infections, save those caused by large eukaryotic pathogens, type 1 immunity is protective, whereas type 2 responses assist with the resolution of cell-mediated inflammation. Severe systemic stress, immunosuppression, or overwhelming microbial inoculation causes the immune system to mount a type 2 response to an infection normally controlled by type 1 immunity. In such cases, administration of antimicrobial chemotherapy and exogenous cytokines restores systemic balance, which allows successful immune responses to clear the infection.

Journal Article.  23151 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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