Naturally SIV-infected sooty mangabeys: are we closer to understanding why they do not develop AIDS?

J Med Primatol. 2005 Oct;34(5-6):243-52. doi: 10.1111/j.1600-0684.2005.00122.x.


Simian immunodeficiency viruses (SIV) infection of sooty mangabey (SM) monkeys (Cercocebus atys), a natural host species, does not induce CD4+ T cell depletion and acquired immunodeficiency syndrome (AIDS) despite chronic high levels of virus replication. In contrast, SIV infection of non-natural host species, such as rhesus macaques (RM), induces a disease that closely resembles AIDS in humans. The mechanisms underlying the lack of disease progression in SIV-infected SMs are incompletely understood, but certainly reflect a complex evolutionary adaptation whereby the host immune system is not significantly damaged by the highly replicating virus. It is now widely recognized that a better understanding of these mechanisms may provide clues to the pathogenesis of immunodeficiency in HIV-infected humans. In this article I discuss five different hypotheses that may account for the non-pathogenic course of infection in SIV-infected SMs and briefly review the available data supporting each of these hypotheses.

Publication types

  • Comparative Study
  • Review

MeSH terms

  • Animals
  • CD4-Positive T-Lymphocytes / immunology
  • CD4-Positive T-Lymphocytes / virology
  • Cell Survival / physiology
  • Cercocebus atys*
  • Disease Progression
  • Monkey Diseases / immunology
  • Monkey Diseases / physiopathology*
  • Monkey Diseases / virology*
  • Simian Acquired Immunodeficiency Syndrome / immunology
  • Simian Acquired Immunodeficiency Syndrome / physiopathology*
  • Simian Immunodeficiency Virus / pathogenicity*
  • Species Specificity