Comparative evaluation of simian, simian-human, and human immunodeficiency virus infections in the pigtail macaque (Macaca nemestrina) model

AIDS Res Hum Retroviruses. 2006 Jun;22(6):580-8. doi: 10.1089/aid.2006.22.580.


The global impact of HIV/AIDS intensifies the need for a preventive vaccine and nonhuman primate models can help provide critical insights into effective immunity. Pigtail macaques (Macaca nemestrina) are increasingly studied as a nonhuman primate model for AIDS. We compared the virologic and immunologic characteristics of HIV-1, SIV, and SHIV infection of naive pigtail macaques across a series of preclinical HIV vaccine studies. SIVmac251 and SIVmac239 infection of naive pigtail macaques resulted in a gradual decline in peripheral CD4+ T cells in the setting of high levels of viremia, approximating most closely human infection of HIV-1. In contrast, the CXCR4-utilizing SHIVmn229 virus resulted in rapid depletion of CD4+ T cells and minimal generation of humoral or cellular immune responses, similar to that observed with SHIV89.6P infection of rhesus macaques. Infection with the CCR5-utilizing, rhesus macaque passaged, SHIVSF162P3 resulted in some overall CD4+ T cell decline, however, three of eight macaques naturally control SHIVSF162P3 viremia to very low levels in the setting of robust adaptive immunity. Despite attempts at infecting pigtail macaques with HIV-1 strains passaged in juvenile pigtail macaques in vivo or in PBMC isolated from pigtail macaques in vitro, only lower nonsustained levels of viral replication were observed. Our results provide a series of virologic models with which to evaluate potential AIDS vaccines in pigtail macaques.

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Animals
  • Antibodies, Viral / blood
  • CD4-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / immunology
  • Disease Models, Animal*
  • HIV Antibodies / blood
  • HIV Infections / immunology
  • HIV Infections / physiopathology*
  • HIV Infections / virology
  • HIV-1 / pathogenicity*
  • Humans
  • Macaca nemestrina
  • Neutralization Tests
  • Simian Acquired Immunodeficiency Syndrome / immunology
  • Simian Acquired Immunodeficiency Syndrome / physiopathology
  • Simian Acquired Immunodeficiency Syndrome / virology
  • Simian Immunodeficiency Virus / pathogenicity*


  • Antibodies, Viral
  • HIV Antibodies