Time dependence of protective post-exposure prophylaxis with human monoclonal antibodies against pathogenic SHIV challenge in newborn macaques

Virology. 2007 Feb 5;358(1):69-78. doi: 10.1016/j.virol.2006.07.056. Epub 2006 Sep 25.

Abstract

In a primate model of postnatal virus transmission, we have previously shown that 1 h post-exposure prophylaxis (PEP) with a triple combination of neutralizing monoclonal antibodies (nmAbs) conferred sterilizing protection to neonatal macaques against oral challenge with pathogenic simian-human immunodeficiency virus (SHIV). Here, we show that nmAbs can also partially protect SHIV-exposed newborn macaques against infection or disease, when given as 12 or 24 h PEP, respectively. This work delineates the potential and the limits of passive immunoprophylaxis with nmAbs. Even though 24 h PEP with nmAbs did not provide sterilizing immunity to neonatal monkeys, it contained viremia and protected infants from acute disease. Taken together with our results from other PEP studies, these data show that the success of passive immunization depends on the nmAb potency/dose and the time window between virus exposure and start of immunotherapy.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Newborn
  • Antibodies, Monoclonal / immunology*
  • Antibodies, Viral / blood
  • Antibodies, Viral / immunology*
  • CD4 Lymphocyte Count
  • Disease Models, Animal
  • HIV Antibodies / immunology*
  • HIV Infections / prevention & control*
  • Immunity, Cellular
  • Immunization, Passive*
  • Macaca mulatta
  • Simian Acquired Immunodeficiency Syndrome / prevention & control*
  • Simian Immunodeficiency Virus / immunology*
  • Survival Analysis
  • Time Factors
  • Viral Load
  • Viremia

Substances

  • Antibodies, Monoclonal
  • Antibodies, Viral
  • HIV Antibodies