Live, attenuated simian immunodeficiency virus vaccines elicit potent resistance against a challenge with a Human Immunodeficiency Virus type 1 chimeric virus

Riri Shibata, Christine Siemon, Susan C. Czajak, Ronald C. Desrosiers, Malcolm A. Martin

Research output: Contribution to journalArticle

100 Scopus citations


Three rhesus macaques, previously immunized with SIVΔ3 or SIVΔ2, each an attenuated derivative of SIV(mac239), and two naive monkeys were challenged with 30,000 50% tissue culture infective doses of SHIV, an SIV/human immunodeficiency virus type 1 (HIV-1) chimeric virus bearing the dual-tropic envelope of HIV-1(DH12). By several criteria, including virus isolation, serological assays, and PCR (both DNA and reverse transcriptase), SHIV levels were reduced to barely detectable levels in the circulating blood of vaccinated animals. The resistant SIV-vaccinated macaques had no preexisting neutralizing antibodies directed against SHIV, nor did they produce neutralizing antibodies at any time over a 14-month observation period following SHIV challenge. Interestingly, SIV sequences, derived from the vaccine, could be amplified from numerous tissue samples collected at the conclusion of the experiment, 60 weeks postchallenge, but SHIV-specific sequences (viz, HIV-1 env) could not. These results demonstrate that live attenuated SIV vaccines provide strong long-term protection even against challenge strains with highly divergent envelope sequences.

Original languageEnglish (US)
Pages (from-to)8141-8148
Number of pages8
JournalJournal of virology
Issue number11
StatePublished - Nov 1 1997
Externally publishedYes


ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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