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Enhanced safety and efficacy of live attenuated SIV vaccines by prevaccination with recombinant vaccines
Author(s) -
Jones Leslie,
Ahmad Shabbir,
Chan Kenneth,
Verardi Paulo,
Morton William R.,
Grant Richard,
Yilma Tilahun
Publication year - 2000
Publication title -
journal of medical primatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.31
H-Index - 42
eISSN - 1600-0684
pISSN - 0047-2565
DOI - 10.1034/j.1600-0684.2000.290316.x
Subject(s) - simian immunodeficiency virus , virology , attenuated vaccine , virulence , virus , biology , macaque , rhesus macaque , immunology , vaccination , disease , medicine , paleontology , biochemistry , gene
The only vaccines shown to be protective against intravenous challenge with virulent virus in the simian immunodeficiency virus (SIV)/macaque model are attenuated live SIVs. However, these vaccines have several disadvantages: 1) they persist indefinitely in vaccinated macaques; 2) they are pathogenic to neonatal macaques; and 3) they are lethal in some adult macaques. To enhance the safety and efficacy of these vaccines, we immunized macaques first with recombinant vaccines and then inoculated the animals with SIV Δnef . In the first experiment, preimmunized macaques advanced to disease slower than controls after challenge with virulent SIV; five animals survived for 3 years without disease and only the vaccine virus (SIV Δnef ) could be isolated at this time. In the second experiment, preimmunized animals had lower virus loads and no disease compared to controls.