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Journal of Virology, April 2000, p. 3537-3542, Vol. 74, No. 8
Institut für Virologie,
Universität Erlangen-Nürnberg,
Erlangen,1 Institut für Virologie
und Immunobiologie, Universität Würzburg,
Würzburg,3 Deutsches
Primatenzentrum, Göttingen,5 and
Institut für Virologie, Universität Leipzig,
Leipzig,6 Germany; Henry M. Jackson
Foundation, Rockville, Maryland2; and
Department of Cancer Immunology and AIDS, Dana-Farber
Cancer Institute, Boston, Massachusetts4
Received 25 October 1999/Accepted 14 January 2000
Live, attenuated immunodeficiency virus vaccines, such as
nef deletion mutants, are the most effective vaccines
tested in the simian immunodeficiency virus (SIV) macaque model. In two independent studies designed to determine the breadth of protection induced by live, attenuated SIV vaccines, we noticed that three of the
vaccinated macaques developed higher set point viral load levels than
unvaccinated control monkeys. Two of these vaccinated monkeys developed
AIDS, while the control monkeys infected in parallel remained
asymptomatic. Concomitant with an increase in viral load, a recombinant
of the vaccine virus and the challenge virus could be detected.
Therefore, the emergence of more-virulent recombinants of live,
attenuated immunodeficiency viruses and less-aggressive wild-type
viruses seems to be an additional risk of live, attenuated
immunodeficiency virus vaccines.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Evidence for Recombination of Live, Attenuated Immunodeficiency
Virus Vaccine with Challenge Virus to a More Virulent Strain
*
Corresponding author. Mailing address: Institut
für Virologie, University of Leipzig, Liebigstr. 24, D-04103 Leipzig, Germany. Phone: 49-341-9714314. Fax:
49-341-9714309. E-mail:
ueberla{at}medizin.uni-leipzig.de.
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