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Journal of Virology, May 1999, p. 3753-3757, Vol. 73, No. 5
Laboratory of Persistent Viral Diseases,
Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana 59840
Received 13 November 1998/Accepted 5 February 1999
Many human viruses not only cause acute diseases but also establish
persistent infections. Such persistent viruses can cause chronic
diseases or can reactivate to cause acute diseases in AIDS patients or
patients receiving immunosuppressive therapies. While the
prevention of persistent infections is an important consideration
in the design of modern vaccines, surprisingly little is known about
this aspect of protection. In the current study, we tested the
feasibility of vaccine prevention of retroviral persistence by using a
Friend virus model that we recently developed. In this model,
persistent virus can be detected at very low levels by
immunosuppressing the host to reactivate virus or by transferring persistently infected spleen cells into highly susceptible mice. Two
vaccines were analyzed, a recombinant vaccinia virus vector expressing Friend virus envelope protein and a live
attenuated Friend virus. Both vaccines reduced pathogenic virus loads
to levels undetectable by infectious center assays. However,
only the live, attenuated vaccine prevented immunosuppression-induced reactivation of persistent virus. Thus, even very low levels of persistent Friend virus posed a significant threat during
immunosuppression. Our results demonstrate that vaccine protection
against establishment of retroviral persistence is attainable.
0022-538X/99/$04.00+0
Protection against Establishment of Retroviral
Persistence by Vaccination with a Live Attenuated Virus
*
Corresponding author. Mailing address: Laboratory of
Persistent Viral Diseases, Rocky Mountain Laboratories, NIAID, NIH, 903 S. 4th St., Hamilton, MT 59840. Phone: (406) 363-9310. Fax: (406) 363-9286. E-mail: khasenkrug{at}nih.gov.
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