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Journal of Virology, December 2004, p. 12951-12963, Vol. 78, No. 23
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.23.12951-12963.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Two Modes of Pseudorabies Virus Neuroinvasion and Lethality in Mice

Elizabeth E. Brittle, Ashley E. Reynolds, and L. W. Enquist*

Department of Molecular Biology, Princeton University, Princeton, New Jersey

Received 17 June 2004/ Accepted 6 August 2004

We describe two distinct modes of neuroinvasion and lethality after murine flank inoculation with virulent and attenuated strains of pseudorabies virus (PRV). Mice infected with virulent (e.g., PRV-Becker, PRV-Kaplan, or PRV-NIA3) strains self-mutilate their flank skin in response to virally induced pruritus, die rapidly with no identifiable symptoms of central nervous system (CNS) infection such as behavioral abnormalities, and have little infectious virus or viral antigen in the brain. In distinct contrast, animals infected with an attenuated PRV vaccine strain (PRV-Bartha) survive approximately three times longer than wild-type PRV-infected animals, exhibit severe CNS abnormalities, and have an abundance of infectious virus in the brain at the time of death. Interestingly, these animals have no skin lesions and do not appear pruritic at any time during infection. The severe pruritus and relatively earlier time until death induced by wild-type PRV infection may reflect the peripheral nervous system (PNS) and immune responses to infection rather than a fatal, virally induced CNS pathology. Based on previously characterized afferent (sensory) and efferent (motor) neuronal pathways that innervate the skin, we deduced that wild-type virulent strains transit through the PNS via both afferent and efferent routes, whereas PRV-Bartha travels by only efferent routes in the PNS en route to the brain.

* Corresponding author. Mailing address: 314 Schultz Laboratory, Department of Molecular Biology, Princeton University, Princeton, NJ 08544. Phone: (609) 258-2415. Fax: (609) 258-1035. E-mail: lenquist{at}molbio.princeton.edu.

Journal of Virology, December 2004, p. 12951-12963, Vol. 78, No. 23
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.23.12951-12963.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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