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Journal of Clinical Microbiology, August 1998, p. 2229-2234, Vol. 36, No. 8
Experimental Neuropathology Laboratory,
Department of Pathology, University of São Paulo, São
Paulo, Brazil,1 and
Department of
Pediatrics2 and
Biostatistics Unit,
Comprehensive Cancer Center,3 University of
Alabama at Birmingham, Birmingham, Alabama
Received 12 February 1998/Returned for modification 21 March
1998/Accepted 28 April 1998
The purpose of the present study was to determine if the quantity
of herpes simplex virus (HSV) DNA in the cerebrospinal fluid (CSF) of
patients with herpes encephalitis would be useful in establishing the
prognosis of the disease and to determine the effect of antiviral
therapy on the clearance of viral DNA from the CSF. Quantitation of HSV
DNA was done by constructing an internal standard (IS) from the
glycoprotein B amplicon which had a 25-bp deletion between primer
annealing sites. Each CSF specimen was coamplified with the IS and the
ratio of the amount of HSV/amount of IS was compared to the ratios on a
standard curve constructed with the same IS plus known amounts of HSV
DNA. CSF specimens were available from 16 patients who were treated
with intravenous acyclovir, and the amount of HSV DNA ranged from <25
to 18,000 copies per µl in CSF obtained before or within 4 days of
the initiation of acyclovir therapy. Patients with >100 copies of HSV
DNA per µl were older, were found by computed tomography to have
lesions, and had poorer outcomes than patients with <100 copies.
Follow-up CSF specimens were available from seven patients. In six of
these seven patients, the HSV DNA levels decreased during therapy. One patient had a twofold increase in HSV DNA levels after 1 week of
therapy and died on day 8. The application of this assay may be helpful
in establishing the prognosis and in the monitoring of patients with
herpes simplex encephalitis.
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Application of Competitive PCR to Cerebrospinal Fluid Samples
from Patients with Herpes Simplex Encephalitis
*
Corresponding author. Mailing address: 309 BBRB, 845 19th St., South, Birmingham, AL 35294. Phone: (205) 934-6750. Fax:
(205) 934-5758. E-mail: flakeman{at}peds.uab.edu.
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