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Journal of Clinical Microbiology, February 1999, p. 350-353, Vol. 37, No. 2
Departments of
Microbiology,1
Epidemiology,5
Medicine,2 and
Biostatistics,4 University of
Washington, Seattle, Washington 98195, and
Department of
Medical Microbiology, University of Nairobi, Nairobi,
Kenya3
Received 16 April 1998/Returned for modification 26 May
1998/Accepted 2 November 1998
PCR is a highly sensitive method for the detection of human
immunodeficiency virus type 1 (HIV-1) nucleic acids in blood
mononuclear cells and plasma. However, blood separation techniques
require extensive laboratory support systems and are difficult when a limited volume of blood is available, which is often the case for
infants. The use of blood samples stored on filter paper has many
advantages for the detection of perinatal HIV-1 infection, but current
methods require extraction and purification of target DNA prior to PCR
amplification. We report a highly sensitive and rapid method for the
extraction and detection of HIV-1 DNA in infant blood samples stored on
filter papers. Because this rapid protocol does not involve steps for
the removal of potential inhibitors of the PCR, the highest sensitivity
is achieved by testing the filter paper lysate in quadruplicate. Assays
for HIV-1 DNA were done by using nested PCR techniques that amplify
HIV-1 gag DNA from blood spot samples on filter paper and
from corresponding viably frozen mononuclear cells separated from
venous blood samples obtained from 111 infants born to
HIV-1-seropositive mothers. PCR results with blood from filter papers
showed 100% specificity (95% confidence internal [CI] 93.1 to
100%) and 96% (95% CI, 88.65 to 98.9%) and 88% (95% CI, 79.2 to
94.5%) sensitivity (for quadruplicate and duplicate tests,
respectively) compared to PCR results with blood mononuclear cells.
Moreover, this method could detect HIV-1 sequences of multiple subtypes.
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Rapid Method for Screening Dried Blood Samples on
Filter Paper for Human Immunodeficiency Virus Type 1 DNA
*
Corresponding author. Mailing address: Department of
Microbiology, University of Washington, Box 357242, Seattle, WA 98195. Phone: (206) 543-3146. Fax: (206) 543-8297. E-mail:
overbaug{at}u.washington.edu.
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