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Strict lymphotropism of Epstein-Barr virus during acute infectious
mononucleosis in nonimmunocompromised individuals
MA Karajannis, M Hummel, I Anagnostopoulos and H Stein
Institute of Pathology, Klinikum Benjamin Franklin, Free University Berlin,
Germany.
Previous investigations of exfoliated oropharyngeal cells from individuals
suffering from infectious mononucleosis (IM) suggested that the
oropharyngeal epithelia are the primary target and also the site of
life-long persistence of the Epstein-Barr virus (EBV). This concept was
widely accepted. However, the investigation of histological sections with
more sensitive EBV detection techniques has drawn this concept into doubt
since EBV proved to be constantly absent in normal epithelial cells. To
elucidate the discrepancy, throat washings and peripheral mononuclear blood
cells from 16 patients suffering from IM were investigated for EBV-DNA and
EBV gene products employing highly sensitive in situ hybridization,
immunocytochemistry, and polymerase chain reaction. Although all patients
exhibited latently infected B lymphocytes in peripheral blood, samples of
exfoliated oropharyngeal cells were constantly EBV-negative with the
exception of three cases. In these cases, the patients additionally
suffered from purulent ulcerating tonsillitis, EBV-infected B cells, but no
EBV-infected epithelial cells were detectable. These findings support the
view that recirculating lymphocytes of B-cell origin, but not epithelial
cells are the initial target of EBV during primary infection and that B
cells also represent the site of life-long viral persistence.
Volume 89,
Issue 8,
pp. 2856-2862,
04/15/1997
Copyright © 1997 by The American Society of Hematology

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