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- W1997841295 abstract "Normal nasopharyngeal tissues from 23 individuals who died of causes unrelated to the upper respiratory system and had no evidence of Epstein-Barr virus (EBV)-related diseases were studied using in situ hybridisation (ISH) and immunohistochemistry for the detection of EBV RNA and expression of EBV proteins, respectively. ISH using 35S-labelled riboprobe for EBV EBER RNA showed occasional to a few EBER + lymphocytes in the stroma of nasopharyngeal mucosa in 14/16 cases with available paraffin-embedded tissues. In addition, very rare intraep-ithelial EBER+ lymphocytes were also detected in 3/16 cases. However, in none of these cases was EBER detected in the epithelial cells. Similar results were obtained using a nonradioactive ISH method for EBER (Dako). In 3/23 cases, im-munostaining using monoclonal antibodies for EBV proteins on cryostat sections showed occasional cells in the stroma expressing EBV nuclear antigen 2 (EBNA2), latent membrane protein-1 (LMP), and switch protein encoded by BZLF1 gene (ZEBRA) in two cases and only very rare LMP+ and ZEBRA+ cells in one other case. Double immuno-staining combining alkaline phosphatase anti-alkaline phosphatase (APAAP) for CD markers and indirect immunofluorescence for LMP showed that the LMP+ cells were either CD19+ or less frequently CD3+, but none were CD68+. These results show that both B and T lymphocytes harbouring EBV can be found in the normal nasopharyngeal tissues. Interestingly, EBV proteins associated with lytic viral replication—diffuse early antigen (EA-D), viral capsid antigen (VCA), or membrane antigen (MA)—were also detected in rare cells in the stroma in one case, and in another case only one MA+ cell was detected. These results provide evidence for a lytic type of infection by EBV in the normal nasopharynx involving a very small proportion of stromal lymphocytes and support the view that nasopharyngeal lymphocytes can act as a reservoir for EBV in normal individuals. © 1995 Wiley-Liss, Inc." @default.
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- W1997841295 date "1995-01-01" @default.
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- W1997841295 title "Evidence for lytic infection by Epstein-Barr virus in mucosal lymphocytes instead of nasopharyngeal epithelial cells in normal individuals." @default.
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- W1997841295 doi "https://doi.org/10.1002/jmv.1890450114" @default.
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