The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 175, 1143-1145, Copyright © 1992 by Rockefeller University Press


ARTICLES

Transgenic mice lacking class I major histocompatibility complex- restricted T cells have delayed viral clearance and increased mortality after influenza virus challenge

BS Bender, T Croghan, L Zhang and PA Small Jr
Department of Medicine, University of Florida College of Medicine, Gainesville.

To investigate the role of CD8+ T lymphocytes in recovery from influenza pneumonia, we used transgenic mice either homozygous (-/-) or heterozygous (+/-) for beta 2-microglobulin (beta 2-M) gene disruption. These mice lack major histocompatibility complex-restricted class I (CD8+) T cells. We found that after challenge with a nonlethal influenza virus, the beta 2-M (-/-) mice had significantly delayed pulmonary viral clearance. Furthermore, after challenge with a more virulent influenza virus, the beta 2-M (-/-) mice had a significantly higher mortality rate than did control mice. Thus, CD8+ T cells are important in recovery from virulent influenza infections, but other host defense mechanisms can clear the respiratory tract of more benign infections.
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