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J. Virol., 11 1997, 8735-8742, Vol 71, No. 11
Copyright © 1997, American Society for Microbiology

Evidence that resolution of rotavirus infection in mice is due to both CD4 and CD8 cell-dependent activities

MM McNeal, MN Rae and RL Ward
Division of Infectious Diseases, Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA.

The effector functions responsible for resolution of shedding in mice orally inoculated with the murine rotavirus strain EDIM were identified in B-cell-deficient and normal BALB/c mice after monoclonal antibody (MAb) depletion of CD4 and CD8 cells. When depleted of CD8 cells, B- cell-deficient muMt mice resolved their infections more slowly than nondepleted animals, but CD4 cell depletion caused chronic, high-level shedding. This finding indicated that CD4 cell-dependent immunological effectors other than, or in addition to, CD8 cells played roles in rotavirus resolution in muMt mice in the absence of antibody. The roles of CD4 and CD8 cells in resolution of rotavirus shedding were further characterized in immunologically normal BALB/c mice. Depletion of CD4 cells before EDIM inoculation resulted in rapid resolution of most shedding, but chronic, low-level shedding continued for weeks. When the CD4 cell-depleted BALB/c mice were subsequently depleted of CD8 cells, shedding levels increased significantly (P < 0.001), indicating that CD8 cells were responsible for the rapid but incomplete suppression of rotavirus shedding. Further experimentation revealed that little rotavirus antibody was made in CD4 cell-depleted BALB/c mice, and only after CD4 cells were repopulated did antibody production increase and virus shedding fully resolve. Thus, resolution of rotavirus shedding in both muMt and BALB/c mice was associated with CD4 and CD8 cell effector activities.


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