immune system
• mice show increased susceptibility to infection with the Urbani strain of the severe acute respiratory syndrome coronavirus (SARS-CoV)
• mice infected with a higher dose of SARS-CoV show progressive weight loss and clinical manifestations between day 3 and 4, with much higher viral titer in the lungs and low titers in the brain, however show signs of recovery between day 8 and 9 and completely recover in the ensuing month
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