The course of Semliki Forest virus (SFV) A7(74) infection in immunocompetent BALB/c, athymic nu/nu and severe combined immunodeficient (SCID) mice was compared. BALB/c mice remained healthy and exhibited transient viraemia and infectious virus in the brain from days 2 to 7. Antibodies were detectable by day 5. In comparison, SCID mice displayed a high incidence of paralysis and died: the average day of death was day 23.
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