Appearance of eleven-month-old Specific Pathogen Free (SPF) mice that are uninfected and chronically infected with T. gondii. (A) Eleven month old uninfected Swiss Webster mouse. (B) Eleven month old infected female mouse from the same SPF colony ten months after acquisition of T. gondii infection. Note hunched body position, poor grooming, piloerection, reduced body mass, and tail wounding. (C) Chronically infected SPF mouse with abnormal body position.