Noted: ?We?re sort of working under the assumption ? at least, on our campus ? that we?re going to see cases similar to what we saw three years ago,? said Craig M. Roberts, an epidemiologist at the University of Wisconsin at Madison health services. During the swine flu pandemic, 15 to 20 percent of clinic visits at Wisconsin were for flu-like illness. The usual threshold for outbreak is just 2 to 3 percent of total visits.