The St. Louis Rams canceled practice Thursday due to an undisclosed number of swine flu cases on the team. Steve Spagnuolo would not say how many players had the illness but said five or six players had flulike symptoms, and added that other players had reported symptoms the last few weeks. He anticipated the Rams would return to practice on Friday with a workout that will incorporate some of the elements missed on Thursday. "It's really more of a precaution than anything," Spagnuolo said. "We're checking everybody, we're just being careful."