What happened to Thomas?

F: Thomas is absent from his class today. Do you know what happens to him?
M: I heard he has caught a severe cold. He must be in bed by now.
F: Has he been to the hospital? He’s got to be careful, for there is a flu these days in the city.
M: Sure, I am calling to tell him to be careful.
F: We’d better buy some fruit and pay him a visit.