He has the flu.

他患了流感。

youdao

Jack: he has the flu.

杰克：他患了流感。

youdao

He has been confined to bed with flu for the past couple of days.

他因患流感，已经几天未下床了。

《牛津词典》

He says he has worn it for two days and figures it must be working because he has not come down with the flu.

VOA: standard.2009.04.30

For the moment, he said, there is not enough information about the swine flu that has sickened hundreds in Mexico and about 50 people in the United States to accurately forecast how the disease will travel.

CNN: The story

Two of the issues to which he has devoted the most attention since he arrived in the U.S. Senate, avian flu and nuclear nonproliferation, are grand global problems, which, while relatively uncontroversial, are nonetheless risky choices for signature issues, since, in both cases, success is invisible, and failure could mean disaster of world-changing proportions.

NEWYORKER: The Conciliator

Public health officials are simply assuming that anyone with flu symptoms has swine flu, because it's the only form of the virus in circulation, he said.

CNN: Swine flu goes to college