I think I've come down with the flu.

我就娶妻生子﹐住下来了。

youdao

Not so well. I've come down with the flu.

不是很好。我得流感，病倒了。

youdao

For the executive who doesn’t have time to come down with the flu, a Japanese company has invented a new form of protection – the anti-H1N1 suit.

针对不能将时间耽误在流感上的管理人员，一家日本公司发明了一种新的保护方法——抗甲型H1N1 流感病毒西服。

youdao

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

It is theoretically possible to still come down with the flu during this window period while your body is producing antibodies to the vaccine.

FORBES: 2013 Flu Season: How to Protect Yourself