Tell your Chinese friend that under no circumstances should one go out to restaurants to eat in Shanghai, as there is a hepatitis outbreak (流行性liúxíngxìng 肝炎gānyán).
Try to use 千万 .
千万别去上海饭馆吃饭。那儿有流行性肝炎。
[Comments]
Click on the Chinese to hear the sentences spoken.
Alternatively one can say 你可别去上海饭馆吃饭。那儿有流行性肝炎。