72 hours visa - Doubt

Hi,

Im going to Shangai the next 1st of December (from Berlin - Germany), staying less than 72 hours and heading to Hong kong(no visa required)! Everything is ok so far, right ?

However, I`m braziliana and they say that in m,y country I need to take the Yellow fever shot, but the point is, I have been living in germany for 6 mntha and the shot its not required in Germany. In this case, do I need this shot or not?

Thanks, Andre