Question

Who spread the Black Death throughout China?

Answer 1

Many scholars believe that the bubonic plague began in north-western China.
https://www.thoughtco.com/black-death-in-asia-bubonic-plague-195144

Explanation:

Further discussion and maps here:
https://contagions.wordpress.com/2011/11/26/did-india-and-china-escape-the-black-death/