We say nothing after sneeze. We don't have this kind of culture. Although when I was a child, adults would say "bǎi suì" when babies sneezed for the first time, and say "qiān suì" for the second time. "bǎi suì" means "one hundred years old" "qiān suì" means "one thousand years old" I guess it was kind of bless on babies. Sneeze usually says that you don't feel well or get a cold, so adults said that to babies to pray for their health, hope they can live longer, longer than 100 year-old and even 1000 year-old. Although it's impossible. I don't think people still do it nowadays. People in some rural areas may still do it, I'm not sure.

In Taiwan,most people say nothing after sneeze.maybe some people will ask "are you okay?get cold?"

Man kann bau3 zhung4 sagen, es bedeutet das Gleiche wie Gesund bleiben, aber man tun es einfach nicht. Zwischen Freunden sagen wir ni3 zo3 kai zum Spaß, es bedeutet geh weg.

As a college student, I got to say their answers are wrong. Among young people, we do say something when someone sneezes. We say:"Someone is missing u". Because we believe that when someone sneezes, it is caused by others who are thinking of you and missing u. Of course, this may only be popular among young people as an innocent joke.

Chinese never say anything in such situation