I doubt that an infection with anything but AIDS would be a visa issue. I wouldn’t worry about the visa implications too much, if you have a health problem get it checked out.
To the end of 2011. 790,000AID survive patient in China, new patient 48,888 a year . 28,000 died already.
That’s probably a conservative estimate, even though the percentage of people infected in China is very low (0.1%). In the 1990’s, hundreds of thousands (or millions) of people in rural China were infected with HIV through state-run blood collection programs which pooled contaminated blood. Whoops!