This is right from the CDC website and the most recent figures (2017):
Chlamydia - Negro women are 5 X more likely to have it than whites
Negro men are 6.6 X more likely
Gonorrhea - Negro women are 7.6 X more likely to have it than whites
Negro men are 8.9 X more likely than whites
Syphilis - Negro women are 5.2 X more likely than whites to have it than whites
Negro men are 4.5 X more likely than white men