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Human immunodeficiency virus prevalence was correlated with syphilis prevalence in the Northwest (r = 0.82, P = .0253), East (r = 0.78, P = .0004), and South-central (r = 0.63, P = .0276) regions. Pearson correlation coefficients are denoted as r and symbols represent individual cities. Lhasa City was treated as an outlier. Abbreviation: HIV, human immunodeficiency virus.
