A decreasing trend of syphilis infection was found in both MSM aged < 50 and ≥ 50.
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Compare HIV/syphilis infections between age groups and explore associated factors of HIV/syphilis co-infections among men who have sex with men in Shenzhen, China, from 2009 to 2017.
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The sentences
An increasing trend of HIV prevalence was found in MSM aged < 50.