2009 Sexually Transmitted Diseases Surveillance

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I don't know why Baltimore has the highest Syphilis and HIV co-infection rate. Anyways, I hope this helps.

 

http://www.cdc.gov/std/stats09/msm.htm

 

"Notifiable disease surveillance data on syphilis and data from GISP suggest that some STDs in MSM, including men who have sex with both women and men, are increasing.1–4 Because STDs and the behaviors associated with acquiring them increase the likelihood of acquiring and transmitting HIV infection,5 the rise in STDs among MSM may be associated with an increase in HIV diagnoses among MSM.6

 

With the exception of reported syphilis cases, most nationally notifiable STD surveillance data do not include information on sexual behaviors; therefore, data on national trends in STDs among MSM in the United States are not currently available. Furthermore, testing strategies are often suboptimal for detecting STDs in MSM. Testing for gonorrhea and chlamydia in MSM largely focuses on detecting urethral infections, which are more likely to be symptomatic than pharyngeal or rectal infections.7 Data from enhanced surveillance projects are presented in this section to provide information on STDs in MSM."