title: The prevalence of transmitted HIV drug resistance among MSM in Anhui province, China.
abstract: BACKGROUND
  To optimize treatment regimens, we assessed human immunodeficiency virus (HIV) diversity and the prevalence of transmitted drug resistance (TDR) among men who have sex with men (MSM) in Anhui province, China.
  
  
  METHODS
  A total of 139 MSM who were newly diagnosed and antiretroviral treatment-naive were enrolled in Anhui in 2011. A partial pol fragment was amplified and sequenced, and HIV subtypes were determined by phylogenetic analyses. Surveillance/transmitted drug resistance mutations (SDRMs) were identified according to the 2009 World Health Organization (WHO) list.
  
  
  RESULTS
  A total of 133 (95.7%) samples were successfully amplified and sequenced. Based on phylogenetic analyses of the pol fragment, CRF01_AE accounted for 55.6% (74/133) of the infections, followed by CRF07_BC with 32.3% (43/133), B with 5.3% (7/133), and unique recombinant forms with 6.8% (9/133). A total of 3.0% (4/133) of the subjects were found to harbor HIV variants with SDRMs, including 1.5% with NRTI-related mutations and 1.5% with NNRTI-related mutations. PI-related mutations were absent. The SDRMs included L210W (1.5%), Y181C (0.8%), and G190A (0.8%).
  
  
  CONCLUSIONS
  In Anhui, CRF01_AE strains contributed to most of the HIV infections among MSM, and the prevalence of TDR was relatively low in this population. Further studies should be performed to evaluate the trend of TDR among MSM in Anhui and to inform first-line antiretroviral treatment.
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Yuelan
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Su
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Yizu
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jin
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Lifeng
authors.initials: L
authors.lastname: Miao
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Aiwen
authors.initials: A
authors.lastname: Liu
authors.affiliation: Department of HIV&AIDS, Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, Anhui, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Cheng
keywords: HIV; MSM; Prevalence; Transmitted drug resistance; Treatment-naive