"A total of 17,183 new HIV cases were notified within the 2003-2010 period. The annual rates of newly-diagnosed cases per million inhabitants ranges from 96.4 in 2003 to 90.0 in 2009 and 88.5 in 2010.
"Situation by transmission categories (2010): Transmission among males who have sexual relationships with males was the most frequent (46.1%), followed by heterosexual transmission, which totalled 33.1%, and that of injecting drug users, which amounted to 5.9% (Fig. 6.2). Therefore, 79.0% of the newly-diagnosed HIV cases for 2010 were sexually-transmitted. Breaking the transmission categories down by gender, among males, homosexual transmission totals 56.0% of the newly-diagnosed HIV cases and heterosexual transmission, 23.0%. Among females, the vast majority entail heterosexual transmission, totalling 80% of the newly-diagnosed cases (Fig. 6.3).
"Time Trend (2004-2010 Period): The trend in the rates of newly-diagnosed HIV cases vary depending on the mechanism of transmission: Among injecting drug users, the downward trend is continuing regarding the number of newly-diagnosed HIV cases (18.9 / million inhabitants in 2004 compared to 6.7 /million inhabitants in 2010), whilst the rates are tending to stabilize in the case of heterosexual transmission and are clearly rising in homosexual transmission among males."

Source

Government Delegation of National Plan on Drugs (Reitox National Focal Point for Spain), "2012 National Report (2011 Data) to the EMCDDA: Spain: New Development, Trends and in-depth information on selected issues" (Madrid, Spain: DGPNSD, Dec. 2012), pp. 143-144.
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