[Spatial analysis on the HIV/AIDS infection status among injecting drug users in China, from 2005 to 2011].

Objective: To analyze the spatial distribution of HIV/AIDS epidemics among injecting drug users(IDUs) in China from 2005 to 2011 and to understand its changing trend.

Methods: Using data on people living with HIV and AIDS through injecting drug between 2005 and 2011 to analyze the demographic characteristics of injecting drug users. Analysis on spatial correlation (provincial level and country level) and median center of hot spots(country level)were conducted by Arcgis software.

Results: Sex ratio (male/female) and registered place ratio(province/other provinces)reduced as time went by, with the ratios in 2011 as 6.75 and 7.01 respectively. Tape ratio of the disease between HIV and AIDS showed an upward trend (Z = 26.880, P < 0.01). Since 2005, the identified numbers of HIV/AIDS and the spatial correlation and hot spots in provincial level had reduced, the numbers of provincial hot spots were two from 2009 to 2011(Sichuan and Yunnan provinces)at the national level. However, the spatial correlation and hot spots at the provincial level had an increasing trend. Between 2005 and 2011, the Western Median Centers of hot spots was located in Xinjiang province while the Southwestern Median Center of hot spots tended to move towards the north.

Conclusion: The demographics changes of HIV/AIDS infection among injecting drug users seemed to be regular from 2005 to 2011. Spatial correlation at the provincial level was reducing. However, the spatial correlation and the numbers of hot spots at the country level increased, with hot spots at the country level tended to move from the border areas towards inland.