[Epidemiological analysis on recent infected HIV-1 patients among newly reported HIV cases in Beijing, from 2009 to 2011].

ABSTRACT

OBJECTIVE: To understand the epidemiologic characteristics on newly reported HIV cases and those recently infected HIV-1 cases in the past few years in Beijing so as to find out their correlates. METHODS: All the qualified newly reported HIV serum samples from both the first quarters of 2009, 2010 and the second quarter of 2011 in Beijing, were tested using the BED HIV-1 incidence capture enzyme immunoassay (BED-CEIA) to identify those recent HIV-1 infection (BED positive) samples and related socio-demographic characteristics. The proportions of BED positives were determined and the correlates analyzed by SPSS software. RESULTS: The Annual qualified newly reported HIV serum samples of each year from Beijing were 274, 236 and 356, with BED positive rate among them as 35.0%, 31.8% and 33.7%, respectively. The majority of newly reported HIV cases of each year were males (89.1%, 88.6%, 91.9%), range of age as 20-39 years (77.4%, 75.8%, 82.0%), Han nationality (77.7%, 88.6%, 85.7%), and most of them were not permanent residents of Beijing (74.1%, 80.5%, 2011 data missed). The proportions of patients through sexual transmission showed upward trend (67.5%, 76.2%, 86.8%). Especially in the 'man having sex with man' (MSM)group, it showed a significantly increase (44.9% , 45.3% , 62.6%). The proportions of injection drug users (15.3%, 8.1%, 9.0%)declined to some extent during this period. Data from statistics indicated that the proportions of BED positives among newly reported HIV cases of each year were significantly correlated to factors as patients' sex, transmission route and source of samples, but not significantly correlated to patents' age or marital status. Male cases accounted for 96.9% and MSM accounted for 73.5% of all the BED-positives during 2009-2011. CONCLUSION: MSM accounted for both large portion of newly reported HIV cases and recent HIV-1 infections which suggested an increasing trend in 2009-2011. It seemed that the characteristic and changing trends of HIV epidemic in Beijing was oriented by MSM population in the last years.