To investigate the prevalence of drug-resistance mutations,resistance to antiretroviral drugs,and the subsequent virological response to therapy in treatment-naive and antiretroviral-treated patients infected with HIV/AIDS in Henan,China,a total of 431 plasma samples were collected in Queshan county between 2003 and 2004,from patients undergoing the antiretroviral regimen Zidovudine + Didanosine + Nevirapine(Azt+Ddi+Nvp).Personal information was collected by face to face interview.Viral load and genotypic drug resistance were tested.Drug resistance mutation data were obtained by analyzing patient-derived sequences through the HIVdb Program(http://hivdb.stanford.edu).Overall,38.5% of treatment-naive patients had undetectable plasma viral load(VL),the rate significantly increased to 61.9% in 0 to 6 months treatment patients(mean 3 months)(P<0.005)but again significantly decrease to 38.6% in 6 to 12 months treatment patients(mean 9 months)(P<0.001)and 40.0% in patients receiving more than 12 months treatment(mean 16 months)(P<0.005).The prevalence of drug resistance in patients who had a detectable VL and available sequences were 7.0%,48.6%,70.8%,72.3% in treatment-na?ve,0 to 6 months treatment,6 to 12 months treatment,and treatment for greater than 12 months patients,respectively.No mutation associated with resistance to Protease inhibitor(PI)was detected in this study.Nucleoside RT inhibitor(NRTI)mutations always emerged after non-nucleoside RT inhibitor(NNRTI)mutations,and were only found in patients treated for more than 6 months,with a frequency less than 5%,with the exception of mutation T215Y(12.8%,6/47)which occurred in patients treated for more than 12 months.NNRTI mutations emerged quickly after therapy begun,and increased significantly in patients treated for more than 6 months(P<0.005),and the most frequent mutations were K103N,V106A,Y181C,G190A.There had been optimal viral suppression in patients undergoing treatment for less than 6 months in Queshan,Henan.The drug resistance strains were highly prevale
Xin-ping LIP Hui XING Zhe WANG Xue-feng SILian-en WANG Hua CHENG Wei-guo CUI Shu-lin JIANG Ling-jie LIAO Hai-wei ZHOU Jiang-hong HUANG Hong PENG Peng-fei MA Yi-ming SHAO
