研究人员说，在1万6千多名参与疫苗试验的泰国志愿者中，疫苗使感染风险降低了31%以上。泰国疾病管制部门主管形容这个结果是科学上可信的突破。
美国军方科研人员赞助了这项6年的试验。他们说，两种药物的混合降低了艾滋病感染的机率。科学家说，这个结果使研制疫苗的工作取得重大进展。
U.S. and Thai researchers say an experimental AIDS vaccine has for the first time cut the risk of HIV infection by almost a third. Thai Health Minister Withaya Kaewparadai announced the results at a press conference Thursday in Bangkok.
The researchers say the vaccine lowered the risk of infection by more than 31 percent among more than 16,000 Thai volunteers who participated in the trial. The director general of Thailand's Department of Disease Control, Somchai Chakrabhand, described the results as a scientifically credible breakthrough. He said among the volunteers, 51 taking the vaccine became infected with HIV compared with 74 who received placebos.
U.S. Army researchers sponsored the six-year trial. They say a combination of two drugs lowered the rate of HIV infection, an outcome scientists call a major step forward in the search for a vaccine.
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