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使用帮助          普特英语口语训练软件!

标题VOA 20090904 分类13 查看2322 上传93

正文

The Chinese bio-technology company Sinovac says its H1N1 vaccine only requires one shot to be effective. This defies previous expectations that vaccines against the so-called swine flu would need two doses to work.


Wang Nan, vice-general manager at Sinovac, says the company began research on the vaccine in early June.


Wang says 21 days after giving subjects the first injections, experimenters tested their blood and discovered that one dose provided the expected level of protection.


Wang says Sinovac will focus on China's market first, but is also interested in selling the vaccine internationally. Sinovac can produce 30 million doses of the vaccine a year.


The Chinese government plans to vaccinate 65 million people against H1N1 this year. The World Health Organization says countries in the northern hemisphere already have ordered more than one billion doses of swine flu vaccine.