The World Health Organization says China has agreed to hand over bird flu virus samples that W. H. O. scientists have been requesting since last year.
世界卫生组织说，中国同意向世卫组织递交该组织去年起就一直要求的禽流感病毒样本。
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The W. H. O. 's representative in China, Henk Bekedam, said Friday that the Chinese Ministry of Agriculture has assured his office that it has shipped 20 bird flu virus samples from 2004 and 2005.
METHODS:Newcastle dis-ease virus(NDV)vaccine was used as model drug, and PLGA as carrying agent to prepare NDV-PLGA oral microspheres by W/O/W emulsifying-solvent evaporation technique.