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Alternative way to test the efficacy of swine FMD vaccines: measurement of pigs median infected dose (PID50) and regulation of live virus challenge dose

Dong Li*, Zeng-Jun Lu, Bao-Xia Xie, Pu Sun, Ying-Li Chen, Yuan-Fang Fu and Zai-Xin Liu*

Virology Journal 2010, 7:215  doi:10.1186/1743-422X-7-215