To determine whether CP4 MVs could induce inflammation reactions in vitro, RAW264.7 cells were seeded in 24-well cell culture plates to 80% confluence. After washing once with DPBS,cells were exposed to 1 g/ml, 5 g/ml or 10 g/ml MVs in fresh medium for 24 h at 37◦C. Supernatants were collected then and the inflammation cytokines of both experimental and control (mediumalone) were determined by Bio-Plex Multiplex Cytokine Assay (Bio-Rad). The serum samples from mice were used to determine the cytokine production in vivo.