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IL-6 production in mouse macrophage cells and kidney epithelial cells following WNV infection. Culture supernatant was harvested from mock, WNV NY99 or WNV H8912 infected macrophage cells (A) and kidney epithelial cells (B) at days 4 and 6 post-infection. IL-6 production was measured by Bioplex. Data are presented as means ± SEM, n = 6. **P < 0.01 compared to WNV NY99 strain-infected cells.
