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Comparative study of cytokine production. BV2 cells were incubated with different SS2 strains at a MOI of 2. The culture supernatants were harvested after 12 h of incubation and analyzed for TNF-α (A) and IFN-γ (B) production by ELISA. The data represent means plus standard deviations from three independent experiments. Statistical significance was determined using Student's t-test (***p < 0.001; ns, no significance).
