FIGURE 4.

Inhibition of Listeria replication by human CD4⁺ T cells secreting IFN-γ and TNF-α. THP-1 cells were infected with Listeria innocua in the absence or presence of recombinant cytokines (A) or 50% (v/v) T cell conditioned media (B) for 16 hours. Cell monolayers were harvested, and L. innocua was quantified by colony-forming assay from cell lysates. Data are expressed as mean +/− SEM of three replicates.