FIG 4.

Interactions between pathogens and E. coli BL21 during growth. E. coli BL21 was grown alone or as mixed cultures of E. coli BL21 and either E. faecalis, P. aeruginosa, or S. aureus for 4 h. The numbers of E. coli BL21 cells were determined by selective plating. Results are means ± SEMs (n = 3), and significance was determined using Student's two-tailed t test on raw data. *, P ≤ 0.05 compared to the growth of BL21 alone; **, P ≤ 0.01 compared to the growth of BL21 alone; ns, no significant difference compared to the growth of BL21 alone.