TABLE 3.
Antibacterial activity of cell‐free supernatants from S. thermophilus strains against different food pathogens
| Cell‐free supernatant strain code | Indicator strain (Pathogen) | |||
|---|---|---|---|---|
| E. coli ATCC25922 | L. monocytogenes ATCC19115 | P. aeruginosa ATCC25923 | S. aureus ATCC6538 | |
| RIY | − | ++ | ++ | + |
| RIK | ++ | ++++ | +++ | ++ |
| RIHQ3 | + | +++ | − | ++ |
| RIM | + | +++ | ++ | +++ |
| RIRT | + | ++ | + | + |
| RIRT2 | + | ++++ | + | +++ |
| RIH1 | + | +++ | − | ++ |
| RIH3 | − | +++ | + | ++ |
| RIH4 | − | +++ | ++ | + |
| RIR1L | ++ | +++ | +++ | ++ |
Zone of inhibition (−) = no activity, (+) = visible inhibition, 1–4 mm (++), 5–12 mm (+++), ≥13mm (++++) (Mahmood et al., 2013).