Treatment
|
Indicator Strain
|
Inhibition zone by
|
---|
|
I2
|
I5
|
I8
|
I13
|
c3
|
c14
|
---|
Untreated
|
E. coli
|
+++
|
+++
|
++
|
++
|
+++
|
++
|
E. coli O157: H7
|
++
|
++
|
++
|
++
|
++
|
++
|
E. faecalis
|
++
|
++
|
++
|
++
|
++
|
++
|
S. Typhimurium
|
++
|
++
|
++
|
++
|
+
|
+
|
S. Enteritidis
|
+
|
++
|
++
|
++
|
++
|
+
|
L. monocytogenes
|
++
|
++
|
+++
|
++
|
+
|
++
|
Neutralized
|
E. coli
|
̶̶
|
̶̶
|
+
|
++
|
̶̶
|
̶̶
|
E. coli O157: H7
|
̶̶
|
̶̶
|
̶̶
|
+
|
̶̶
|
̶̶
|
E. faecalis
|
̶̶
|
̶̶
|
+
|
++
|
̶̶
|
̶̶
|
S. Typhimurium
|
̶̶
|
̶̶
|
̶̶
|
+
|
̶̶
|
̶̶
|
S. Enteritidis
|
̶̶
|
̶̶
|
̶̶
|
+
|
̶̶
|
̶̶
|
L. monocytogenes
|
̶̶
|
̶̶
|
̶̶
|
̶̶
|
̶̶
|
̶̶
|
Heat treated
|
E. coli
| |
++
|
+++
|
++
|
++
|
+++
|
+++
|
E. coli O157: H7
|
++
|
++
|
++
|
++
|
++
|
+++
|
E. faecalis
|
++
|
++
|
++
|
++
|
++
|
+++
|
S. Typhimurium
|
++
|
++
|
++
|
++
|
+
|
+++
|
S. Enteritidis
|
+
|
++
|
++
|
++
|
++
|
+++
|
L. monocytogenes
|
++
|
++
|
+++
|
++
|
++
|
+++
|
Catalase treated
|
E. coli
| |
+++
|
+++
|
++
|
++
|
+++
|
++
|
E. coli O157: H7
|
++
|
++
|
++
|
++
|
++
|
++
|
E. faecalis
|
++
|
++
|
++
|
++
|
++
|
++
|
S. Typhimurium
|
++
|
++
|
++
|
++
|
+
|
+
|
S. Enteritidis
|
+
|
++
|
++
|
++
|
++
|
+
|
L. monocytogenes
|
++
|
++
|
+++
|
++
|
+
|
++
|
- Symbols show zones of inhibition (mm): ̶̶, no inhibition; +, weak (< 14); ++, good (15–19); +++, strong (> 20), Neutralized; supernatant treated with 6 N NaOH to obtained a pH 7, heat treated; Supernatants boiled for 10 min, Catalase treated; supernatant treated with 0.5 mg/ml catalase