Growth promotion test according to ISO 11133. |
Inoculum on reference medium - Listeria monocytogenes ATCC 13932 (WDCM 00021) |
10 - 100 |
- Listeria monocytogenes ATCC 19111 (WDCM 00020) |
10 - 100 |
- Listeria innocua ATCC 33090 (WDCM 00017) |
10 - 100 |
Recovery on test medium - Listeria monocytogenes ATCC 13932 (WDCM 00021) |
≥ 70 % |
- Listeria monocytogenes ATCC 19111 (WDCM 00020) |
≥ 70 % |
- Listeria innocua ATCC 33090 (WDCM 00017) |
≥ 70 % |
Colonies - Listeria monocytogenes ATCC 13932 (WDCM 00021) |
blue-green; non-transparent zone |
- Listeria monocytogenes ATCC 19111 (WDCM 00020) |
blue-green; non-transparent zone |
- Listeria innocua ATCC 33090 (WDCM 00017) |
blue-green |
Growth - Escherichia coli ATCC 25922 (WDCM 00013) |
no growth |
- Escherichia coli ATCC 8739 (WDCM 00012) |
no growth |
- Enterococcus faecalis ATCC 19433 (WDCM 00009) |
no growth |
- Enterococcus faecalis ATCC 29212 (WDCM 00087) |
no growth |
Incubation: Listeria 24-48 Std. 37°C aerobic; other strains at least 48 hrs. |