BioControl products for testing:

Assurance GDS for Listeria spp.
(AOAC Performance Tested Method 070701)

Assurance GDS for Listeria monocytogenes
(AOAC Performance Tested Method 070702)

Assurance Listeria EIA
(AOAC Official Method 996.14)

VIP for Listeria
(AOAC Official Method 997.03)

Name:
Listeria

Under the scope:
Gram positive, non-spore forming, short straight rods usually motile

On the plate:
MOX, Oxford Agar and PALCAM: typical colonies have black precipitate (black haloes)

In the incubator:
Optimal growth at 30-37° C. Motility inhibited at 37° C.

Illnesses caused:
Meningitis, septicemia and spontaneous abortion

In the kitchen:
Outbreaks have been associated with: turkey, frankfurters, alfalfa tablets, meat products, ready to eat prepared meats, fermented sausage, poultry, coleslaw, milk, and Mexican-style cheese.

Challenges of testing:
Listeria grows slowly, rate is about half that of other pathogens. A test must have an enrichment protocol that promotes growth of Listeria while suppressing the growth of competitive organisms.

More information:
1-800-245-0113
BioControl Technical Support