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Food Microbiology > Listeria > Flashcards

Flashcards in Listeria Deck (9):

What temperatures can Listeria grow in?

See top slide on pg 4.


What kinds of foods is Listeria monocytogenes associated with?

See top slide of pg 7.


How does Listeria infect immunocompromised individuals? Why is this different from healthy adults?

See bottom slide on pg 5 and top slide on pg 6.


What is meant by a "saprotroph", and how does this relate to Listeria monocytogenes?

Saprotrophs are organisms found on dead and decaying material, and this is the natural reservoir for Listeria monocytogenes.


What is especially noteworthy about the growth temperature and inhibitory salt concentrations for Listeria monocytogenes?

Grows at low temperatures, and at high salt concentrations; for specifics, see slide 7


What is meant by "YOPI"?

Young, old, pregnant, immunocompromised. How does this relate to Listeria monocytogenes, and what other organisms discussed this semester also have this characteristic?


How does Listeria monocytogenes infection differ between YOPIs and healthy adults?

See slide 10.


How do US regulations differ from Europe in terms of Listeria monocytogenes presence in foods?

See top slide of page 8


What are three common ways regulatory agencies would like industry to prevent Listeria monocytogenes in foods?

Use lethality step in process, add an antimicrobial, and/or have an excellent sanitation program in place.