Gram Positive Bacilli
Which of the following best describes L. monocytogenes? (AIIMS May 2011)
|A||Flagella are produced both at room temperature and at 370C|
|B||Listeria are facultative intracellular pathogens|
|C||Listeria cannot be cultivated on artificial media|
|D||once infected, the immune system cannot destroy Listeria|
a. Listeria are facultative intracellular pathogens
b. Listeria multiply both extracellularly and intracellularly; but under most circumstances a competent immune system eliminates Listeria. As expected, listeriosis is mostly seen in the very young and the very old, and in people with compromised immune systems.
c. Reports of Listeria food outbreaks have implicated such foods as coleslaw and milk products, especially if not pasteurized.
d. It is cultivable on blood agar, on which it is beta hemolytic.