Listeria monocytogenes

I just read the following report:
The number of suspected and confirmed cases of listeriosis is expected to increase in the coming weeks because of the bacteria's long incubation period, Canada's health minister said Sunday evening.

You can read the entire report at this link: Listeriosis

The obvious question one should have after reading this is, what is Listeriosis?

What is listeriosis?
Listeriosis, a serious infection caused by eating food contaminated with the bacterium Listeria monocytogenes, has recently been recognized as an important public health problem in the United States. The disease affects primarily persons of advanced age, pregnant women, newborns, and adults with weakened immune systems. However, persons without these risk factors can also rarely be affected. The risk may be reduced by following a few simple recommendations.
Source: CDC This is a great link to find more information.

Here is another link:
Listeria