[Kit cat]

I thought that freezing, or boiling temperatures killed food born bacteria????

[srmorton]

Cold temperatures may not actually kill bacteria, but it will prevent the organism from multiplying. Listeria monocytogenes is very unusual in that it's growth is enhanced by cold temperatures. Even if the report does not mention Listera, any time refrigerated or frozen food is implicated as the source of an outbreak of food poisoning, this organism would be the most likely cause.