Anonymous wrote:Hard cheeses, even unpasteurized, are fine. Listeria cannot survive the aging process.
This used to be the common wisdom because listeria is uncommon in Europe, where most cheese is unpasteurized, but it's turned out not to be true. (It's part of what sparked the whole FDA outcry against raw milk cheeses last year.) Listeria, E. coli, and salmonella can all survive the aging process.
However, as with meat and eggs and sushi, it's more about the handling of the cheese---you can have contaminated pasteurized cheese (or other foods) if they haven't been properly handled, and a good raw milk cheese producer is going to be extremely careful about contamination (arguably even more so that makers of pasteurized cheeses, since they have a lot more to lose if something goes amiss).