Eggs, meat, unpasteurized cheese, and seafood are common sources of the bacteria that can cause travelers' diarrhea, and they should be properly prepared or avoided.

Raw milk and unpasteurized cheese can also spread the bacteria.

Although unpasteurized granular cheese is ready to eat after 60 days of curing, it has a very mild flavor unless aged further to increase sharpness.

Lactose intolerance in particular irritates him, as does the government's squeamishness about allowing the import of unpasteurized cheeses.

And there is an import ban on unpasteurized cheeses from England and from parts of France and the Netherlands.

"Just try to buy unpasteurized cheese in England, or to eat salad in France when you're pregnant," wrote a friend living in York, England.

Recent cases have been associated with ingestion of unpasteurized fresh cheese from Mexico (166).

However, the United States' Food and Drug Administration (FDA) places the same regulations on all unpasteurized cheeses.

Listeriosis is caused by a bacterium, Listeria monocytogenes, that sometimes grows in hot dogs, cold cuts, ice cream and soft, unpasteurized cheese like brie.

Sainte-Maure de Touraine is an unpasteurized cheese made from full fat goat's milk.