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Part of the lifecycle needs dirt. And hogs in the USA are all raised on concrete, so it is basically nonexistent in pork here.

maybe commercial hogs but homestead farmers probably don't raise them on concrete. This is good info to know though!

For those, they tend to deworm. Also, you can destroy the parasites in the meat with the proper freezing protocol.

Or by cooking it well done, which is why you sometimes still hear people say to be careful to cook pork thoroughly.