Dr. Oz Answers Your Questions
In a word, no.
Dr. Oz says you can eat all the sushi you want without worrying about getting a parasite. "There's no question when the fish die there are often parasites in the gut that will go into the meat," Dr. Oz says. "But all the fish—sushi—that's served in this country is supposed to be frozen before you eat it. … It keeps it tasting fresh but it also kills the parasites, which is why they do it."
If for some reason the fish wasn't flash frozen, Dr. Oz says any well-trained sushi chef should be able to identify it as possibly harmful.