[Simon Green]

How can you be sure, you are not ingesting invisible parasites or their eggs with the raw fish?

I can't be sure, any more than I can be sure that I won't be killed by a drunk driver on my way to work.

Neither risk is high enough to make me modify my daily activity.

[entropy12]

I agree that sushi from a reputable source is probably low risk. So is rare steak, and various other delicacies. But accidents are known to happen.