All living organisms, including fish, can have parasites. Parasites are a natural occurrence and are not necessarily due to contamination. Parasites are killed during the cooking process and therefore do not present a health concern in thoroughly-cooked fish. Parasites become a concern when consumers eat raw, undercooked, or lightly-preserved fish (e.g., sashimi, sushi, or ceviche). Freezing, as required under the 2010 Regulations, kills any parasites that may be present.