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Which of the following is a source of Anisakis simplex?

  1. Under cooked vegetables

  2. Raw, undercooked, or improperly frozen fish

  3. Contaminated water

  4. Processed meats

The correct answer is: Raw, undercooked, or improperly frozen fish

Anisakis simplex is a parasitic nematode commonly associated with marine fish and seafood. When consumed in raw, undercooked, or improperly frozen fish, it can lead to anisakiasis, a type of foodborne illness that can cause gastrointestinal symptoms. The lifecycle of Anisakis involves fish, where the larvae reside in the tissues of marine species. For effective food safety, ensuring that fish is cooked to the proper temperature or properly frozen to kill parasites is essential. While other choices might involve food safety concerns, they do not relate to Anisakis simplex. Undercooked vegetables, contaminated water, and processed meats do not serve as sources of this specific parasite, which is exclusively linked to certain seafood. Thus, identifying raw, undercooked, or improperly frozen fish as the source aligns with the scientific understanding of this parasite's transmission.