Hyperinfection with Anisakis simplex sensu stricto: observations from a cluster of two cases in France

Anisakidosis is an infection resulting from the ingestion of raw or undercooked fish products infected by Anisakidae larvae. Most infections are self-limiting in humans. We report a case of a 70-year-old woman who developed gastrointestinal symptoms after consumption of home-made ceviche of hake. Forty larvae of Anisakidae were removed during digestive fibroscopy. Based on a molecular method the larvae were identified as Anisakis simplex s. s. A second family member who had eaten the same meal was also diagnosed with anisakidosis. This cluster of two cases underlines the need to raise awareness of this disease in the general population and highlights the importance of cooking fish or freezing it prior to consumption in raw homemade dishes.