What happens when a patient brings you a 40cm worm in a jar?

The 30-year-old patient had sampled various raw and cured fish dishes in Europe, South America and Asia.
Artist depiction of Diphyllobothrium latum.

ED doctors faced a curly one when a Melbourne woman retrieved 40cm of worm from her stool, stored it in a jar and presented it to them.

It turned out that the well-travelled 30-year-old had sampled various raw and cured fish dishes, including fermented herring (surströmming) in Sweden, cured salmon (gravlax) in Norway and ceviche in South America.