How dangerous is diphyllobothrium?

Diphyllobothrium, commonly known as the fish tapeworm, can pose health risks to humans, primarily through the consumption of undercooked or raw fish. While many infections are asymptomatic, some individuals may experience gastrointestinal symptoms such as abdominal pain, diarrhea, or weight loss. In rare cases, it can lead to vitamin B12 deficiency, potentially causing neurological issues. Overall, while it can be harmful, it is generally not life-threatening with proper medical treatment.