Those who prefer the safe side can stick with adequately frozen or cooked fish, according to the CDC. Broad tapeworms are the largest type that can infect people. It can grow up to 30 feet long. However, in 1986, researchers found out that there was another species of the same family which was later called the Japanese broad tapeworm.
"For decades, the possible occurrence of the Japanese broad tapeworm on the Pacific coast of North America was ignored, but since 2008, human infection with adult tapeworms and natural infection of carnivores (wolves and bears) with adult tapeworms have been confirmed by use of molecular markers", the researchers wrote in the published study. They measure between 8 to 15 millimetres and continuously elongate and contract. In one case, a tapeworm was found within the muscles of a Pacific pink salmon, quite close to the fish's spine. Some feel a little bit of abdominal discomfort, some have nausea or loose stools, and some even lose a little weight.
Complications brought about by tapeworm infection include intestinal obstruction and gall bladder disease that is caused by the migration of proglottids.
After discovering that you're infected, you can collect a sample from your toilet bowl and send it to a lab for testing, and then, with your doctor's help, the tapeworm can be identified and "treated very effectively", Schaffner said.
Therefore, if you eat uncooked or raw fish in any form, you ought to be careful as you might be in danger of developing an infection if the fish carries the Japanese parasites. Medications are available to treat those infected with the parasite.
The risk of becoming infected with the Japanese tapeworm parasite is most prevalent when consuming raw or undercooked fish, particularly in dishes such as sushi, sashimi and ceviche.