What is the definition of Fish Tapeworm Infection?

Fish tapeworm infection is an intestinal infection with a parasite found in fish.

What are the alternative names for Fish Tapeworm Infection?

Diphyllobothriasis

What are the causes for Fish Tapeworm Infection?

The fish tapeworm (Diphyllobothrium latum) is the largest parasite that infects humans. Humans become infected when they eat raw or undercooked freshwater fish that contain fish tapeworm cysts.

The infection is seen in many areas where humans eat uncooked or undercooked freshwater fish from rivers or lakes, including:

  • Africa
  • Eastern Europe
  • North and South America
  • Scandinavia
  • Some Asian countries

After a person has eaten infected fish, the larva begins to grow in the intestine. Larvae are fully grown in 3 to 6 weeks. The adult worm, which is segmented, attaches to the wall of the intestine. The tapeworm may reach a length of 30 feet (9 meters). Eggs are formed in each segment of the worm and are passed in the stool. Sometimes, parts of the worm may also be passed in the stool.

The tapeworm absorbs the nutrition from food that the infected person eats. This may lead to vitamin B12 deficiency and anemia.

What are the symptoms for Fish Tapeworm Infection?

Most people who are infected have no symptoms. If symptoms do occur, they may include:

  • Abdominal discomfort or pain
  • Diarrhea
  • Weakness
  • Weight loss

What are the current treatments for Fish Tapeworm Infection?

You will receive medicines to fight the parasites. You take these medicines by mouth, usually in a single dose.

The drug of choice for tapeworm infections is praziquantel. Niclosamide can also be used. If needed, your health care provider will prescribe vitamin B12 injections or supplements to treat vitamin B12 deficiency and anemia.

What is the outlook (prognosis) for Fish Tapeworm Infection?

Fish tapeworms can be removed with a single treatment dose. There are no lasting effects.

What are the possible complications for Fish Tapeworm Infection?

Untreated, fish tapeworm infection may cause the following:

  • Megaloblastic anemia (anemia caused by vitamin B12 deficiency)
  • Intestinal blockage (rare)

When should I contact a medical professional for Fish Tapeworm Infection?

Call your provider if:

  • You have noticed a worm or segments of a worm in your stool
  • Any family members have symptoms of anemia

How do I prevent Fish Tapeworm Infection?

Measures you can take to prevent tapeworm infection include:

  • Do not eat raw or undercooked fish.
  • Cook fish at 145°F (63°C) for at least 4 minutes. Use a food thermometer to measure the thickest part of the fish.
  • Freeze fish at -4°F (-20°C) or below for 7 days, or at -35°F (-31°C) or below for 15 hours.
Antibodies

REFERENCES

Alroy KA, Gilman RH. Tapeworm infections. In: Ryan ET, Hill DR, Solomon T, Aronson NE, Endy TP, eds. Hunter's Tropical Medicine and Infectious Disease. 10th ed. Philadelphia, PA: Elsevier; 2020:chap 130.

Fairley JK, King CH. Tapeworms (cestodes). In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 289.

  • Journal: Zhongguo xue xi chong bing fang zhi za zhi = Chinese journal of schistosomiasis control
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Construction of a cDNA library for Sparganum mansoni and screening of diagnostic antigen cadidates.

There are no recent clinical trials available for this condition. Please check back because new trials are being conducted frequently.