Education · Interactive Guide

Parasitic Worms in the Human Body

Symptoms, how they spread and how to prevent them, explored in 3D

The Parasite Explorer: a see-through 3D body with a tapeworm in the small intestine

Explore · 3D

Parasite Explorer

A see-through 3D body with eight animated worms, 21 species to explore, a symptom detective with 16 cases, and myth checks.

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The Resonant Mission: flying through the large intestine with the Resonator visor

Play · 2 levels

The Resonant Mission

Solve the case, shrink down and fly through the large intestine. Level 2 is the night shift, with eggs and two programs to switch between.

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Fiction The Resonator and its frequencies are invented for the games. The facts about the worms are real and sourced.

Quick Answer

Parasitic worms are roundworms (nematodes) and flatworms (tapeworms and flukes) that can live in the human body. One of the most common in Europe is the pinworm, especially in children. Most worm infections cause no symptoms at all, and symptoms like stomach ache, itching or tiredness almost always have other, more common causes. Worms mostly spread through eggs on hands, food or soil, through undercooked meat or fish, or through insect bites, and everyday habits like washing hands and cooking meat and fish well prevent most of them.

The worms, one by one

21 parasitic worms: where they live and how to prevent them

Known Every fact below comes from the CDC or WHO.

Roundworms (nematodes)

Giant roundworm

Ascaris lumbricoides

Lives in
Small intestine (larvae pass through the liver and lungs)
Size
Females 20–35 cm, males 15–30 cm
Spread by
Swallowing eggs from soil on food or hands
Prevent
Wash hands with soap, wash or cook vegetables, and use toilets so eggs don't reach the soil.

Pinworm

Enterobius vermicularis

Lives in
Large intestine; females lay eggs around the anus at night
Size
Females 8–13 mm, males 2–5 mm
Spread by
Eggs on fingers, bedding and house dust
Prevent
Wash hands after the toilet and before eating, keep nails short, and wash bedding and pyjamas.

Whipworm

Trichuris trichiura

Lives in
Large intestine (caecum, colon, appendix)
Size
3–5 cm
Spread by
Swallowing eggs from soil
Prevent
Wash hands, wash or cook vegetables, and use toilets.

Threadworm

Strongyloides stercoralis

Lives in
Small intestine
Size
2–3 mm
Spread by
Larvae in soil enter through the skin
Prevent
Wear shoes on soil in warm regions, and use toilets.

Hookworm

Ancylostoma duodenale

Lives in
Small intestine
Size
About 1 cm (8–15 mm)
Spread by
Larvae in soil enter through bare skin
Prevent
Wear shoes on soil in warm regions, and use toilets.

New World hookworm

Necator americanus

Lives in
Small intestine
Size
About 1 cm (5–11 mm)
Spread by
Larvae in soil enter through bare skin
Prevent
Wear shoes on soil in warm regions, and use toilets.

Dog & cat roundworm

Toxocara canis / cati

Lives in
Larvae wander through organs such as the liver and lungs, and sometimes the eye
Size
Larvae, too small to see
Spread by
Eggs from dog or cat faeces in soil and sandpits
Prevent
Deworm pets, pick up dog poo, cover sandpits, and wash hands after playing outside.

Herring worm

Anisakis simplex

Lives in
Burrows into the stomach or intestinal wall
Size
Larvae about 2 cm
Spread by
Raw or undercooked sea fish
Prevent
Freeze fish before eating it raw, or cook it well.

Lymphatic filaria

Wuchereria bancrofti

Lives in
Lymph vessels
Size
Females 8–10 cm, males about 4 cm
Spread by
Mosquito bites
Prevent
Avoid mosquito bites (nets, repellent).

Malayan filaria

Brugia malayi

Lives in
Lymph vessels
Size
Females 4–5.5 cm, males 1.3–2.3 cm
Spread by
Mosquito bites
Prevent
Avoid mosquito bites (nets, repellent).

African eye worm

Loa loa

Lives in
Tissue under the skin; sometimes crosses the eye
Size
3–7 cm
Spread by
Bites of deer flies (Chrysops) in Central and West Africa
Prevent
Avoid fly bites with long clothing and repellent.

River blindness worm

Onchocerca volvulus

Lives in
Nodules under the skin; larvae in skin and eyes
Size
Females 33–50 cm, males 2–4 cm
Spread by
Bites of blackflies (Simulium) near fast-flowing rivers
Prevent
Avoid blackfly bites.

Guinea worm

Dracunculus medinensis

Lives in
Under the skin; leaves the body through the leg or foot
Size
Females 70–120 cm
Spread by
Drinking water containing tiny water fleas
Prevent
Filter drinking water, and keep people with an emerging worm out of water sources.

Trichina worm

Trichinella spiralis

Lives in
Adults in the small intestine; larvae curl up in muscle
Size
Adults 1.2–2.2 mm
Spread by
Undercooked pork or wild boar
Prevent
Cook pork and wild game well. Meat inspection made it rare in Europe.

Flatworms (tapeworms and flukes)

Beef & pork tapeworm

Taenia saginata / solium

Lives in
Small intestine
Size
Usually 2–8 m (beef tapeworm rarely up to 25 m)
Spread by
Raw or undercooked beef (saginata) or pork (solium)
Prevent
Cook beef and pork well, and wash hands (pork tapeworm eggs spread from person to person).

Dog tapeworm

Echinococcus granulosus

Lives in
Cysts mostly in the liver and lungs
Size
Adult 2–7 mm; cysts can grow to many cm
Spread by
Eggs from dog faeces
Prevent
Deworm dogs, don't feed them raw offal, and wash hands after touching dogs.

Liver fluke

Fasciola hepatica

Lives in
Bile ducts of the liver
Size
Up to 3 cm long, 1.5 cm wide
Spread by
Watercress and other water plants
Prevent
Don't eat raw watercress or other water plants from areas with sheep or cattle.

Blood fluke (bilharzia)

Schistosoma spp.

Lives in
Veins around the intestine or the bladder
Size
Males 6–12 mm, females 7–17 mm
Spread by
Larvae in fresh water enter through the skin
Prevent
Avoid swimming or wading in fresh water in affected areas.

Chinese liver fluke

Clonorchis sinensis

Lives in
Small and medium bile ducts of the liver
Size
1–2.5 cm
Spread by
Raw or undercooked freshwater fish
Prevent
Cook freshwater fish well.

Cat liver fluke

Opisthorchis viverrini / felineus

Lives in
Bile ducts of the liver
Size
0.5–1.2 cm
Spread by
Raw or undercooked freshwater fish
Prevent
Cook freshwater fish well.

Fish tapeworm

Dibothriocephalus latus (was Diphyllobothrium latum)

Lives in
Small intestine
Size
2–15 m, with over 3,000 segments
Spread by
Raw or undercooked freshwater fish
Prevent
Cook or properly freeze freshwater fish.

Symptoms

Most people with worms feel nothing

For many worms, most infections cause no symptoms at all. When they do, it depends on the worm: stomach ache, an itchy bottom at night (pinworm), an itchy rash where larvae entered the skin (hookworm), or swelling of the legs over many years (lymphatic filariasis).

A few worms are known to affect sleep and mood too. Pinworm itching at night disturbs sleep and makes children cranky, and cysts from pork tapeworm eggs in the brain can cause epilepsy. Popular online claims such as "worms cause sugar cravings" have no research behind them.

The Parasite Explorer lists the symptoms per worm, each one labelled as known or unproven, and its Detective tab turns them into cases to solve.

Educational only. These symptoms almost always have other, more common causes. This game does not diagnose, treat or give medical advice. If you are worried about your health, see a doctor.

How we label everything

Fact or fiction?

Known Established science, with a source for every parasite.

Fiction Invented to make the games fun:

  • The frequency button, the beam, the glow and the dissolving worms are invented for the game. This game makes no claim that frequencies treat, heal or remove anything.
  • The numbers on the frequency slider have no meaning. Every value gives the same result in the game.
  • All parasites are shown in one body at the same time. In reality nobody has all of them at once.
  • Sizes, colours and movements are stylised. Tapeworms are shown far shorter than their real length of metres, and tiny worms are shown larger so you can see them.
  • The body and organs are simplified shapes, not an anatomical model.

To do Open questions:

  • Emolio has not tested any frequency on any of these parasites. Our in vitro work so far is with other micro-organisms.
  • If we ever test frequencies on parasites, we will publish the method and all results here, including results that show no effect, before the game says anything about it.
  • Have every fact checked by a parasitologist or doctor.

Frequently Asked

What are parasitic worms?

Worms that live in or on another living thing and feed on it. In people there are two big groups: roundworms (nematodes), such as the pinworm and the giant roundworm, and flatworms, which include tapeworms and flukes. Our explorer covers 21 of them.

Can you have worms without any symptoms?

Yes. According to the CDC, most infections with the giant roundworm, the whipworm and the dog roundworm cause no symptoms at all. That is why a list of symptoms says very little on its own.

What symptoms can parasitic worms cause?

It depends on the worm: stomach ache, diarrhoea, an itchy bottom at night (pinworm), an itchy rash where larvae entered the skin (hookworm), or swelling of the legs (lymphatic filariasis). Some also affect sleep and mood: pinworm itching disturbs sleep and makes children irritable, and pork tapeworm cysts in the brain can cause epilepsy (WHO). These symptoms almost always have other, more common causes.

How do pinworms spread?

Through their eggs. At night the females lay eggs around the anus, which causes itching. Scratching puts eggs on the fingers, and from there they reach bedding, house dust and other people in the family.

How can you prevent worm infections?

Wash hands with soap after the toilet and before eating, wash or cook vegetables, cook meat and fish well (or freeze fish before eating it raw), wear shoes on soil in warm regions, deworm pets and pick up after them, and avoid swimming in fresh water in areas where blood flukes occur.

Is the Resonator in the game real?

No. The Resonator, its beam and the frequencies in its visor are invented for the game. The game makes no claim that frequencies treat, heal or remove anything. The facts about the worms are real and sourced.

Sources

These facts were compiled from CDC and WHO pages and have not yet been reviewed by a parasitologist or doctor.

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