Education · Interactive Guide
Parasitic Worms in the Human Body
Symptoms, how they spread and how to prevent them, explored in 3D
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.
Open the explorer →
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.
Play the mission →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
- CDC DPDx: Ascariasis
- CDC DPDx: Enterobiasis
- CDC DPDx: Trichuriasis
- CDC DPDx: Strongyloidiasis
- CDC DPDx: Hookworm (intestinal)
- CDC DPDx: Toxocariasis
- CDC DPDx: Anisakiasis
- Wikipedia: Anisakis (history in the Netherlands)
- CDC DPDx: Lymphatic filariasis
- CDC DPDx: Loiasis
- CDC DPDx: Onchocerciasis
- CDC DPDx: Dracunculiasis
- Carter Center: only 10 human Guinea worm cases in 2025
- CDC DPDx: Trichinellosis
- CDC DPDx: Taeniasis
- CDC DPDx: Echinococcosis
- CDC DPDx: Fascioliasis
- CDC DPDx: Schistosomiasis
- CDC DPDx: Clonorchiasis
- CDC DPDx: Opisthorchiasis
- CDC DPDx: Diphyllobothriasis
- WHO fact sheet: Soil-transmitted helminth infections
- WHO fact sheet: Schistosomiasis
- WHO fact sheet: Taeniasis/cysticercosis
- WHO fact sheet: Echinococcosis
- WHO fact sheet: Lymphatic filariasis
- WHO fact sheet: Onchocerciasis
- WHO fact sheet: Dracunculiasis
- WHO fact sheet: Foodborne trematode infections
- Wikipedia: Diphyllobothriasis (vitamin B12 deficiency)
- Wikipedia: Vitamin B12 deficiency (symptoms)
These facts were compiled from CDC and WHO pages and have not yet been reviewed by a parasitologist or doctor.
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