For educational purposes only. This page does not provide medical or veterinary advice, diagnosis, or treatment. Always consult a qualified healthcare or veterinary professional before making any health-related decisions.
Roundworm
Ascaris lumbricoides / Toxocara spp.
Size: Visible to naked eye — adults 15–35 cm
Very common — estimated 1.5 billion people infected worldwide
Roundworms are large intestinal nematodes and among the most prevalent parasites on Earth. Adult worms live in the small intestine and can reach 15–35 cm in length. Eggs are shed in feces and can survive in soil for years. In pets, Toxocara species are the most common intestinal parasites and can occasionally infect humans (visceral larva migrans).
Lifecycle
Eggs are ingested from contaminated soil or food. Larvae hatch in the intestine, migrate through the liver and lungs (causing a cough), are swallowed, and mature into adults in the small intestine. Adults produce thousands of eggs daily that pass in feces.
Roundworm — Ascaris lumbricoides / Toxocara spp.
Symptoms
Pharmaceutical treatments
Evidence-based medications used by healthcare and veterinary professionals.
Reference only. Medication names, types, and notes are provided for general awareness. Dosage, suitability, and prescribing decisions must be made by a licensed physician or veterinarian.
Albendazole
Prescription/OTCSingle 400 mg dose for adults; highly effective. First-line treatment for humans.
Mebendazole
OTC100 mg twice daily for 3 days or 500 mg single dose. Widely available.
Pyrantel pamoate
OTC (pets)Common in over-the-counter pet dewormers. Also used in humans in some countries.
Fenbendazole
VeterinaryBroad-spectrum dewormer for dogs and cats. Given over 3–5 days.
Holistic & natural approaches
Traditional, herbal, and integrative approaches for general awareness.
Not a substitute for medical treatment. Natural remedies listed here have not been evaluated by the FDA or equivalent regulatory bodies. Do not use these in place of prescribed treatment. Always consult a qualified healthcare or veterinary professional first.
Papaya seeds
Contain carpaine and benzyl isothiocyanate with antiparasitic properties. Blend seeds with honey and take on an empty stomach. Some small studies show efficacy.
Pumpkin seeds
Contain cucurbitacin, which paralyzes worms. Eat 1–2 oz raw seeds on an empty stomach. Used traditionally in many cultures.
Garlic
Allicin has demonstrated antiparasitic activity in lab studies. Consume 2–3 raw cloves daily or use aged garlic extract.
Wormwood (Artemisia absinthium)
Traditional antiparasitic herb. Available as tea or tincture. Use with caution — can be toxic in high doses.
Dietary fiber increase
High-fiber diet (vegetables, legumes) supports gut motility and creates a less hospitable environment for parasites.
Prevention
Zoonotic risk — can spread between animals and humans
Toxocara species from dogs and cats can infect humans, causing visceral larva migrans — larvae migrate through organs causing fever, cough, and in rare cases, eye damage.
Related parasites
Tapeworm
Taenia spp. / Dipylidium caninum / Echinococcus spp.
Tapeworms are flat, ribbon-like segmented worms that attach to the intestinal wall using suckers and hooks. They have no digestive system and absorb nutrients directly through their skin. Adult worms shed egg-filled segments (proglottids) that look like grains of rice. Some species (Echinococcus) can form dangerous cysts in organs.
Giardia
Giardia duodenalis (syn. G. lamblia, G. intestinalis)
Giardia is a microscopic flagellated protozoan that colonizes the small intestine. It exists in two forms: the active trophozoite (pear-shaped, with two nuclei resembling a face) and the hardy cyst form that can survive in cold water for months. It is a leading cause of waterborne diarrheal illness worldwide.
Toxoplasma
Toxoplasma gondii
Toxoplasma gondii is an obligate intracellular parasite that can infect virtually any warm-blooded animal. Cats are the only definitive host where the parasite reproduces sexually. In most healthy humans, infection causes no symptoms. However, it poses serious risks to pregnant women (congenital toxoplasmosis) and immunocompromised individuals.