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Can You Make It Through All 26 Of These Disgusting Parasites?

Or in it, in some cases.

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1. Flea (Pulex irritans)

Drawing of a flea by Robert Hooke, from Hooke's Micrographia. Licensed under Public Domain via Wikimedia Commons / Via nmm.ac.uk

There are around 2,000 species of flea. Pulex irritans is known as the "human flea", although it actually makes a home on several species of mammal. Common worldwide.

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8. Demodex folliculorum

"Demodex mite 1" by Joel Mills - Own work. Licensed under CC BY-SA http://3.0 via Wikimedia Commons / Via commons.wikimedia.org

Arachnid mites which live on the skin and have no anus. They just sort of burst when they die and scatter their faeces on the skin. In some cases they cause the skin condition rosacea. About 25% of people have Demodex on their skin – and that number gets higher among older people – but for most people it causes no symptoms.

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9. Entamoeba histolytica

"Entamoeba histolytica 01" by CDC/ Dr. George Healy - This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #http://1474. Licensed under Public Domain via Wikimedia Commons / Via commons.wikimedia.org

A protozoan intestinal parasite, an amoeba, which gets from human to human (and other hosts) through cysts in your poo and again causes diarrhoea. It's most common in poorer countries which lack modern sewage disposal systems.

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16. Tapeworm (Taenia solium)

"Taenia solium scolex" by Rjgalindo from es. Licensed under CC BY-SA http://3.0 via Wikimedia Commons / Via commons.wikimedia.org

They can grow up to 10 metres long. They occur worldwide, but mostly in rural parts of developing countries, especially where pigs are raised.

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19. Whipworm (Trichuris trichiura)

"Trichuris trichiura" by Delorieux for Johann Gottfried Bremser - XIX tabulae : Anatomiam entozoorum illustrantes, congestae, nec non explicatione praeditae. Licensed under Public Domain via Wikimedia Commons / Via commons.wikimedia.org

20. Giant roundworm (Ascaris lumbricoides)

"Ascaris lumbricoides adult worms" by SuSanA Secretariat. Licensed under CC BY http://2.0 via Wikimedia Commons / Via Flickr: gtzecosan

Another soil-transmitted helminth which can grow up to 35cm long in the human gut. It's incredibly common, with an estimated 2 billion sufferers worldwide.

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21. Hookworms (e.g. Ancylostoma duodenale, Necator americanus and Strongyloides stercoralis)

"Hookworms". Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #http://5205.Note: Not all PHIL images are public domain; be sure to check copyright status and credit authors and content http://prov / Via commons.wikimedia.org

More helminths, which usually have no symptoms but can cause intestinal problems and anaemia. As many as 740 million people are believed to be infected worldwide, mostly in the developing world.

23. Toxoplasma gondii

"Toxoplasma gondii". Licensed under CC BY http://2.5 via Wikimedia Commons / Via commons.wikimedia.org

A protozoan parasite which infects cats and rats, getting into the brain. In rats, it's been shown to alter their behaviour – and there is some evidence that it does the same to humans, making their reactions slower, and making them more neurotic. The US Centers for Disease Control estimate that more than one in five American citizens are infected.