Infested! Living with Parasites: Introduction (01:40)
This segment orients viewers to the topic of parasites and the human body's relationship with them.
In Nairobi, Kenya, Michael Mosley searches for one of nature's most successful parasites. The beef tapeworm can only grow into adulthood inside humans.
Tapeworm Growth Cycle (03:36)
Mosley obtains infected beef; he swallows three tapeworm cysts. Learn what will happen if the tapeworms survive; it can only grow in the human gut.
Specialized Mutations (02:00)
Horniman Museum expert Joanne Hatton discusses the fish tongue louse's parasitic lifestyle.
Head Louse (03:39)
Mosley visits a delousing salon and gets infected with lice. Learn about the louse's characteristics. Dr. James Logan studies the lice.
Pubic Louse (02:27)
Pubic lice are increasingly hard to find. Learn about the louse's characteristics. Dr. James Logan discusses the louse's connection with gorillas.
Body Lice (01:53)
This louse is highly adaptable to clothing. Its behavior is very different than the head louse despite their common characteristics; this hints at human evolution.
Parasites Shaped Human Instincts (03:17)
Mosley reveals parasites to passersby. Dr. Val Curtis believes we evolved the disgust response to prevent being infected with disease causing organisms; other humans are the most likely source.
Tapeworm Infection (02:33)
Mosley learns the approximate size of the tapeworm in his body. Tapeworms absorb already digested food; carbohydrates are good for them. Learn tapeworm characteristics.
This microscopic single-cell parasite causes malaria. Experts infect Mosley's blood with the parasite; time lapse photography reveals why it is so deadly.
Parasite Hosts (01:03)
New hosts are essential to parasite long-term survival. Research reveals that the malaria parasite sharpens a mosquito's sense of smell. Mosely's tapeworm is two weeks old.
Unaware of Infection (02:12)
A ten-week-old adult tapeworm is full of eggs. Tapeworms leave the human body via the rectum. Prof. Craig will examine feces to help refine a diagnostic test.
Parasite Benefits (03:46)
A reconstructive surgeon pioneers modern leech use. Leeches feed once a year; learn their feeding methods.
Worms and the Human Immune System (02:29)
After three weeks, the tapeworm inside Mosley is not causing problems. Helena Helmby explains why Mosley does not experience diarrhea or stomach upset.
Hygiene Hypothesis (01:37)
Some scientists believe that living worm-free gave rise to allergies.
Worms Treat Disease? (03:53)
Daniel Heyman describes living with Crohn's. He uses hookworms to suppress his immune system. Helmby believes scientists should look to purify the molecules worms produce.
Inside Mosley's Intestines (02:44)
Mosley shows no symptoms six weeks after swallowing tapeworm cysts. He swallows a miniature camera and captures a tapeworm on film.
Three Tapeworms (03:03)
Experts review the footage from inside Mosley's intestines. Mosley swallows medication to rid the tapeworm infection. He reflects on what he learned about parasites.
Credits: Michael Mosley: Infested! Living with Parasites (00:45)
Credits: Michael Mosley: Infested! Living with Parasites
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