These killers lie dormant, waiting for the right time to strike. Eleven-month-old Garrett Richardson...

Across the United States, doctors and scientists are fighting a war against some of nature's deadlie...

Perfecting the art of reproduction have made parasites the most successful life form on the planet....

Parasites are ruthless, single-minded and above all devious. To become the most prolific life forms...

Nature is a war zone and parasites are the ultimate fighters. They are hungry, they are ruthless and...

In Virginia a young woman is attacked by an invincible brain-eating monster that threatens to take h...

A fit and active dance instructor is suddenly stopped in her tracks by unbearable abdominal pain and...

A schoolteacher deals with an amoeba that eats at his liver and causes him high fever, abdominal pai...

A nine-year-old hockey player comes down with encephalitis from the Acanthamoeba, which causes him t...

The Crytosporidium parasite infects a little girl, causing her severe vomiting and diarrhea. A micro...

A cat scratch leads to a horrifying result for a veterinary volunteer; strange liquid oozes from a c...

Stories of parasites that reside inside their traveling hosts; an Iraq war veteran pulls a foot-long...

Daily stomach cramps reveal some of the most common parasites in nature.

A man tries hookworms to cure his allergies; a bloodsuckers gets into a writer's nose.

A middle-aged man who has been caring for his ailing mother gets Babesiosis from walking barefoot to...

A seven-year-old girl suffers from seizures from a pork tapeworm after being adopted at the age of t...

A toddler starts worrying her parents when she loses her appetite for the foods she normally eats, b...

A teenage boy starts complaining of nasal pain and fever after a swim in the lake. It eventually tur...

A man suddenly grows a pimple that seems minor at first, but eventually oozes and makes his face swo...

A fairly young part-time student starts feeling a throbbing headache, which causes her to have the f...

A teenage girl has been enjoying her life of gymnastics and nature, when she suddenly receives a scr...

A middle school teacher has been having a healthy pregnancy until suddenly, she starts experiencing...

A young mother expecting her second child suddenly comes down with a stuffy nose and itchy throat. T...

A 1-year old boy who survived a premature birth starts resisting food, suffering a fever, and coughi...

A little girl's health begins to deteriorate when she suddenly comes down with a fever. She then dev...

A young aspiring artist suddenly comes down with flu-like symptoms and a swollen face. To make matte...

A 7-year-old girl contracts the bubonic plague and suffers a 107 fever, vomiting, painful buboes, an...

A teenage ballerina suffers from painful migraines and muscle failures; a young missionary's skin cr...

A newly engaged Illinois man mysteriously collapses and suffers organ failure and gangrene from Legi...

A mother suffers with abdominal pain and nausea for four years until the true cause of her condition...

A small-town boy's summer fun is cut short by a life-threatening Neisseria meningitidis infection. A...

A Peace Corps volunteer traveling to Burkina Faso suddenly suffers from excruciating bouts of nausea...

A teenager caught in the 2011 Joplin tornado in Missouri is recovering in the hospital when he sudde...

A teenage boy develops stomach pains, starts vomiting blood and fecal matter, and has nausea from ac...

A special episode with three cases that happened during the holidays – A newlywed woman gets a const...

A newborn baby develops hydrocephalus from a parasitic disease called toxoplasmosis, which was contr...

A teenage girl begins having strange mood swings from anti-NMDA receptor encephalitis; an elderly mo...

A 6-year-old boy suffers a nasty cough, fever, and vomiting from valley fever; a newlywed husband be...

A 23-year-old athlete/construction worker suffers multiple grand mal seizures and high fevers from e...

A contractor gets hit in the head with a tool, and later starts getting a pounding headache, dizzine...

A Canadian science-lover and traveler suffers a painful lesion caused by botfly larvae; a video game...

A war veteran suffers fatigue, high fevers, night sweats, strange rashes, bloody urine and jaundice...

The second episode of the series to be Christmas-themed – a saleswoman gets a stabbing headaches and...

A teenager gets coughing, shoulder pains, dizziness, and nausea from Cryptococcus gattii fungi invad...

A Canadian 13-month-old toddler gets breathing difficulties and mild vomiting from accidentally swal...

A 29-year-old man gets tooth pain and almost dies of necrotizing fasciitis caused by the bacteria St...

A 4-year-old boy literally drowns in his own mucus, being a victim of an outbreak of the Enterovirus...

An athlete gets headaches, stomach pains, breathing difficulties, and a liver mass from Entamoeba hi...

During a fishing vacation, a soccer coach goes into septic shock from Vibrio vulnificus necrotizing...

A newlywed woman gets extreme headaches, memory problems, sinus pressure, and painful rashes, while...

An 11-month-old boy experiences wheezing and vomiting after swallowing a button battery; a landscape...

A 2-year-old girl experiences severe pain, trouble breathing, and vomiting from a bark scorpion stin...

A young college student contracts Acanthamoeba keratitis from sleeping in her contact lenses; an inf...

A California teenager nearly suffocates from hantavirus pulmonary syndrome; a Hawaiian personal trai...

A 13-year-old boy gets a cut on his leg that nearly leads to amputation when it becomes infected wit...

The third episode of the series to be Christmas-themed – A baby is having problems controlling the l...

This episode looks back at three cases from past episodes: a teenage boy with a grill bristle in his...

A infant becomes totally paralyzed after accidental exposure to botulinum toxin; a Texas man develop...

An Idaho 17-year-old football player is struck with a sore throat, breathing difficulties/lung pain,...

During a family vacation cruise, a Louisiana 2-year-old is restless and drools, which leads to vomit...

A Canadian woman suffers a piercing pain in her throat and vomiting from accidentally swallowing a g...

A four-year-old Pennsylvania boy gets a runny nose with red discharge, stomach pains, pale skin and...

The show's fourth Christmas-themed episode, and the second episode of the series that looks back at...

A young girl is brought to the hospital with stabbing pains in her scalp; a mother's mysterious symp...

A man falls comatose; a college student has a sore throat; and a young woman's symptoms confound exp...

A man has something living in his eye; a young girl mysteriously falls ill; and a woman's bizarre sy...

An infant falls mysteriously ill; a biology professor becomes an unexpected host; and a family man i...

A new mother is in critical condition; a young boy has an ailment that no antibiotics can cure; and...

A young boy has a strange condition; a woman's symptoms push her to madness; and a toddler falls int...

A teenager develops mysterious blotchy sores; an athlete is hit by a rare infection; and a woman bat...

A man coughs up blood; a newlywed husband is struck down by a rare disease; and a father struggles w...

An infant is suddenly paralyzed; a father is infected with a monster that threatens to blind him; an...

A woman is struck down by a dangerous parasite; an infant falls mysterious ill; and a fungus brings...

After a man hits his head, he's left fighting a one-on-a-million medical mystery; a boy's wounded kn...

A man develops a strange growth on his wrist; a nurse finds twig-like pieces in her urine; and a pre...

Christmas time is here, and these three victims each receive a monstrous gift. In Florida, a woman i...