After a woman suffers having cysts surgically removed from her right breast, things get even worse when surgical sponges are accidentally left inside of her.

A dream vacation to South America becomes a nightmare when a man's face begins to be eaten away by a parasite.

Tara keeps feeling stabbing pains in her scalp, so she investigates the Internet for answers. What she finds is almost unbelievable - botflies. She decides to cut open her scalp.

Boil-like legions lead to a diagnosis of lung cancer, just in time for Christmas. But during surgery, doctors are surprised to find a different sort of infection.

Found in contaminated food and water, Entamoeba histolytica is a parasite that feeds on living cells in the human gut.

After eating some raw sushi, a woman begins a fight for her life as a mass containing parasitic worms creates a blockage in her colon. The woman has Anisakiasis, a disease caused by Anisakis worms.

A disease begins eating a boy's face from the inside, forcing doctors to begin removing the infected flesh to save his life.

A happily married couple's trip to New York becomes a nightmare when they learn that they have been infected with the Bubonic Plague, not only putting their lives in danger but anyone who comes into contact with them.

Leishmaniasis kills skin cells in mass numbers, causing prominent skin sores. In extreme cases, it attacks the face itself, leaving the victim disfigured.

The Leishmania parsite feeds directly on the vital organs from the inside-out. It's spread through infected sand flies.

Acanthamoeba is a voracious parasite that enters the body through the skin or the nose, then devours brain cells.

While swimming with a friend a man has a seizure and collapses. Shortly after, he finds out that a pork tapeworm has been slowly eating away at his brain!

Even dead, the larvae of parasitic roundworms can cause river blindness, or Onchocerciasis. These parasites are transmitted through the saliva of blackflies.

Burrowing through the skin and internal organs, gnathostoma worms can eventually cause paralysis and death.

The pork tapeworm is a particularly vicious parasite because it can end up in the most important organ in the human body: the brain.

A fitness fanatic cannot understand why he is too fatigued to work out until he learns an infection in his colon has created a tear, causing e-coli to spread through his body.

A software programmer is admitted to a hospital and begins to show a strange symptom... speaking only in computer code! His wife fears he has gone insane when doctors discover that he has the most dangerous parasite in the world!

Boil-like legions lead to a diagnosis of lung cancer, just in time for Christmas. But during surgery, doctors are surprised to find a different sort of infection.

After being born several weeks premature, baby Lillian's development takes a dangerous turn when she begins to suffer from seizures.

A college student gets an oozing rash that grows rapidly! He thinks it is a staph infection but when it grows to cover most of his arm, he knows something worse is going on!

When medicine fails to stop the Cytomegalovirus inside baby Lillian's brain, her parents are forced to make an agonizing decision that could mean life or death for their daugther.

Tara keeps feeling stabbing pains in her scalp, so she investigates the Internet for answers. What she finds is almost unbelievable - botflies. She decides to cut open her scalp.

A seemingly harmless cat scratch leads to a rash that feels "alive"! A dermatologist confirms that the rash is really a case of hookworm and if it isn't stopped soon, it could turn deadly!

A trip through South America takes a deadly detour when Adam develops a wound on the side of his face. See how an insect bite developed into Leishmaniasis.

After suffering from seizures, Dawn discovers she has a pork tapeworm in her brain. To make matters worse, the only way to remove it will be to undergo brain surgery while AWAKE.

What started as a strained back turned into something more sinister for Jeremiah. Take a closer look at the symptoms of rat bite fever.

Holistic doctor Tom has been reluctant to see an ER physician about his growing rash. It isn't until he wakes up to a horrifying discovery that his girlfriend, Dee, forces him to take action.

After it is discovered that 8-year-old Jade has a toxocara parasite living behind her eyeball, doctors are forced to perform risky surgery.

When a fifteen-year-old girl develops symptoms of mood swings, headaches, fainting and seizures, her doctors must rush to find the cause. However, it's only after she passes that the true source of the infection is found.

After increasingly worse symptoms with her vision, this patient discovers there’s something in her eye and it’s not dirt.

Suffering from flu-like symptoms, a pregnant woman rushes to the hospital for treatment. After battling a secondary lung infection, she awakens from a coma & meets her 2-month-old son who was born prematurely to save both their lives.

Bizarre white growths in this man’s hand end up being barnacles! But how did they get there?