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.

Neuropsychiatrist Garrett finds himself in the hospital as a patient when a mysterious illness has caused his vital organs to start shutting down.

After finding out what’s wrong with her eye, Melanie is forced to administer medication that may cause more harm than good.

After years of severe stomach pains and other painful symptoms, Jackie discovers she's been suffering from Schistosomiasis, or snail fever.

Erica’s postpartum joy is short lived when she begins to suffer from mysterious pain not long after giving birth to her daughter.

Weeks after delivering her baby via caesarian section, Erica is shocked to discover the cause of her subsequent intestinal troubles.

When a teenager named Jordan begins to experience repiratory issues, his Mom races him to the hospital. Doctors diagnose him with a type of pneumonia … and both Jordan and his parents are forced to face the possibility of death.

A teenager named Jordan's contracted the deadly Hantavirus - a dangerous virus that can be contracted from infected mice.

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!

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

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.

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.

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!

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.

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.

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.