Season 5 - Episode Guide

Teenage girl in Tennessee has life-threatening inflammation of the brain; matriarch of a large Louisiana family hosts flesh eating infection; reality TV competitor in California returns from Fiji with creature attacking vital organs from the inside.

When three unsuspecting young families are thrown into a tailspin, they are shocked to learn of the tiny culprits wreaking havoc on their lives. First, a married couple in California watch helplessly as their son struggles for every last breath.

A Massachusetts EMT is shattered by a routine emergency call when she discovers that the victim is her son. A self-described tough guy in New Jersey is reduced to tears when something sinister starts to rip apart his intestines.

Illinois contractor who suffers bump on his head finds himself fighting for his life in the ICU; college football player is in agony from life threatening blinding headaches; mystery illness threatens life of boy 48 hours after beach day.

The lives of three young people are suddenly turned upside down. In South Dakota, what begins as a common sore throat quickly spirals out of control for a fifteen year old girl, as a rare and dangerous affliction leaves her clinging to life.

A war veteran, a PhD scientist, and a newborn, all clinging to life by a string. In Tennessee, new parents are horrified when a deadly infection pushes their baby daughter to the brink of death.

Christmas time is here, and these three victims each receive a monstrous gift. In Florida, a woman is out Christmas shopping when she suddenly feels a stabbing pain in her eye so severe that she believes she sees shadows of worms in her eye.

Trouble is lurking in the bodies of three different women. In rural Washington State, a teenager's shoulder pain leads to her being quarantined in a matter of days. If doctors can't determine what's attacking her, she'll die.

Toddler struggles to breathe in Saskatchewan but gets worse in the ER; Virginia teen's seizures and sudden blindness leads to a horrific discovery in her brain; six-year old with rash and high fever ends up in the ER.

Three healthy people with a love of the outdoors are struck down by a deadly menace that lurks inside them. In Ohio, a young boy wastes away in front of his parents' eyes as a mysterious infection overtakes his body.