Diagnosis: Unknown

A classic case of Munchausen syndrome by proxy, nurse Genene Jones kills at least 47 patients with the muscle relaxant succinylcholine while working at Bexar Medical Center in Texas.

Nine hundred children are sent home from school and thousands are inoculated during an outbreak in Massachusetts that depletes local supplies of antibiotics and lands four middle school students in the hospital.

A nurse from Kentucky comes under scrutiny when hospital officials notice a high number of deaths during his work shifts. In fact, death seems to follow Donald Harvey from job to job, beginning in 1970 and ending with his arrest in 1987.

Dr. Harold "Fred" Shipman is known as a doctor trusted by his patients and his colleagues. For 25 years, nobody suspects that the town doctor is amassing a death toll that makes him one of history's most prolific serial killers.

Reverend Dwight Moore is at death's door when he is transferred from his local hospital to Memorial Hospital in Chapel Hill. With all the expertise and technology of modern medicine at their disposal, doctors are still unable to find the cause.

In an exclusive Kansas City suburb, cardiologist Mike Farrar is suddenly stricken with a powerful and mysterious stomach illness. The violent and terrifying symptoms are relentless, leaving the man fighting for his life.

Robert Curley is newly married and is renovating an old home for himself and his wife, Joann. He is also an electrician doing repair work in a local chemistry lab. Within weeks of starting the new projects, he becomes violently ill.

Middle school teacher Donna Boley is overcome with nausea and a tingling feeling in her extremities. The principal finds Donna crawling up the stairs on her hands and knees.

When two young children in Idaho are diagnosed with food poisoning, doctors have no idea that within days the situation will get out of control, as two hundred thousand people fall ill in the country's largest case of single-source food poisoning.