A farming community accumulates serious injuries after the locals suddenly stop feeling pain.

Bob is revived from the coma and remembers little about what transpired in Roth's lab.

Wes comes in contact with a needle tainted by a genetically engineered strain of hepatitis C.

A contagious disease menaces a small town.

A city Councillor blames Muslim extremists for poisoning his daughter.

Cyclists are hospitalized as the result of a mysterious outbreak.

A pharmaceutical company is scrutinized concerning a deadly side effect.

Crows wage attacks on military airports, prompting an investigation.

Terrorists take over the lab and force the team to create materials for use in chemical-warfare munitions.

Parents of a sick child reach out to Mayko.

A young boy's murder probe links the victim to an extinct prehistoric cat.

Carlos finds an atrocity while investigating an outbreak in Moldova.

The issue of human cloning is confronted by David.