egan and Tommy are investigating the murder of a girl who was literally torn apart. They think someone on drugs. Tommy finds the man and he attacks him, biting Tommy. Megan looks at the man and thinks the man might have rabies. But when they examine him there appear to be no signs that he was bitten which is how rabies is passed. And when another person who appears to be also infected is also brought in, they wonder if the virus mutated to a strain that can be passed like the flu. But Megan learns that both men recently had some kind of transplant performed on them. So she thinks the tissue they got was infected. They also later learn that someone is going around and killing young men who are of similar physical characteristics.

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