David and Jill make a trip to Colorado where a rampant SARS-like outbreak is occurring. David is in shock when he discovers that the outbreak is Spanish Flu, the virus he dug up in Nunavut. Racked with guilt, he walks into the path of a car and is se... (more)nt to hospital in a coma before he tells anybody his fears. Mayko Tran heads to Colorado to try to find Patient Zero.