Physician: If you have a fever and cough or a sore throat, stay home. Man on TV: I'd say 95% chance of this is manufactured. Came out of a laboratory. Female Reporter: The source of the virus was traced back to drug test done at Gen-Sys Laboratories in San Francisco. Male Reporter 1: The lab technician, now known as Patient Zero, was accidentally exposed to retrovirus ALZ-113, an Alzheimer's trial drug that was being testing on chimpanzees. Male Reporter 2: The infected chimps showed signs of erratic and aggressive behavior that led to their escape from the facility.