Patient 29's File is an artefact that can be found in Season 1 Mission 14: Patient 29.
Runner Five retrieves this file from the Keeley Centre.
Description[]
So this is the mysterious Patient Zero, the man who might have been the first ever infected with the zombie virus. His details don’t anything out of the ordinary at first glance: Arthur Gurkhan, 46 years old, married, worked as a lab technician, no known allergies or diseases apart from a varicose vein and flat feet.