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Based on this official leak

Ever since these two were born both were assigned and trained at the military base before everything went to shit. Their first encounter with an infected was a wounded tubby that they encountered and brought in to help them back to health and get information on what happened to them, at this time the infection has not been established or well known and before they knew it in a few hours the stranger had gone rabid and started attacking doctors and nurse who were giving aid until finally the rabid stranger was shot down by Mara herself which she wasn’t really happy about. When commotion died down they that the nightmare were over until people in the military base we’re having the same symptoms as the rabid stranger. it was like this insatiable hunger came over the tubbies who were infected which lead a complete collapse and abandonment of the military base. Now these two are currently living in a safe zone that they were send to by the organization to help survivors and carry out tasks around the safe zone. They both suffer guilt blaming themselves for causing the down fall of the downfall of the base even though they both were non-wiser.