They are the main antagonists in the 2015 indie game "Survivalist". They are created when a synthesized virus infects and turns a healthy human. There are 6 variations of this kind of zombie in the video game: the green strain zombies (Green eyes, Weakest, takes 7 days to turn), the blue strain zombies (blue eyes, Weak, takes 1 day to turn), the red strain zombies (Red eyes, hard to kill, takes minutes to turn) the white strain zombies (White eyes, very hard to kill, character incurable once bitten, takes about 5 seconds to turn), and finally the invisible strain zombies. (Eye color may vary, infected individuals can pretend to be human then secretly kill people and spread infection, character incurable once bitten, takes about 5 seconds to turn)
It is not clearly shown if they are actual zombies or just another type of Infected. Characters in the game call the creatures both "The Infected" and "Zombies", and it does not require a headshot to take them down. On the other hand characters who had died by blood loss, hunger, thirst, or extreme fatigue will still reanimate if they contacted any strain of the infection before death. Survivors can be saved by antigens if the strain they got infected by is curable, and they haven't turned yet.
When an individual is infected, the incubation period can vary depending on what strain they contacted, ranging from seconds to days. At first no visible symptoms are shown, but as the virus attacks the body the victim starts to feel sick and wants to vomit. (Shown by the character Tom Catt when you ask him how he feels after being infected for a while) At the late stages of the infection the victim's skin starts discoloring and they die. The virus then floods the brain with chemicals causing aggression and hunger, leaving only the brain stem active. The virus may also make the zombified victim stronger and tougher.
The game also states that the virus was airborne, which allowed it to infect most of the world quickly. It's unknown if this is still the case as the virus started developing new strains.