Headcrab Zombie

The Zombies from Aperture Science are a xenoform, the result of involuntary-experimentation, performed on human test-subjects in-and-under Port Hope, Michigan; at the [https://half-life.fandom.com/wiki/Aperture_Science_Enrichment_Center Aperture Science Enrichment Center. ] The company is a decades-later business-entity(/subsidiary?) that developed from the company Aperture which was founded as a shower curtain manufacturer.

Culture
Their culture is:
 * aggressive
 * parasitic
 * patriarchal
 * night-lurking
 * insular
 * terriorial
 * utterly-subserviant to GLaDOS (Genetic Lifeform and Disk Operating System), Aperture Sciences' heavily-armed macro-computer; which runs involuntary-experimentation in 'Testing Tracks'.

They are known assilimators; visitors can be warned the zombies will attempt to eat them, on sight/alert; as with most biot-infections.

Disease Origins (case-specific)
The disease that causes the necrosis that arrives at the biot-infection initially infested via the Xen Dimensional Rift experiment; and experienced forced-covergance with Moon Dust, hybridizing the virus (in Aperture Science experiments; claimed to have been an Ebola, modified at Aperture).

The disease is synonymous with the Rage Virus.

Appearances

 * Half-Life: Day One