The original DayZ mod for Arma 2 was released, pioneering the survival zombie MMO genre.
Bohemia Interactive announced development of a standalone version of DayZ, distinct from the Arma 2 mod.
DayZ standalone entered alpha testing phase, available on Steam Early Access.
Introduction of new features and content expanding gameplay during early access period.
DayZ standalone version was officially released after early access development.
Bohemia Interactive announced transitioning DayZ to the Enfusion engine for improved graphics and performance.
Government and military collapse as infection spreads, lawlessness and anarchy take over the region.
Military forces attempt to quarantine infected zones and protect remaining uninfected civilians, but fail to contain outbreak.
Small groups of survivors start forming settlements, scavenging for supplies and defending against infected and hostile humans.
Various hostile factions and bandit groups emerge, competing for resources and territory across Chernarus.
The Red Cross virus mutates causing more aggressive behavior in infected, worsening survival conditions.
Limited international military and humanitarian aid operations arrive but are mostly unsuccessful due to infection spread and insurgency.
Survivors develop better strategies and techniques for scavenging and self-defense, improving survival rates slightly.
Violent clashes between survivor factions intensify, further destabilizing the region.
Ongoing survival struggles with infected threats, mistrust among survivors, and harsh environmental conditions dominate Chernarus.
