Common Infected

Lore & Background

Despite their lack of individual threat, Common Infected possess a terrifying hive-like instinct regarding audio cues. A single gunshot or shouted warning can draw dozens from the surrounding darkness, converging on the noise source with singular focus. This behavior forces Survivors to move in silence and rely on flashlights not just for vision, but as tactical distractions. They are the fuel for the Special Infected's ambush tactics; a Smoker will drag a survivor into a crowd of Commoners, or a Hunter will leap from their midst, knowing the swarm will prevent an easy escape.

Reader's Guide

The Common Infected have no hierarchy or complex motivations; they are biological machines designed to spread the virus through consumption and sheer volume. Their primary drive is an uncontrollable urge to bite and tear flesh, triggered by movement, sound, and light sources. In the ecosystem of the outbreak, they act as the environment itself—a living hazard that fills every empty space. Their interaction with Survivors is defined by attrition.

Individually, a Common Infected can be dispatched with a single shot or melee strike, but their ability to spawn in infinite numbers makes them deadly. They force players to manage ammunition carefully and maintain constant movement. If a Survivor lingers too long, the horde will overwhelm them through weight of numbers alone. Their impact on the world state is absolute; they have reclaimed civilization.

Cities are no longer places of life but of death, teeming with millions of these shambling figures. They serve as the bridge between safety and doom, ensuring that no path is ever truly clear and that every journey is a desperate race against an endless enemy.

Did You Know?

• The Common Infected are humans who have contracted a mutated strain of an infection, though neither the source nor nature of this 'Green Flu' are made clear in the games.
• Damage to the Infected in Left 4 Dead 2 is portrayed more realistically, with bullets and melee weapons ripping off bits of flesh and, in some cases, limbs.
• Uncommon Infected unique to each campaign possess abilities that separate them from Common Infected, such as CEDA hazmat suit Infected being fireproof and riot gear Infected being bulletproof from the front.
• The flashlight has infinite battery life, but using it enables players to see in the dark with the downside of gaining the attention of the Infected much faster.
• A pipe bomb attracts any nearby Infected to the flashing light and sound it makes until it explodes.