Infected

The infected are all those who have come into contact with the WhiteKnight disease spread by Cal Walker. They attack any humans they come across, and usually take several shots to kill unless hit in the head.

In-game
They are very agressive, and will attempt to tear Nate apart as well as any other humans they see. They appear to be a mixture of infected Vietnamese soldiers and American G.Is, although there are also a few civilian male and female looking ones. They do not carry any weapons, and can only utilize melee attacks, vomit up infected blood or punch. If wounded they will make a desperate rush at Nate in an attempt to kill him. Headshots will always kill them instantly and melee attacks will down them in several hits, as opposed to less effective body or limb shots.

Trivia

 * During the levels Refuge, Evac, and Whiteknight, Nate will encounter a specific type of Infected wearing a hood and wielding dual machetes. These enemies function as 'bosses' during the three missions and pose a great danger to Nate as their attacks can inflict severe damage. They're almost impervious to gunfire.