Players will occasionally come across Common Infected wearing a Hazmat Suit, which was likely being worn prior to the person being infected.The Hazmat-suited Infected appear exclusively in the Left 4 Dead 2 campaign, The Parish. Though not as numerous as normal Common Infected, they share the same health, abilities and weaknesses. However, due to their Hazmat Suits, they are immune to fire in all forms.
The Mud Men will appear in the campaign Swamp Fever. They are similar to the Common Infected in most ways, except that they are covered in mud and use this as camouflage. They sprint on all fours. However, if it is shoved, it will go back on to two feet, the same way the Hunter does. They also run even faster than regular Infected. This makes them particularly harder and annoying to kill, especially when traversing through water as they can run below water as their own ground, while Survivors are slowed when inside the water. When a Mud Man hits you, your screen is partially covered in little mud; the more it hits you, more mud covers your screen. The reason why they walk on all fours could be that it's hard to get around in the mud using just their legs, so to help them traverse, they adapted by using all four limbs to move.Or it could be an infected half way turned into a Hunter.
Chet Faliszek stated in an e-mail that "The Parish" would gain another Uncommon Infected; the Riot Infected. While human, they were members of a private security firm, which was hired by CEDA to protect civilians. In laymen terms: they were "Rent-A-Riot-Cops". However they were Infected while wearing their gear, and the Kevlar gives them immunity to bullets. Chet has stated however, that they will not be immune to fire, melee weapons, or explosives.
Clown Infected. A once laughable, lovable comedian, now a victim of the spreading infection. They wander around the Dark Carnival campaign and when they spot Survivors they'll charge calling other Infected in with the sound of their noisy squeaky shoes for an attack, something very similar to the idea of the Screamer.Left 4 Dead Wiki
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