Shamblers are an alternate fourth stage of the Infected. It is suggested that Shamblers were in the process of mutating into Bloaters, but heavy exposure to water from the constant rain in Seattle caused them to change into Shamblers instead. However, they are encountered in areas away from water such as in the suburbs of the city and the forest areas. They are horrifying, walking pustule-clusters that spray gaseous acid when they get near anyone and take massive damage before dying. The fungal growth is so immense that spores cover their entire body, leading to oversized heads and torsos with dozens of the puss spores around them. In addition to this, their mouths have been stuck gaping wide by the fungus, preventing them from being able to bite. However, the growth has not consumed their arms and their eyes are still partially visible. Once defeated, these festering threats explode with violent force, emitting enough spores that deal heavy damage those surrounding them.