Infected are one the zombies that can run to their prey. Their attacks are deadly enough, but fighting them in groups can increase the odds in their favor, taking you down almost instantly.
They can attack by swinging their arms and grabbing you.
Their danger level is low to high.
The games they're in:
Dying Effect 2: Liara's Indoctrination
Dying Effect 3: The Marked Ones
Dying Effect 4: The Quarian Warfare
Dying Effect 5: Reborn
Dying Effect 6: Dawn of the Purge
Dying Effect: Redemption (Comic Book)
Dying Effect: Wrath of Liara (Comic Book)
Dying Effect: Paragon Lost (TV Series)