When the E-virus is injected into a human they gain extra brain cells and other organs are healed. If the virus isn't injected daily someone will turn into the Tyrant. But if they are injected with an unpure dose of the E-virus, they will become an E zombie. If further mutated they are even nastier.
The E zombies have been infected by the E-virus and are faster and stronger then T-virus-infected humans. They also have extended finger bones which appear to be claws and can be used as weapons. These zombies are capable of jumping high and far.
E zombies appeared in Jacob Graeff's fanon animation 2.