created from a virus found in a rare African flower, known as "Stairway to the Sun", which has grown underground.
- most notable infectees icnlude Lisa Trevor.
known as the Tyrant virus. The most commonly encountered virus found in most of the game series.
created from infecting Leeches with the Progenitor virtus.
- created by William Birkin.
- drastic mutation and constantly changing form.
created from merging the T-virus with an underwater virus found in deep sea fish.