Blacklight

The virus was created from project Blacklight, hence the name. It originated from the previous Redlight virus, which was an experiment made by Blackwatch in an attempt to create a bio-weapon. Blacklight became even more dangerous than Redlight however. In three years, Alex Mercer and his team managed to make the virus ten times better - increased infectivity and decreased lethality. Meaning, the virus would spread faster and live longer.

Blacklight is the virus that Alex stole a sample of and got infected with when he attempted to flee out of Manhattan.