Cordilla virus

The Cordilla virus was an type 3 immuno-pulmonary virus that is similar to the Hantavirus. The incubation period of the virus was initially 14 hours but decreased significantly as a result of the weaponized variant added by Marcus Alvers. The symptoms of the virus were nose-bleeds, hemorrhaging, skin abscesses and eventually death.

Day 3
Invented by rogue Ukrainian scientists, the virus was codenamed Cordilla. The Cordilla virus was introduced during Day 3, when HAZMAT units found a body infected with it. Later, Jack Bauer went undercover to try and help Ramon and Hector Salazar buy it from Michael Amador. Nina Myers also tried to buy the virus from Amador, but he escaped, and sold it to Stephen Saunders.

Saunders worked in collabaration with Marcus Alvers to develop a weaponized variant, manufactured to have a shorter incubation period than the pure virus.

Marcus Alvers then released the virus into the Chandler Plaza Hotel, killing Gael Ortega and infecting most of the hotel guests and staff. Michelle Dessler went to the Hotel along with Dr. Sunny Macer and Nicole Duncan to detain the virus and keep it only in the building, and by treating the hotel guests as best they could, but Michelle was forced to shoot one irate man trying to escape, and thus risking exposing the virus to the public. Several guests managed to survive the attack, having been immune to the virus's effects.