L-Virus

The L-Virus is a computer-bug-like virus created by Leviathan.

Symptoms
Notable symptoms of this virus include red eyes, and an aggressive attitude to anyone who doesn't have the virus. Other symptoms include darker skin tones on some Appmon, and the Appmon's body is surrounded by faint black mist.

The respective Appmon's App will also be affected in a crazy way.

Cure Process
After an infected Appmon loses against a non-infected Appmon in battle, a 3-second timer will countdown before the virus "poofs" out of the Appmon in the form of a white dust cloud. Once the cloud clears, the Appmon will appear non-infected before teleporting into an Applidrive, and turning into an Appmon Chip.

Many have described the cure as a sense of relaxation, and some have related it to something they enjoy.