"Virus" (ウイルス Uirusu or ウィルス Wirusu) is a series of Trap Cards used by Seto Kaiba in the Yu-Gi-Oh! anime and manga, as well as by Clarissa Turner in Yu-Gi-Oh! VRAINS. It was introduced in Premium Pack 5, with the second member being released in Flaming Eternity.

The later members are spun off the original card, "Crush Card Virus". "Crush Card Virus" is a Virus Card in the manga. Somewhat ironically, "Crush Card Virus" no longer has the Lingering Effect of other "Virus" cards in the TCG/OCG due to receiving a major errata so that it did not need to be Forbidden. However, the monster counterpart of "Crush Card Virus", "Doom Virus Dragon", has the same effect that it did prior to its errata.


All members of the series have the following properties in common:


Virus Cost Affected cards
Crush Card 1 DARK monster with 1000 or less ATK Monsters with 1500 or more ATK
Current Corruption 1 DARK monster with 0 DEF Monsters with 2000 or less DEF
Deck Devastation 1 DARK monster with 2000 or more ATK Monsters with 1500 or less ATK
Eradicator Epidemic 1 DARK monster with 2500 or more ATK Spell or Trap Cards
Full Force 1 DARK monster with 2000 or more DEF Monsters with 1500 or less DEF
Grinning Grave 1 DARK monster with 3000 or less ATK Cards in the opponent's hand/Deck, and any monsters they draw for 3 turns after resolution
Last Machine Acid 1 WATER monster Machine monsters
Planet Pollutant 1 "Alien" monster Face-up monsters without an A-Counter
Root Ransom 1 DARK monster with 0 ATK Link Monsters