"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 Effect Related monster
Cost Affected cards
Crush Card 1 DARK monster with 1000 or less ATK Monsters with 1500 or more ATK Lilith, Lady of Lament & Lich Lord, King of the Underworld
Cannon Any Number of monsters 1 Spell Card in their Deck for each Tribute Monster. N/A
Current Corruption 1 DARK monster with 0 DEF Monsters with 2000 or less DEF N/A
Deck Devastation 1 DARK monster with 2000 or more ATK Monsters with 1500 or less ATK Diabolos, King of the Abyss & Lilith, Lady of Lament
Eradicator Epidemic 1 DARK monster with 2500 or more ATK Spell or Trap Cards Prometheus, King of the Shadows
Full Force 1 DARK monster with 2000 or more DEF Monsters with 1500 or less DEF Duke Shade, the Sinister Shadow Lord
Grinning Grave 1 DARK monster with 3000 or less ATK 1 Card in the opponent's Deck for every 500 ATK, and any monsters they draw for 3 turns after resolution with 2000 ATK or More Ahrima, King of Wickedness
Last Machine Acid 1 WATER monster Machine monsters Acid Slime
Planet Pollutant 1 "Alien" monster Face-up monsters without an A-Counter N/A
Root Ransom 1 DARK monster with 0 ATK Link Monsters N/A
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