As long as you are in the Battle Phase, then yes, you could use Trap Jammer against Crush Card Virus.
You can chain Spell Speed 2 or 3 effects to Dark Hole. Crush Card Virus is Spell Speed 2, so yes, you can chain it to Dark Hole's activation.
No, it doesn't destroy any of its controller's monsters, only the opponent's monsters. (It requires a monster to be tributed as a cost, but this is not 'destruction'.)
Yes, it is a virus that attacks bacterias.
A virus that attacks bacteria. -APEX Learning
Tribute 1 DARK monster with 1000 or less ATK. Check all monsters your opponent controls, your opponent's hand, and all cards they draw (until the end of your opponent's 3rd turn after this card's activation), and destroy all monsters with 1500 or more ATK.
the meaning of opponent is someone on the other team that you are virus
a virus that attacks tobacco leaves
HIV, human immunodeficiency virus, is the virus that attacks the cells in the immune system that produce antibodies.
No. A bacteriophage is a virus that attacks bacteria.
This type of virus is a bacteriophage. It attacks bacteria. The T4 bacteriophage attacks E. coli.
The cells of mucous membranes are open to virus attacks because they are not covered by a skin.
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