What am i, and what are you thinking of?!

Question: What am i, and what are you thinking of!?

you can't see me but you can catch me,
you cannot hold me, not by both hands!.
i float and i attack

any ideas!?Www@Enter-QA@Com

Answers:

A virus!.Www@Enter-QA@Com

BreathWww@Enter-QA@Com

A bug and it′s nice not to have one!.Www@Enter-QA@Com

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