No. That Uncanny X-Men issue as well as the Dark Avengers issue 8 are both a part of the Utopia Tie-In story for the Dark Avengers story line. Issue 514 is number 4/6 comics that is included in this set of tie-ins.

The reading list is:

1. Dark Avengers/Uncanny X-Men #1

2. Uncanny X-Men #513

3. Dark Avengers #7

4. Uncanny X-men #514

5. Dark Avengers #8

6. Dark Avengers/Uncanny X-Men Exodus

There is no Dark Avengers virus. The Dark Avengers were villains recruited by H.A.M.M.E.R. Director Norman Osborn. These recruits assumed the identity of the heroes who refused to follow under Osborn's command.

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The New Avengers eventually are able to defeat the Dark Avengers pretty handily once they are able to take out The Sentry. After The Sentry was thrown into the sun, Norman Osborn took a beating from Steve Rogers and the rest of his team suffered defeats as well. Steve Rogers allows Bucky to remain Captain America, and instead takes on the new role of Director of Shield.

The Dark Avengers were a team of supervillains posing as heroes in the Marvel Comics universe, led by Norman Osborn in a post-Secret Invasion storyline. The team consisted of characters like Bullseye as Hawkeye, Venom as Spider-Man, and others taking on the identities of established heroes. This was part of a larger plan by Osborn to manipulate public perception and maintain power.