Is a Rogue Computer Virus Shutting Down Nuclear Plants Worldwide?

The Stuxnet computer virus used to attack Iranian Nuclear Power Plants may have gone rogue and could be shutting down nuclear power plants around the world.
It is now common knowledge that the U.S. and Israel developed the Stuxnet computer virus in order to slow down Iran’s nuclear program.

Has Stuxnet already caused damage outside of Iran?
Since the Japanese earthquake, Michael Rivero has posted hundreds of articles arguing that the Stuxnet virus has “gotten loose” and attacked other nuclear power plants outside of Japan.
The former editor of the Japan Times – Yoichi Shimatsu – writes:

Tepco engineers suggested that the electric power inside the plant was knocked out by something other than the tsunami. I have pointed to this possibility early on, that the quake and control disruptions could have made the control computers vulnerable to the Stuxnet virus.

According to Yomiuri, Stuxnet was in Japan as of October of 2010. However, I find it hard to believe that it was not the earthquake and the tsunami which knocked out the power, although I suppose a virus could have exacerbated the damage.    link