COMPUTER SCIENCE: Flushing Out Nasty Viruses in the Balkans.

Bulgaria created a pioneering center in late 1990 to tackle the threat that its homegrown computer viruses posed to the world; according to experts, it has been a major force in reining in that threat. Now the lab is struggling to stave off obsolescence on a budget of roughly half of what a single Western whiz kid fresh out of college might earn in a year.