Or, hammered by overuse, the Internet could shut down within two to four days of an outbreak, eliminating telecommuting as a viable option.

Disturbingly, that was one finding of a simulation, or war game, held in January in Davos, Switzerland, by the World Economic Forum and management consulting firm Booz Allen Hamilton Inc. More than 30 senior industry and governmental executives played out the arrival of the flu in Germany from Eastern Europe -- and the results weren't pretty.

"We assumed total absentees of 30 percent to 60 percent trying to work from home, which would have overwhelmed the Internet," said participant Bill Thoet, vice president of Booz Allen Hamilton. "We did not assume that the backbone would be gone, but that the edge of the network, where everyone was trying to access their office from home, would be overwhelmed. The absence of maintenance was also a factor. The person who brought up the problem was himself a CEO of an Internet service provider.

"The conclusion [of imminent collapse] was not absolute, and the situation was not digitally simulated, but the idea of everyone working from home appears untenable," Thoet said.

On this side of the Atlantic, predictions about how the Internet would fare in the face of a pandemic are less dire.