90 Days to Infect Entire U.S.

A new computer model reveals how a pandemic like the avian flu might spread quickly across the United States and what methods would best thwart the scenario.

Researchers assumed a starting point of 10 highly infectious influenza cases in Los Angeles, then let the model take it from there. The virus spread quickly, peaking in just 90 days with 100 or more infections per 1,000 residents of just about every corner of the country