Swine Flu Spreading

It's known that swine flu is a fairly highly contagious disease. What's been less clear is just how quickly the H1N1 virus gets transmitted in homes and schools _ and how effective vaccines would be in containing a widespread outbreak. For the first time, researchers at the Fred Hutchison Cancer Research Center and the University of Washington are filling in some of the details about the virus, whose return to the northern hemisphere has already touched off anxiety in some quarters.

Kyung M. Song

September 23, 2009