Scientists Work on Global Virus Attack Strategy By JEEJA PUROHIT    PUNE, India (AP) -- More than 300 scientists from around the world shared information on tracking and curbing the cross-border spread of viruses as they met in India for a three-day seminar ending Wednesday.    "Emerging infections have taken center stage, not only in public health management, but are intricately linked with the economic welfare of nations," said A.C...