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ST. LOUIS – Hundreds of Americans in eight cities are lining up for experimental swine flu shots in a race to get a vaccine out in case the new flu virus regains strength this fall and winter. Sharon Frey, who is leading the government-funded testing at Saint Louis University, said scientists have been working late nights and weekends to organize the studies and recruit volunteers. “Typically it takes a year to do this,” said Frey, an infectious diseases expert.