In less than a year since H7N9 influenza was first seen in humans, confirmed cases have reached 300, and more are occurring every day. The rate is far more worrisome than that of H5N1, which took five years to hit 300 cases, according to Michael T. Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota. H7N9 doesn't cause disease in poultry, the likely source of human infection, and fecal tests may be negative, so monitoring and preventing the disease in poultry is challenging.

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