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A new strain of the common intestinal bug called norovirus has been spreading misery across the country. The Centers for Disease Control and Prevention says the new virus, which popped up in Australia last spring, caused 19 percent of U.S. norovirus outbreaks in September — and nearly 60 percent of December’s outbreaks. The highly-contagious virus causes severe vomiting and diarrhea. Most people recover in a few days, but it can be very dangerous for some.