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Hantavirus - which is fatal in 36 percent of cases - typically causes about 30 cases per year in the US, mostly in western and southwestern areas. But some states are now recording a surge in the disease. In infection hotspot Arizona , officials have issued a warning after recording seven cases and three deaths this year - compared to 11 cases in the six years from 2016 to 2022. There have also been two cases and one death in California , including in a county that hasn't detected the virus for two decades.