<unk><unk>  has a diverse epidemiology and demographics due to the vast number of viruses classified under<unk> es. The total number of<unk>  pulmonary syndrome (HPS) cases reported in the United States from 2004-2015 is 323. HPS cases have been reported in 30 states, including most of the western half of the country and some eastern states as well. Over half of the confirmed cases have been reported from areas outside the Four Corners area. The mean age of confirmed HPS cases is 38 years (range: 5 to 84 years).
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