CDC researchers have determined that 624 cases of hantavirus pulmonary syndrome have occurred in 34 states since the start of monitoring in 1993. Thirty-one of the cases, identified retrospectively, occurred before then. The Sin Nombre virus, which developed in deer mice, caused 612 infections. The remaining 12 were caused by other hantaviruses that, along with the Sin Nombre pathogen, are endemic to North America. The report also noted some milder cases of infection with the zoonotic disease. Researchers said infections that don't involve the clinical presentation of hantavirus pulmonary syndrome aren't reported, meaning scientists probably do not understand the full range of disease presentation.
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