The unidentified Washington man was in his 30's and lived in Snohomish County, north of Seattle.
这名住在西雅图北部的史挪合米许郡的30岁华盛顿男子的死亡原因尚未得到证实。
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Gary Goldbaum, Snohomish Health District medical director, said medical officials had not been able to isolate any "risk factors" for the man to identify where he might have been exposed.