Background seropositivity rates for specific antibodies to Jamestown Canyon Virus (JCV) can exceed 25 % in certain geographic areas in the United States. This can potentially lead to diagnostic confusion, as apparently illustrated by a patient from New Jersey with Powassan virus encephalitis, who also tested positive for antibodies to JCV.

中文翻译：

---

詹姆斯敦峡谷病毒背景血清阳性可能导致诊断混乱

在美国某些地理区域，詹姆斯敦峡谷病毒 (JCV) 特异性抗体的背景血清阳性率可能超过 25%。这可能会导致诊断混乱，正如一名来自新泽西州的波瓦桑病毒脑炎患者所表明的那样，该患者的 JCV 抗体检测也呈阳性。