usually refractory to treatment
The human neurotropic JC virus (JCV) is responsible for progressive multifocal leukoencephalopathy (PML), an infectious demyelinating brain disease with major morbidity and mortality, usually refractory to treatment.
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usually refractory to treatment
通常难以治疗
以上为机器翻译结果，长、整句建议使用 人工翻译 。