Testing also was conducted to evaluate whether the persistent seronegativity was attributable to infection with an atypical virus or to lack of immune competence.
测试也进行了评估是否持续抗体所致感染非典型病毒或缺乏免疫能力。
Testing also was conducted to evaluate whether the persistent seronegativity was attributable to infection with an atypical virus or to lack of immune competence.
测试也进行了评估是否持续抗体所致感染非典型病毒或缺乏免疫能力。
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