以下为句子列表：
英文: Following the initial test at the time of the exposure, the exposed employee who is found to be seronegative should be retested 6 weeks, 12 weeks, and 6 months after exposure to determine whether transmission has occurred.
中文: 建议：暴露后第一次测试发现血清反应阴性的暴露员工应在暴露后的第六个星期，第十二个星期和第六个月重新测试，以确定是否发生传染。
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