但是12月23日的进一步检测—包括在北京中国疾病预防控制中心进行的聚合酶链反应试验—显示结果为阳性。
But further tests on 23 December - including PCR tests carried out at the Chinese Center for Disease Control in Beijing - showed positive results.
疾病控制中心发现有3种盛行试验在检测季节流感更好，H3N2感染准确性超过80%。
The three popular tests were better at detecting seasonal influenza, catching more than 80 percent of H3N2 infections, the CDC found.
疾病控制中心小组报告，检测猪流感试验的准确性范围是40%-69%。
The accuracy of the tests ranged from just 40 percent to 69 percent in detecting swine flu, the CDC team reported.
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