对病人样本的最初检测结果呈阴性。
Initial tests on patient specimens produced negative results.
许多患者的粪便潜血检测结果呈阴性，但却患有结肠息肉。
Many patients with colon polyps are tested negative for stool occult blood.
微生物检测结果呈阴性，表明细胞未受到细菌、真菌、病毒及支原体污染。
Type of cell is absolute fibroblast. 4 The results of microbial detection showed that cultured cells were not contaminated by bacteria, yeasts, fungi, virus and mycoplasma.
9月27日获得的初步检测结果为H5病毒亚型呈阴性，H1亚型呈阳性，表明感染正常的季节性流感。
Initial test results received on 27 September were negative for the H5 virus subtype and positive for the H1 subtype, indicating an infection with normal seasonal influenza.
这引起了克拉科夫斯基同事们的猜疑，于是他们决定对其中的20名患者重新进行检测，结果均呈HIV阴性。
Their suspicions aroused, Mr Klarkowski's colleagues decided to retest 20 of these patients. All 20 were HIV negative.
在艾滋病窗口期内，艾滋病病毒感染者的血液检测查不到艾滋病病毒抗体，结果呈阴性。
AIDS window period, HIV can not find out the blood tests of HIV antibodies, the results were negative.
在艾滋病窗口期内，艾滋病病毒感染者的血液检测查不到艾滋病病毒抗体，结果呈阴性。
AIDS window period, HIV can not find out the blood tests of HIV antibodies, the results were negative.
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