初步筛查结果呈阳性，需要进行进一步的诊断检测。

The initial screening came back ___positive, requiring further diagnostic tests.

令所有人松了一口气的是，活检结果不是阳性。

To everyone's relief, the biopsy result was not ___positive.

抗体检测呈阳性表明过去接触过该病毒。

A ___positive test for the antibody indicates past exposure to the virus.