如何区分细菌感染与病毒感染?

2017-07-06 张喵 华医网

细菌感染和病毒感染的临床本质和治疗方法都不同,因此对于怀疑感染的患者首先要做的就是鉴别感染的病原体。但如何鉴别这一问题其实至今都尚无定论,那么是否存在准确且敏感的标志物?如何快速、简便地鉴别细菌感染与病毒感染呢?



细菌感染和病毒感染临床本质和治疗方法都不同,因此对于怀疑感染的患者首先要做的就是鉴别感染的病原体。但如何鉴别这一问题其实至今都尚无定论,那么是否存在准确且敏感的标志物?如何快速、简便地鉴别细菌感染与病毒感染呢?

经典的鉴别方法——血常规

到医院就诊,一般查血常规是必做的项目,这其实不无道理。在鉴别感染类型方面,主要看的是白细胞、中性粒细胞和淋巴细胞三项。感染时白细胞经常升高,中性粒细胞百分比升高见于急性感染,尤其是革兰阳性球菌感染,淋巴细胞百分比升高见于病毒感染等。虽然相继有研究表明以这几项指标判断感染类型并不十分特异,但由于此观念来源甚久且作为初筛来说也有一定意义,加上血常规最简便易行,因此就成了临床医生判断感染类型的第一步。

但要知道判断感染类型绝不能单独应用血常规的几项指标就得出定论,只能说能得到一个更可能的倾向。要想知道更确定的答案,就需结合临床病史及其他实验室检查综合判断。

新的标志物

那么还有哪些检测项目有助于鉴别细菌感染和病毒感染呢?近些年来这方面的研究不少,也相继出现了许多新的预测指标,如C反应蛋白(CRP)、降钙素原(PCT)、人中性粒细胞载脂蛋白(HNL)等等。它们在细菌感染时升高往往较病毒感染明显。

2015年的一项研究调查了200余名患者,发现细菌感染的患者CRP水平为36.65±25.85,病毒感染患者的CRP水平为9.23±5.14,具有统计学差异。此外还有研究表明,CRP的升高幅度和细菌感染程度相符合,且相较于血常规里的几项指标而言,细菌感染时CRP 升高要早于白细胞,因此更敏感,适用范围也更广。因此,CRP也是鉴别感染类型的一个不错的指标。

除此之外,更有一些在分子水平上的研究来帮助鉴别感染类型,如CD64、 CD35分子的表达等,但其临床意义仍需进一步确认。

然而这些指标也不是百分百准确。近年来的研究报告指出,CRP水平>20mg/L可以考虑细菌感染,其敏感性为77%,特异性为79%,也就是说仍存在一定误差,因此也只能是帮助我们鉴别感染类型的一项辅助指标。

那么靠谱的方法究竟是啥?

说了这么多,都是没有定论的东西,那么判定感染类型到底有没有确定的标准?答案当然是有的。作为患者要知道,判断病原体的金标准永远都是培养。即从患者身上取到标本后,能在培养基上长出相应菌落,或者分离培养出病毒,就证明感染了相应的病原体。

拿呼吸道感染为例,怀疑感染时,临床医生往往会在血常规等较简单的检查结果中做出初步判断,但同时也会开痰涂片和痰培养的检查。痰涂片的目的是在镜下找病原体,痰培养的目的则是在特定培养基上培养后看是否长出相应的菌。相比较而言,这两项标准更直观,因此也是临床确诊感染类型的方式(但要知道,做出确定诊断的前提是取到合格的标本,因此如何留到合格的痰十分重要)。

具体到感冒上,如何鉴别不同类型的感冒?

生活中常见的感冒大致可以分为三种:普通感冒、流行性感冒、急性咽-扁桃体炎。




此外,无论哪一种感冒,患者都应充分休息,清淡饮食、多饮水、加强营养并疏通大便。禁食辛辣、烧烤、油腻、戒烟戒酒。平时加强锻炼,增强体质,提高机体抵抗力,避免受凉、淋雨、过度疲劳等致病因素。

参考文献:

[1]、Xu S Y, Pauksen K, Venge P. Serum measurements of human neutrophil lipocalin (HNL) discriminate between acute bacterial and viral infections.[J]. Scandinavian Journal of Clinical & Laboratory Investigation, 1995, 55(2):125-31.

[2]、中华医学会呼吸病学分会哮喘学组. 咳嗽的诊断与治疗指南(2015)[J]. 中华结核和呼吸杂志, 2016, 39(5).

[3]、王辰,王建安.内科学(第3版).人民卫生出版社. 2015.

[4]、黄长英,刘升长,马广强等.C反应蛋白在区分细菌性与病毒性感染诊断中的临床应用价值[J].医学信息,2015,(35):361-361.

[5]、Sasaki K, Fujita I, Hamasaki Y, et al. Differentiating between bacterial and viral infection by measuring both C-reactive protein and 2'-5'-oligoadenylate synthetase as inflammatory markers.[J]. Journal of Infection and Chemotherapy, 2002, 8(1):76-80.


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    2017-08-07 一个字-牛

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    2017-07-28 jyzxjiangqin

    科学区分及治疗。

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    2017-07-13 jyzxjiangqin

    科学区分细菌感染和病毒感染。

    0

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    2017-07-08 1dd8c52fm63(暂无匿称)

    不错不错啊

    0

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    2017-07-06 清风拂面

    谢谢分享,学习了

    0

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