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铜绿假单胞菌感染学习笔记(1)

  • 2026-04-13 12:01:59
铜绿假单胞菌感染学习笔记(1)

一、微生物学

革兰阴性非发酵需氧杆菌,在环境中广泛分布,可在多种培养基上生长。

识别要点:特征性的葡萄样香甜气味。

常产生绿色色素(部分菌株不产生)。

氧化酶试验阳性。

二、流行病学:

铜绿假单胞菌是主要的烧伤创面病原体,是中性粒细胞减少患者发生菌血症的一个严重病因;

铜绿假单胞菌是一般人群中医疗保健相关感染的常见病因

铜绿假单胞菌是CF囊性纤维化成人患者中最常见的病原体;

铜绿假单胞菌引发的社区获得性感染越来越多,包括:毛囊炎(由热水浴缸、涡旋浴缸或被污染的海绵引起)、肺炎、刺伤后骨髓炎、注射吸毒者的心内膜炎、在淡水湖泊游泳后的外耳道炎、腹膜透析患者的腹膜炎或出口部位感染,以及艾滋病患者中的社区获得性菌血症和肺炎。

铜绿假单胞菌也是支气管扩张患者的重要致病菌,多重耐药性铜绿假单胞菌会成为其中许多患者的终末致病菌。

COVID-19重症患者:是继发细菌感染和VAP(呼吸机相关肺炎(ventilator-associated pneumonia, VAP)的重要病原体。

三 抗生素耐药趋势:

铜绿假单胞菌对一些抗生素天然耐药,并且还可在治疗过程中获得更多耐药性,增强其细菌毒力。

机制多样:

产生AmpC(β-内酰胺酶

ESBL酶(超广谱β-内酰胺酶(extended spectrum beta-lactamase, ESBL)

外膜孔蛋白OprD缺失(一种碳青霉烯类特异性孔蛋白):碳青霉烯类耐药

外排泵高表达:多重耐药

生物膜形成

可能从放线菌中转移获得16S rRNA甲基化酶基因

现状:多重耐药株在院内感染中占比约11.9%,VAP中耐药率更高。COVID-19大流行期间耐药率有所反弹。

三、发病机制

铜绿假单胞菌拥有两种截然不同的致病模式,对应大量毒力因子的差异表达。

1. 囊性纤维化中的慢性持续感染

特征:毒力因子下调(鞭毛、菌毛丢失),黏液表型形成(藻酸盐生物膜)。

机制:CFTR缺陷:导致细菌清除能力受损,上皮细胞结合增加。

生物膜形成:抵抗抗生素杀伤和宿主免疫清除,促进气道内长期定植。

适应性进化:菌株发生高突变,以适应肺部厌氧及炎症微环境。

2. 急性侵袭性感染

特征:表达强毒力因子,引发菌血症、重症肺炎及脓毒性休克。

关键毒力因子:运动与黏附:鞭毛和菌毛是最大侵袭力的必需条件。

III型分泌系统毒素(ExoS、ExoU、ExoT):直接破坏宿主细胞膜完整性,与高死亡率显著相关(感染产毒株死亡风险增加6倍)。

其他产物:外毒素A、弹性蛋白酶、磷脂酶C、脂多糖(内毒素)等参与组织损伤和脓毒症病理过程。

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  133. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
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  137. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/no.67808.cn/runtime/temp/6df755f970a38e704c5414acbc6e8bcd.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001070s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001561s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000715s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000668s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001452s ]
  6. SELECT * FROM `set` [ RunTime:0.004634s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001514s ]
  8. SELECT * FROM `article` WHERE `id` = 480477 LIMIT 1 [ RunTime:0.001286s ]
  9. UPDATE `article` SET `lasttime` = 1776059606 WHERE `id` = 480477 [ RunTime:0.010553s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000720s ]
  11. SELECT * FROM `article` WHERE `id` < 480477 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001197s ]
  12. SELECT * FROM `article` WHERE `id` > 480477 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001070s ]
  13. SELECT * FROM `article` WHERE `id` < 480477 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002267s ]
  14. SELECT * FROM `article` WHERE `id` < 480477 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002522s ]
  15. SELECT * FROM `article` WHERE `id` < 480477 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012057s ]
0.206152s