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精品课件:猪痢疾

  • 2026-04-03 03:12:01
精品课件:猪痢疾

猪痢疾专业简介

猪痢疾(Swine Dysentery,SD)又称猪血痢、黑痢或黏液出血性下痢,是由猪痢疾短螺旋体Brachyspira hyodysenteriae,原名猪痢疾密螺旋体)引起的一种猪特异性肠道传染病。该病以大肠黏膜的卡他性出血性炎症为核心病理特征,临床表现为黏液性、出血性下痢,对全球养猪业造成显著经济损失159

一、流行病学特征

  • 宿主与易感群体:仅感染猪,不同品种和年龄均易感,但7–12周龄仔猪发病率与死亡率最高,成年猪常呈隐性感染17

  • 传播途径:主要通过消化道传播。病猪和带菌猪是主要传染源,其粪便污染饲料、饮水及环境;猫、鼠、蝇类等可机械性传播病原13

  • 流行规律:无季节性,流行缓慢且持久,应激因素(如饲养管理不良、运输、气候突变)可诱发本病79

二、临床症状与病程

  • 潜伏期:自然感染多为7–14天19

  • 急性型精神沉郁,体温升至40–40.5℃,初期排黄色软便,后转为水样血痢,内含黏液、血液及坏死组织碎片,腥臭味明显。患猪脱水消瘦,1–2周内衰竭死亡,死亡率较高15

  • 慢性型病程延至2–6周,间歇性下痢,粪便灰白带黏液或暗红血液。猪只进行性消瘦、生长停滞,部分康复后易复发139

三、特征性病理变化

病变集中于大肠(盲肠、结肠、直肠),小肠不受累,回盲口为病变分界1810

  • 急性期:大肠黏膜充血、水肿,肠腔充斥血样黏液,肠系膜淋巴结肿大。

  • 慢性期:黏膜表面覆盖纤维素性坏死伪膜,剥落后呈麸皮样或豆腐渣样溃疡710

  • 组织学病变:黏膜上皮坏死脱落,杯状细胞增生,腺窝萎缩;镀银染色可见大量螺旋体聚集于黏膜表层810

四、防治策略

  1. 预防措施

    • 坚持自繁自养,引种时严格隔离检疫1–2个月19

    • 加强环境卫生管理,落实全进全出制和粪便无害化处理57

    • 尚无商品化有效疫苗,依赖综合防控13

  2. 治疗与净化

    • 首选药物:痢菌净(5mg/kg口服,每日2次,连用5天)、二甲硝基咪唑(250mg/L饮水)、林可霉素(100g/吨饲料)179

    • 停药后易复发,需药物与管理结合;重症猪建议淘汰,逐步建立无病原猪群15


猪痢疾不同病程阶段的主要特征

病程阶段病程时间典型粪便特征主要病理变化死亡率
急性期
1-2周
水样血痢,含黏液和坏死组织
大肠黏膜充血水肿,肠腔血样内容物
慢性期
2-6周
灰白色稀便带黏液或暗红血液
黏膜纤维素性坏死伪膜,麸皮样溃疡
低(但高复发)

猪痢疾以大肠出血性炎症血痢为核心标志,其病原体在环境中抵抗力强,使防控依赖生物安全与药物净化的协同。最新研究(如莱昂大学2024年)聚焦早期感染生物标志物(如触珠蛋白升高)和粪便排菌动态,为精准干预提供新方向2。该病仍是规模化猪场肠道病防控的重点挑战,根除需结合诊断技术升级与健康管理体系的持续优化。

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  1. CONNECT:[ UseTime:0.001187s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001646s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000702s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000729s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001391s ]
  6. SELECT * FROM `set` [ RunTime:0.000619s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001486s ]
  8. SELECT * FROM `article` WHERE `id` = 468549 LIMIT 1 [ RunTime:0.001078s ]
  9. UPDATE `article` SET `lasttime` = 1775319680 WHERE `id` = 468549 [ RunTime:0.001580s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000459s ]
  11. SELECT * FROM `article` WHERE `id` < 468549 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000503s ]
  12. SELECT * FROM `article` WHERE `id` > 468549 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000393s ]
  13. SELECT * FROM `article` WHERE `id` < 468549 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000734s ]
  14. SELECT * FROM `article` WHERE `id` < 468549 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001297s ]
  15. SELECT * FROM `article` WHERE `id` < 468549 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001225s ]
0.111345s