經jing帶dai菌jun的de鴨ya蛋dan感gan染ran沙sha門men氏shi菌jun或huo出chu殼ke雛chu鴨ya在zai孵fu化hua器qi感gan染ran病bing菌jun
，常chang呈cheng敗bai血xue症zheng經jing過guo，往wang往wang不bu顯xian任ren何he症zheng狀zhuang則ze迅xun速su死si亡wang。年nian齡ling較jiao大da的de幼you禽qin則ze常chang取qu亞ya急ji性xing經jing過guo。嗜眠呆立，垂頭閉眼，兩翼下垂，羽毛鬆亂，顯著厭食，飲水增加，水泄樣下痢
，肛門粘有糞便，怕冷而靠近熱源或相互擁擠。呼吸症狀不常見到。雛鴨出現顫抖、喘息及眼瞼浮腫等症狀，常猝然倒地而死
，故有“猝倒病”之稱。

2.病(bing)變(bian)雛(chu)鴨(ya)感(gan)染(ran)沙(sha)門(men)氏(shi)菌(jun)，肝(gan)髒(zang)顯(xian)著(zhu)腫(zhong)大(da)，呈(cheng)青(qing)銅(tong)色(se)，並(bing)有(you)灰(hui)色(se)壞(huai)死(si)灶(zao)。氣(qi)囊(nang)呈(cheng)現(xian)輕(qing)微(wei)混(hun)濁(zhuo)，有(you)黃(huang)色(se)纖(xian)維(wei)蛋(dan)白(bai)樣(yang)斑(ban)點(dian)。盲(mang)腸(chang)內(nei)形(xing)成(cheng)幹(gan)酪(lao)樣(yang)物(wu)，直(zhi)腸(chang)腫(zhong)大(da)並(bing)有(you)出(chu)血(xue)點(dian)。還(hai)有(you)心(xin)包(bao)炎(yan)、xinwaimoyanjixinjiyan。chengnianyazaiziranqingkuangxia
，yibanweimanxingdaijunzhe，changbuchuxianzhengzhuang。bingjuncunzaiyuneizangqiguanhechangdaozhong。jixingbinglihanjian，youshikechuxianshuixieyangxiali
、精神沉鬱、倦怠
、兩翅下垂、羽毛鬆亂等症狀。急性感染病變見肝

、脾

、腎shen充chong血xue腫zhong脹zhang，出chu血xue性xing或huo壞huai死si性xing腸chang炎yan。心xin包bao炎yan及ji腹fu膜mo炎yan。在zai產chan卵luan鴨ya中zhong
，可ke見jian到dao輸shu卵luan管guan的de壞huai死si和he增zeng生sheng，卵luan巢chao的de壞huai死si和he化hua膿nong，這zhe種zhong病bing變bian常chang擴kuo展zhan為wei腹fu膜mo炎yan。慢man性xing感gan染ran的de成cheng年nian鴨ya特te別bie是shi腸chang道dao帶dai菌jun者zhe，常chang無wu明ming顯xian的de病bing變bian。最zui急ji性xing死si亡wang的de病bing鴨ya，也ye完wan全quan不bu見jian病bing變bian。