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Sarcoptes scabiei var.suis 猪疥蟎 第八组: 刘慧思 朱政怡、王雪洁、 曾莉、程田 Introduction • Pathogen: Sarcoptes scabiei var.suis • Chronic dermatosis(慢性皮肤病) • Widespread • It makes the skin itchy (发痒), rough(粗糙),scrap(落屑),chap(皲裂) and intolerably dirty (污秽不堪),so it is also called swine favus(猪癞)。 • It significantly depresses grown rate and feed efficiency. Morphology(dioecism雌雄异体) • Egg: • Oval(椭圆形)、 transparent(透明的)、 150μm×100μm • Larva(幼虫): • Three pairs of feet • Nymph (若虫): • resemble the adult (类似 成虫) • seta(刚毛) • clavula(小棘) • chewing mouthpart (咀嚼式口器) • Feet • Handle(柄) • Sucker(吸盘) How to distinguish between male and female ? • • handle and sucker (柄和吸盘) Seta (刚毛) famale Length:0.339~0.509mm Width:0.283~0.358mm male 0.226~0.339mm 0.169~0.243mm Life cycle fertilization (受精) in the tunnel The whole cycle: 2-3 weeks molting(蜕皮)on the skin surface or in a pocket(小穴) hatching(孵 化)in 3-4 days in the tunnel Pathogenesis and Symptoms • Site: head, ear back, bilateral trunk (躯干两侧) and hind limb(后肢) all over the body Pathogenesis and symptoms: Inflammation (发炎) Skin irritation (刺激皮肤) Gargalesthesia (痒感) Itching and rubbing (瘙痒) Thick,dry and chappy skin (龟裂的) scab(结痂) Decreased appetite (食欲减退) Emaciation (消瘦) Papule and bubble (丘疹和水泡) Pyogenic bacteria (化脓菌) Running sore (脓疮) Itching and rubbing/scratching (瘙痒和摩擦) Papule and bubble (丘疹和水泡) Haemorrhages and scab (出血 和结痂) Thick, dry and chappy(龟裂的)skin Thickened skin and crusts(痂皮) in the ears Epidemiology • Distribute all over the world . (Sarcoptes scabiei has been reported in over 100 mammals, including humans.) • The mite spreads directly from pig to pig, either by close skin contact or contact with recently contaminated surfaces. • The boar(公猪) helps to maintain infection in the herd(畜群)because he is constantly in direct skin contact with breeding females and he remains a chronic carrier(长期带虫). • Newly purchased pigs • There is a high potential risk in the cold season. Diagnosis This is confirmed by demonstrating the presence of the mite. (Scarapings for microscopic examination) Steps: 1 collection of scales 2 experimental method Treatment and prevention