Transcript Sarcoptes scabiei var.suis 猪疥蟎第八组

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