寄生虫医学课件：13级双语本硕蚊蝇螨蚤.PPT

Yersinia pestis Plague! “东死鼠，西死鼠，人见死鼠如见虎。鼠死不几日，人死如拆堵”。 3. Disease transmission： Plague(鼠疫): Yersinia pestis Murine typhus(鼠型斑疹伤寒):Rickettsia mooseri Cestodiasis(绦虫病)： 恙螨 蛛形纲 --- 螨亚纲 --- 真螨目 --- 恙螨科 Chigger Mite Among the common genera in this family is Leptotrombidium deliensis (地理纤恙螨) in China. Larva of Leptotrombidium deliensis 地理纤恙螨幼虫 Morphology of larva Tiny mites, 0.2 to 0.5mm long, three pairs of legs, reddish or orange. Gnathosoma 颚体 The external structures of Leptotrombidium deliense larva Idiosoma 躯体 Chelicera 螯肢 Palpus claw 须肢 Back-hair背毛 Scutum 盾板 Side-hair 侧毛 Eye 眼 Sensillum 感器 居中纤恙螨 中华无前螨 地里纤恙螨 Egg Prelarva Larva Nymphochrysalis(若蛹) Nymph(若虫) Imagochrysalis(成蛹) Adult Life cycle Nymphochrysalis Prelarva Imagochrysalis 1. Breeding places: Wet, grassy, often where rodent activity; 2. Host a wide range: rodents (mainly), mammal, amphibian and human; 3. Habitat: human--skin of waist, armpits, groin, pudendum; Rat---uricle; 3. Food habit: intake of tissue fluid and lymph through stylostome(茎口). Bionomics and Habits 3. Food habit: intake of tissue fluid and lymph through stylostome(茎口). Bionomics and Habits 1. Chigger dermatitis or trombidiosis: 2. Tsutsugamushi disease(恙虫病): Medical Importance Pathogen: R.tsutsugamushi(恙虫立克次体)or Orientia Tsutsugamushi (东方体) Mode of transmission: trans-ovarian type. Clinical manifestation: high fever, lymphadenopathy, rashes, where bite has coagulum. 1. Environmental management: 2. Chemical measure: 3. Personal protection. Control 疥 螨 Sarcoptes scabiei 节肢动物门 --- 蛛形纲 --- 螨亚纲 --- 真螨目 --- 疥螨科 --- 疥螨属 Morphology of Sarcoptes scabiei adult Dorsum and venter of Scab mite adult Male Female Female are 0.3-0.5mm long by 0.25-0.4mm wide Male are 0.2-0.3mm long by 0.15-0.2mm wide Chaeta 刚毛 Ambulacra 吸垫 Scutum 盾板 Life cycle Deutonymph Protonymph Habitat： Scabies 疥疮 Clinical manifestations and Pathogenesis Scabies 疥疮 Laboratory diagnosis -History of exposure; -Combine Clinical manifestati