Trichinella spiralis(旋毛蟲)

 
Nematoda(線蟲)
學名
Trichinella spiralis
中文名
旋毛蟲
體型(成蟲)
F:2.8~3.2mm*0.069~0.09mm
M:1.4~1.5mm*0.06mm
幼蟲:
0.09-0.1mm

資料來源:美國奧克拉荷馬州大學
-
微絲蟲尾核
-
微絲蟲頭部間隙
-
sucking groove/sucker
-
oral sucker
ventral sucker
genital sucker
 
生殖開口位置
-
睪丸數量
型態
-
Vitellaria位置
-
ovary位置
一隻female具有1500顆卵
uterus位置
型態
-
成熟節片
-
受孕節片
-
雌性生殖系統套數
1,生殖孔(vulva)較靠近頭端、單套生殖系統。
交配刺
2片尾翼( Caudal appendage ),不是交配刺(spicule)
肌肉層
?
口囊
?
/胎生
胎生
形狀大小
-
卵殼
-
顏色
-
內容物
-
囊幼/擬囊幼
 
人類角色(宿主)/完整宿主圈
人:FH
囓齒類:IMH


資料來源:美國CDC
A. 包囊幼蟲(Encysted larva in muscle)具感染力,寄生部位為橫紋肌,蟲囊延肌肉走向排列。
B. 因為消化液可消化蟲囊而釋放幼蟲,在小腸道發育成成蟲。
C. 一般在自然界中的生活史是靠豬與食肉動物間的循環來維持。
D. 同一動物可同時扮演中間宿主與終宿主,但無法扮演同一隻蟲的兩種宿主,因為需要藉由吃下被寄生的肉而釋放包囊幼蟲。
E. 要完成完整的生活史至少需要兩個宿主。
成蟲寄生位置
小腸腸道
感染源
Encyst larva
感染方式
口食
移行
口食幼蟲成蟲於腸道排出幼蟲
幼蟲移至橫紋肌(鈣化)
幼蟲疾病
I.腸時期
腹痛、嘔吐
II.
輕微感染(通常無症狀)
a.
腸胃
b.
肌炎
c.
有包囊幼蟲,但身體逐漸修復
III.
重度感染
a.
呼吸系統
b.
心肌
c.
腦和腦膜
成蟲疾病
-
診斷
臨床診斷(飲食習慣)
l
肌肉切片
l
免疫診斷
流行病學
 
治療
Mebendazole
thiabendazole
albendazole
經土壤
?
Rhabditiform larva
-
Filariform larva
-
microfilaria
-
絛蟲Larva系列
-
備註
 
1.幼蟲:
a. 胎生,在橫紋肌發育,可成長10倍為0.1mm。
b. 發育數周後,會引發宿主免疫反應而囊化,一顆囊內有兩隻幼蟲,稱為包囊幼蟲(encyst larva),具感染力。
2. 病理學和症狀學(Pathology and Symptomatology)

資料來源:維基百科

資料來源:parasitewonders
宿主由兩端nurse cell開始鈣化,逐漸失去感染力而死亡。
A. 輕微感染(通常無症狀,約100隻以上有症狀)
a. 小腸階段Intestinal stage(孵化期incubation period):噁心、嘔吐、腹瀉、頭痛、腹痛。
b. 侵入肌肉階段Muscle invasion stage(急性或幼蟲移行):肌炎:發燒、寒顫、流汗、肌痛。
水腫:眼、鼻、太陽穴和手。
c. 恢復期Convalescence stage(定義為疾病結束到完全康復這段期間):無症狀,開始有包囊幼蟲,身體逐漸修復。
B. 重度感染(每克肌肉超過100隻幼蟲)
a. 呼吸系統:頭痛、喉嚨痛、肺炎、呼吸困難。
b. 心肌:心搏過速、低血壓、末稍水腫、心肌炎。
c. 腦和腦膜:頭痛、恍惚、昏迷、腦炎、腦膜炎。
4. 診斷(Diagnosis)
診斷
l 臨床診斷(飲食習慣)
l 肌肉切片
l 免疫診斷
治療方法
Mebendazole( thiabendazole or albendazole )
流行病學
全球有吃豬肉的國家皆有機會感染。
預防
l 豬肉應適當煮熟
l 豬肉篩檢
l 滅鼠
l 去除感染力:放-15℃,20天或 50-60℃,30秒。
▼寄生蟲(parasite) 顯示/隱藏(show/hide)

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