絲蟲(chóng)是由節(jié)肢動(dòng)物傳播的一類線蟲(chóng),寄生于人體的已知有8種,其中班氏絲蟲(chóng)和馬來(lái)絲蟲(chóng)引起的淋巴絲蟲(chóng)病（Filariasis)及由盤尾絲蟲(chóng)所致的"河盲癥"對(duì)人類危害最嚴(yán)重。我國(guó)只有前兩種：班氏吳策線蟲(chóng)（Wuchereria bancrofti)和馬來(lái)布魯線蟲(chóng)（Brugia malayi)。
一、形態(tài)
成蟲(chóng)
乳白色，細(xì)長(zhǎng)如絲線，體長(zhǎng)不到1cm；雄蟲(chóng)尾端卷曲半到3圈，具交合刺。雌蟲(chóng)大于雄蟲(chóng)，尾端直。
班氏與馬來(lái)微絲蚴形態(tài)鑒別
|
項(xiàng)目 |
班氏微絲蚴 |
馬來(lái)微絲蚴 |
| 體態(tài) 頭隙 尾核 |
柔和，彎曲 較大較短，長(zhǎng)短于寬；清晰可數(shù) 無(wú) |
硬直，大彎上有小彎 較長(zhǎng)，長(zhǎng)大于寬；不易數(shù)清 有2個(gè)，前后排列 |
Microfilaria of Wuchereria bancrofti
stained with haematoxylin. Sheath is visible at the posterior end. ×400. Enlarged by 5.4.
Microfilaria of Wuchereria bancrofti
stained with Giemsa. Sheath is not stained, but appears as an empty space. ×400. Enlarged by 5.4.
Microfilaria of Brugia malayi
stained with Giemsa. The sheath takes a dark pink stain. ×400. Enlarged by 5.4.
Microfilaria of Brugia malayi
showing the terminal nuclei and the darkly staining sheath. Giemsa. ×800. Enlarged by 5.4.
Microfilaria of Brugia malayi
showing the terminal nuclei. Acridine orange. ×800. Enlarged by 5.4.
感染期幼蟲(chóng)又叫絲狀蚴，寄生于蚊體內(nèi)，為感染階段。
