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【公司名稱】廣州健侖生物科技有限公司

【市場部】楊永漢
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【騰訊】
【公司地址】廣州市清華科技園健新基地番禺石樓鎮(zhèn)健啟路63號二期2幢101-103室

7在外界環(huán)境適宜時，自生世代可繼續(xù)多次，此過程稱為間接發(fā)育。經(jīng)多次的循環(huán)發(fā)育后，雄蟲逐次減少，以致消失，雌蟲則進(jìn)行孤雌生殖，但不能持久，蟲體zui終趨于死亡。當(dāng)外界環(huán)境不利于蟲體發(fā)育時，桿狀蚴蛻皮兩次，發(fā)育為絲狀蚴。此期幼蟲對宿主具有感染性，可經(jīng)皮膚或粘膜侵入人體，開始寄生世代，此過程稱為直接發(fā)育。寄生世代絲狀蚴侵入人體后，隨血循環(huán)經(jīng)右心至肺，穿破毛細(xì)血管，進(jìn)入肺泡。然后，沿支氣管、氣管移行至咽，被吞咽至消化道，并鉆入小腸（尤以十二指腸、空腸為多）粘膜，蛻皮2次，發(fā)育為成蟲。雌蟲多埋于腸粘膜內(nèi)，并在此產(chǎn)卵。蟲卵發(fā)育較快，數(shù)小時后即可孵化出桿狀蚴，并自粘膜內(nèi)逸出，進(jìn)入腸腔，隨糞便排出體外。自絲狀蚴感染人體至桿狀蚴排出，至少需要17天。嚴(yán)重腹瀉的患者，也可自糞便中排出蟲卵。除腸道外，糞類圓線蟲還可寄生于肺或泌尿生殖系統(tǒng)，隨痰排出的多為絲狀蚴，隨尿排出的多為桿狀蚴。在人體內(nèi)有無寄生性雄蟲，學(xué)者尚有爭論。
7 When the external environment is appropriate, self-generation can continue many times. This process is called indirect development. After many cycles of development, the males gradually decrease and disappear, and the females perform parthenogenetic reproduction, but they do not last long, and the insects eventually die. When the external environment is not conducive to the development of the body, the rod-shaped ecdysis twice, developed into a filiform ridge. During this period, the larvae are infectious to the host and can invade the human body through the skin or mucous membranes to begin parasitic generations. This process is called direct development. Parasitic filamentous ticks invade the human body and follow the blood circulation through the right heart to the lung, piercing the capillaries, and entering the alveoli. Then, it moved along the bronchus and trachea to the pharynx, swallowed to the digestive tract, and drilled into the small intestine (especially the duodenum and jejunum) mucous membrane. The moltings twice developed and became adult. Females are buried in the intestinal mucosa and spawn here. Eggs develop rapidly, and rod-shaped ticks can be hatched within a few hours, escape from the mucous membranes, enter the intestine, and excreted with the feces. It takes at least 17 days for the filamentous ticks to infect the body and to eject the stalks. Patients with severe diarrhea can also excrete eggs from the feces. In addition to the intestines, the roundworm nematodes can also be parasitized in the lungs or genitourinary system, and most of the discharges with the sputum are filamentous sputum, and most of the discharge with the urine is rod-shaped sputum. Whether there are parasitic males in the human body, scholars still have controversy.

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