由于發生水腫和纖維化，腸壁變厚、變硬，部分強直，粘膜萎縮并有多處潰瘍，直徑為2-50mm不等。光鏡下可見纖維化和粘膜下水腫，肌層萎縮，整個增厚的腸壁內都可發現蟲體。三其他病變：本蟲幼蟲在肺內移行時，可引起肺臟毛細血管充血、出血、毛細支氣管上皮細胞脫落，炎性滲出物中可查到幼蟲。如果幼蟲的肺腸停留時間過久而發育為成蟲，則多數形成粟樣大小的肺膿瘍。絲狀蚴在體內移行時，亦可侵入其他，如心內膜，肝臟、卵巢、腸系膜淋巴結及腦等處，并有肉芽腫形成。大頭金蠅別名紅頭蠅、綠蟲蠅，成蟲體長8～11毫米，綠藍色、有明顯光澤，頭部寬，頂部黑色，復眼大，深紅色，額中條褐紅色，顏和頰部橙黃色；觸角和小顎須呈褐色；胸腹部綠色偏藍，有紫色光澤，幼早成熟時，身體蛆形，為黃白色，前端尖細，末端截平。體分14節，頭部1節，3節，腹部10節，體表有小棘形成的環；蛹呈桶狀，為圍蛹，即蛹殼為第3齡幼蟲皮收縮而成。蛹的顏色由白逐漸變深，zui后為栗褐色。家蠅（Musca demestica）是家蠅屬（Musca），是*昆蟲，其生活史包括卵、幼蟲（蠅蛆）、蛹、成蟲（蒼蠅）四個階段，共需12～15天。成年雌蠅剛排出的卵很小，1克卵有13000個左右，當溫度在25℃、相對濕度70%時，孵化期為12小時。剛孵出的幼蟲為灰白色、怕光，在飼料表層下2～10厘米處活動、采食，生長速度極快，4～5天有1厘米長、重約30毫克，開始化蛹。
Due to edema and fibrosis, the wall of the intestine became thicker, harder, partially stiffened, and mucosal atrophy with multiple ulcerations ranging from 2-50 mm in diameter. Under the light microscope, fibrosis and submucosal edema can be seen. Muscular atrophy can be found in the entire thickened intestinal wall. Three other lesions: When the larvae of the larvae migrate in the lungs, they can cause capillary congestion, hemorrhage, and shedding of bronchial epithelial cells in the lungs. The larvae can be found in inflammatory exudates. If the larvae's lung intestine stays too long and develops into adults, most of them form a lung-like abscess of the size of a millet. When filopenads migrate in the body, they can also invade other parts, such as the endocardium, liver, ovary, mesenteric lymph nodes and brain, and have granuloma formation. The golden-headed fly is known as the red-headed fly and the green-fly fly. The adult body is 8 to 11 mm long. It is greenish blue with a distinct luster. The head is wide, the top is black, the compound eye is large, the deep red is red, the frontal middle bar is reddish-brown, and the cheeks are colored. Orange-yellow; tentacles and small beards are brown; chest and abdomen green bluish, purple luster, early maturation, body shape, yellow-white, sharp front end flattened. The body was divided into 14 sections, with 1 section in the head, 3 sections in the abdomen, 10 sections in the abdomen, and a ring formed by small spines on the body surface. The cormorant was in the shape of a barrel, which was a cocoon, ie, the shell of the third instar larvae was shrunk. The color of the clams gradually darkens from white, and finally it is chestnut brown.

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