慢性感染的兒童每有體重減輕，發育滯緩，患者常有乳糖、木糖、維生素A和維生素 B12以及脂肪吸收異常。檢查1.病原診斷（1）糞便檢查用生理鹽水涂片法檢查滋養體，經碘液染色涂片檢查包，也可用甲醛沉淀或硫酸鋅濃集法檢查包。通常在成形糞便中檢查包，而在水樣稀薄的糞便中查找滋養體。由于包形成有間歇的特點，故檢查時以隔天糞檢并連續3次以上為宜。（2）十二指腸液或膽汁檢查糞便多次性者可用此法，以提高陽性檢出率。（3）腸檢膠法讓受檢者吞下裝有尼龍線的膠，線的游離端留于口外，膠溶解后，尼龍線松開伸展，3～4小時后到達十二指腸和空腸，滋養體粘附于尼龍線上，然后慢慢地拉出尼龍線，刮取附著物鏡檢。2.免疫診斷為輔助診斷，主要有酶聯免疫吸附試驗(ELISA)、間接熒光抗體試驗(IFA)和對流免疫電泳(CIE)等方法，其中ELISA簡單易行，檢出率高(92%～98.7%)等特點，適用于流行病學的調查。診斷本病主要癥狀是腹痛、腹瀉、腹脹、嘔吐、發熱和厭食等，典型病人表現為以腹瀉為主的吸收不良綜合征，腹瀉呈水樣糞便，量大、惡息、無膿血。兒童患者可由于腹瀉，引起貧血等營養不良，導致生長滯緩。
Every child with chronic infection loses weight and develops slowly. Patients often have lactose, xylose, vitamin A and vitamin B12, and abnormal fat absorption. Inspection 1. Pathogen diagnosis (1) Excrement examination The trophozoites were examined by physiological salt water smears and smeared with iodine solution. They can also be inspected using formaldehyde precipitation or zinc sulfate concentration method. The bag is usually inspected in the molded feces, while the trophozoites are found in the faeces of the water sample. Due to the intermittent formation of the bag, it is advisable to use a fecal test on the next day and more than 3 consecutive times. (2) duodenal juice or bile examination feces can be used multiple times to increase the positive detection rate. (3) Intestinal inspection method The subjects were allowed to swallow the glue with nylon thread. The free end of the thread was left outside the mouth. After the glue was dissolved, the nylon thread was loosened and stretched, and reached the duodenum and jejunum after 3 to 4 hours. The trophozoite adheres to the nylon thread, then slowly pulls out the nylon thread and scrapes the attachment for microscopic examination. 2. Immunodiagnosis As an auxiliary diagnosis, there are mainly enzyme-linked immunosorbent assay (ELISA), indirect fluorescent antibody assay (IFA), and convection immunoelectrophoresis (CIE). Among them, the ELISA is simple and easy, and the detection rate is high (92%~ 98.7%) and other characteristics apply to epidemiological investigations. The main symptoms of this disease are abdominal pain, diarrhea, abdominal distention, vomiting, fever, and anorexia. The typical patient is characterized by malabsorption syndrome with diarrhea as the main symptom. Diarrhea presents with watery feces. It is large in quantity, noisy, and has no pus. Children with diarrhea can cause malnutrition, such as anemia, and cause growth retardation.

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