兒童患者可由于腹瀉，引起貧血等營養不良，導致生長滯緩的疾病。若不及時治療，多發展為慢性，表現為周期性稀便，反復發作，大便甚臭，病程可長達數年。人體感染賈第蟲后，潛伏期平均為1～2周，zui長者45天。相當一部分不出現任何臨床癥狀，成為帶蟲者，有出現輕微癥狀者，也有出現嚴重癥狀者，其臨床表現以腹痛、腹瀉、厭食多見，典型患者表現為以腹瀉為主的吸收不良綜合征，可有爆發性水瀉，惡臭、無膿血，含大量脂肪顆粒。兒童久病不愈可致營養不良、貧血、發育障礙等。如寄生在膽道系統，可出現膽炎或膽管炎。若不及時治療，多發展為慢性，表現為周期性稀便，反復發作，大便甚臭，病程可長達數年。可分為全身性癥狀、膽道系統癥狀和腸胃道癥狀3類。1.全身性癥狀（1）神經癥狀如失眠、頭痛、乏力、眩暈、眼發黑、出汗、神經興奮性增強、肌腱反射亢進等較為常見。（2）甲狀腺機能失調曾有人發現部分（15.5%）藍氏賈第鞭毛蟲病患者的甲狀腺機能有改變，其中以甲狀腺機能亢進占大多數，基礎代謝增高16%～20%，部分患者可增高30%，因而也會產生甲狀腺機能亢進的癥狀。2.膽道系統癥狀藍氏賈第鞭毛蟲在膽道系統寄生，可以引起膽炎及膽管炎。
Children suffer from malnutrition such as anaemia due to diarrhea, resulting in slow-growing disease. If it is not treated promptly, it develops more chronically. It is characterized by periodic loose stools, recurrent episodes, and very stinky stools. The course of disease can be as long as several years. After infection with Giardia, the average incubation period is 1 to 2 weeks and the longest is 45 days. A considerable part of the patients did not show any clinical symptoms and became persons with worms. Those with mild symptoms and severe symptoms were also present. Their clinical manifestations were abdominal pain, diarrhea, and anorexia. Typical patients presented with diarrhea-based malabsorption syndrome. , May have explosive watery diarrhea, odor, no pus and blood, containing a lot of fat particles. The prolonged illness of children can lead to malnutrition, anemia, and developmental disorders. If parasitic in the biliary system, there may be cholecystitis or cholangitis. If it is not treated promptly, it develops more chronically. It is characterized by periodic loose stools, recurrent attacks, and a very foul smell of the stool. The course of disease can be as long as several years. Can be divided into systemic symptoms, biliary system symptoms and gastrointestinal symptoms 3 categories. 1. Physical symptoms (1) Neurological symptoms such as insomnia, headache, fatigue, dizziness, dark eyes, sweating, increased nerve excitability, and tendon reflexes are common. (2) Thyroid dysfunction Some people (15.5%) have seen changes in thyroid function in patients with Giardia lamblia, of which hyperthyroidism predominates, and basal metabolism increases by 16% to 20%. Some patients may increase. 30%, and thus also produce symptoms of hyperthyroidism. 2. Biliary System Symptoms Giardia lamblia is parasitized in the bile duct system and can cause cholecystitis and cholangitis.

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