WS/T 379-2012 in English
VALIDDiagnosis of taeniasis
- Issued on:2012-06-04
- Implemented on:2012-10-15
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本标准规定了带绦虫病的诊断依据、诊断原则、诊断和鉴别诊断。
本标准适用于全国各级医疗机构和疾病预防控制机构对带绦虫病的诊断。
Introduction
Standard Background and Technical Evolution
WS 379-2012 is the first diagnostic standard for Taeniasis in my country, integrating the diagnostic technical specifications of Taenia solium, Taenia saginata and Taenia asiatica. The standard was changed from mandatory to recommended after review in 2016, but its technical content is still the core basis for current clinical practice.
Comparison of etiological characteristics
| Characteristics | Porcine tapeworm | Saginata saginata | Asian tapeworm |
|---|---|---|---|
| Scolex structure | Spherical, with apical protrusion and two circles of small hooks | Square, without apical protrusion and small hooks | Similar to Saginata saginata but slightly smaller |
| Body length | 2-4 meters | 4-8 meters | 3-5 meters |
| Gravid segment uterus branch | 7-13 sticks/side | 15-30 sticks/side | Similar to Taenia saginata |
| Intermediate host | Pig/human | Cattle | Wild boar/pig |
Diagnostic technical specifications
Comparison of etiological examination methods
- Direct fecal smear method: Basic screening, detection rate is about 30%
- Modified Kato-Katz thick smear method: Egg concentration technology, detection rate increased to 60%
- Anal swab method: Best for Taenia saginata, with a positive rate of up to 85%
- Adult worm examination after deworming: The gold standard for diagnosis, morphological identification of the scolex is required
Typical case: A patient in a pastoral area had persistent abdominal pain and anal itching, and eggs were detected by anal swab method. After deworming treatment, the complete worm body was obtained, and the square scolex without hooks confirmed the infection of Taenia saginata.
Clinical implementation recommendations
- Patients in endemic areas with gastrointestinal symptoms should be screened for taeniasis first
- Those infected with Taenia solium must be evaluated for cysticercosis
- Feces should be collected 72 hours after deworming treatment to examine the excretion of scolex
- The diagnosis of Asian Taenia asiatica should be combined with epidemiological history and intermediate host investigation
Key points of standard update
After the nature of the standard was adjusted in 2016, Chapter 6 Differential Diagnosis became a recommended clause, but the etiological examination method (Clause 3.3) is still recommended as a mandatory requirement. Special attention should be paid to the associated diagnosis of Taenia solium and cysticercosis in clinical practice.
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