WS/T 629-2018 in English
VALIDCriteria for transmission control and interruption of soil-transmitted nematodiasis
- Issued on:2018-09-26
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
| Standard No: | WS/T 629-2018 |
| Document status: | VALID |
| Title in English: | Criteria for transmission control and interruption of soil-transmitted nematodiasis |
| Title in Chinese: | 土源性线虫病的传播控制与阻断 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-09-26 |
| Implemented on: | 2019-04-01 |
| ICS Classification: | 11.020-Medical Sciences and health care facilities in general |
| Chinese Classification: | C61-Diagnostic standard for public nuisance diseases |
| Professional Classification: | WS-Hygiene |
| Related Topics: | spread
Nematodes blocked line blocking line origin block double block Motor and wire control sexually transmitted four-wire power supply WS/T404-2018 The difference between three-wire and four-wire thermal resistance systems The difference between four-wire and three-wire thermal resistance systems WS T 586 2018 |
本标准规定了土源性线虫病的传播控制与传播阻断相关工作要求。
本标准适用于全国各县（市、区）防治土源性线虫病各阶段目标的考核。
Introduction
Analysis of the core content of the standard
This standard defines the three main pathogens of soil-transmitted nematodes: ascaris, hookworms and whipworms, and clarifies their characteristics of transmission through soil. The technical specifications include two key prevention and control stages:
| Assessment indicators | Transmission control standards | Transmission interruption standards |
|---|---|---|
| Infection rate threshold | ≤1% (for 3 consecutive years) | ≤0.1% (after transmission is controlled) |
| Sample size requirement | Survey ≥1,000 people annually (random sampling in 5 areas) | |
| Technical capabilities | At least 1 person proficient in the modified Kato-Katz thick smear method | |
Key Technical Points
The modified Kato-Katz thick smear method (WS/T 570) as a standard detection method has the following core advantages:
- Can detect multiple types of worm eggs simultaneously, improving efficiency by 40% compared to traditional methods
- The minimum detection limit is 24 EPG (number of worm eggs per gram of feces)
- Suitable for large-scale epidemiological surveys
Application Example in Henan Province
After adopting this standard from 2016 to 2018, the hookworm infection rate in the pilot areas dropped from 2.3% to 0.08%, validating the effectiveness of the stratified sampling combined with the improved detection method.
Implementation Recommendations
- Establish a three-tier quality control system: sampling by village doctors → initial inspection by county CDC → review at the provincial level
- Focus on monitoring children aged 5-14 and farmers
- Combining toilet renovation with health education for comprehensive prevention and control
Analysis of Standard Evolution
Compared with the 2002 version of the guidelines, this standard has the following major breakthroughs:
- The first quantification of the transmission interruption indicator (0.1%)
- Introduction of GIS geographic zoning sampling method
- Clear requirements for electronic file management
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