This standard specifies the basis and content for the delineation and classification of Keshan disease lesions. This standard is applicable to the delineation and classification of Keshan disease lesions throughout the country. GB 17020-1997 Delineation and classification of Keshan disease lesions GB17020-1997 Standard download decompression password: www.bzxz.net

GB17020-1997
The delineation of Keshan disease wards in this standard is revised and supplemented on the basis of the "Standard for Delineation of Keshan Disease wards (Trial)". The classification of Keshan disease ward types is formulated this time. This standard provides a technical basis for the delineation and classification of Keshan disease wards in my country. From the date of entry into force, this standard will replace the "Standard for Delineation of Keshan Disease wards (Trial)".
Appendix A and Appendix B of this standard are both appendices to the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. This standard is drafted by the Keshan Disease Research Institute of the China Endemic Disease Prevention and Control Research Center. The drafter of this standard: Kang Baoan.
This standard is interpreted by the Chinese Academy of Preventive Medicine, the technical unit entrusted by the Ministry of Health. 494
1 Scope
National Standard of the People's Republic of China
Decide and delimit of
Keshan disease endemic area
This standard specifies the basis and content for the delineation and classification of Keshan disease endemic areas. This standard applies to the delineation and classification of Keshan disease endemic areas throughout the country. 2 Delineation of endemic areas
Any area that meets the following three conditions can be designated as an endemic area: a) There are or have been patients with acute, subacute or chronic disease; b) The onset of the disease meets the epidemiological characteristics of Keshan disease; c) The deceased is confirmed to have Keshan disease by pathological autopsy. GB17020—1997
Low selenium in the external environment can be used as a reference indicator for the delineation of endemic areas. The endemic area is based on the county, and the county should control the endemic area to the natural village. As long as there is a history of acute, subacute or chronic disease or current patients, it can be designated as a disease area village (village). 3 Disease area type division
According to the relatively stable characteristics of Keshan disease, the disease area is divided into severe, medium and mild disease areas according to the annual incidence of acute, subacute and natural chronic types in the high-incidence year.
3.1 Severe disease area, the annual incidence rate is greater than 100/100,000. 3.2 Medium disease area: annual incidence rate 50/100,000 to 100/100,000. 3.3 Mild disease area: annual incidence rate is less than 50/100,000. Approved by the State Administration of Technical Supervision on October 6, 1997, and implemented on October 1, 1998
GB 17020--1997
Appendix A
(Appendix to the standard)
Characteristics of regional distribution of Keshan disease
A1 The disease is obviously regional, and the disease areas are relatively stable. Within a province (region), only some counties, and within a county, only some townships are disease areas. Other counties and townships are non-disease areas. The distribution of disease areas is often relatively stable. A2 The severity of the disease in the disease areas varies, but the disease is also relatively stable. Disease areas are divided into severe, moderate and mild according to the disease. A3 Disease areas are contiguous, and the severe, moderate and mild disease areas are adjacent to each other. There is a gradual migration and transition phenomenon between severe, moderate, mild and non-disease areas. A4 Disease areas are distributed in rural areas. Www.bzxZ.net
A5 The environment outside the disease areas is low in selenium.
Appendix B
(Standard Appendix)
Classification of disease-affected villages (towns)
This appendix is ​​applicable to the classification of disease-affected villages (towns) during the national Keshan disease monitoring and scientific research. According to the clinical detection rate of patients of various types (including latent types), they are divided into severe, moderate and mild disease-affected villages (towns). B1 Severe disease-affected villages (towns) have a clinical detection rate of patients of various types greater than 5.0%. 2 Moderate disease-affected villages (towns): Clinical detection rate of patients of various types 3.0% ~~5.0%. B2
Mild disease-affected villages (towns): Clinical detection rate of patients of various types less than 3.0%. If the disease-affected village (town) has only latent cases, the village (town) must have a history of acute, subacute or chronic disease. 496
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