OBJECTIVE: To summarize the data about endemic fluorosis, and investigate its prevalence and the effects of prevention and cure, so as to suggest more effective measures for the prevention and cure in the future. DATA SOURCES: A computer-based online search of China National Knowledge Infrastructure (CNKI) and VIP Chinese database was undertaken to identify articles about the distribution, monitoring and effects of prevention and cure of endemic fluorosis published in Chinese from January 1995 to March 2006 by using the keywords of "endemic fluorosis, monitor". STUDY SELECTION: Literatures about endemic fluorosis, including mainly brief introduction, practice in prevention and cure, summary of meeting, etc., the repetitive studies were excluded, and only one of them published the latest was involved. DATA EXTRACTION: Totally 25 relevant literatures were collected, and 18 of them were involved, the others were excluded. DATA SYNTHESIS: The monitoring results showed that until the end of the 2004, 44.51％ of the villages, in the drinking water type disease areas with endemic fluorosis, had executed the low-fluorine treatment of water, and 194 villages had been controlled basically; In the coal pollution type disease areas, 24 villages had been controlled basically,25.42％ of the families had reformed the stoves to prevent the coal pollution. The fluorine in water and air had been obviously declined after the improvement, some place had reached the standard of government.The morbidity rate of dental fluorosis in children of 8 to 12 years old was lower than before; The improving condition was good in most disease areas, and part of them had reached the control line; Meanwhile,the problems also existed that the measures of prevention could not befulfilled completely for the short of money, and the role of decreasing fluorine could not be acted completely because of the ill-management after the changed project.CONCLUSION: After the continuous efforts for tens of years, great progress has been obtained in the prevention and cure of endemic fluorosis,and the prevalence rates of dental fluorosis and skeletal fluorosis have reduced obviously, but many problems also exist at the same time. Therefore,the prevention and cure should be reinforced to restrain its prevalence more effectively.

Objective To summarize the basic process to create epidemiological surveillance system. Methods First, make use of the system science, information science, control science and related disciplines as theory, use deductive reasoning to get the basic process of creating epidemiological surveillance system. Then, choose 50 existing epidemiological surveillance system to study, choose the characteristics of epidemiological surveillance system as the fundaction, use inductive reasoning to complete the basic process. Results The basic process of creating the epidemiological surveillance system include: system analysis, set up the logic model of the system, system design, system implementation, system evaluation, system improving. Conclusions Epidemiological surveillance system are indispensable aspects, they should be well integrated in order to ensure the effectiveness of created epidemiological surveillance system.

BACKGROUND:Data suggested that there were 24.5 million of human immunodeficiency virus (HIV) infected women in 16 countries in southern Sahara Africa.OBJECTIVE: To survey the HIV infection status among women in reproductive age in Mauritania so as to provide research direction and basic data for prevention and treatment of immunodeficiency diseases.DESIGN: Random sampling survey.SETTING: Epidemic Disease & Health Statistics Department of Radiation Medicine and Public Health College of Suzhou University;Institute of Iodin Absence of Harbin Medical University;and Public Health College and Epidemic Disease & Health Statistics Department of Harbin Medical University.PARTICIPANTS:The survey was conducted in the 14 main cities of the whole country from March to June 2001. Inclusion criteria: Women were in reproductive age, aged 15-49 years, from Mauritania; and all told the fact.Exclusion criteria: Women refused survey and not in reproductive age were excluded.Among 331 548 women,4 000-6 000 samples were surveyed and the sampling rate was 1.2％-1.8％.METHODS: Venous blood and isolated sera of women in reproductive age were collected. Sera were detected by ELISA test and confirmed by Western Blot test in order to know HIV infection and its subtypes.The detection rates of different population and cities were calculated and made statistical analysis.MAIN OUTCOME MEASURES: The infection and subtypes of HIV; infected rate of HIV among different crowd in different cities.RESULTS: Among 4 648 women in reproductive age in 13 provinces, 24infected cases aged of 15-49 years were found with the infected rate of 0.516％,of them 22 cases were infected with HIV-1 and 2 cases were in fected with HIV-2. The detection rates were 0.500％-1.010％ (5 cities), 0-0.500％ (3 cities) and 0％ (5 ities) respectively. The age of 95.83％ of the total infected cases was 15-29 years. The number of the HIV-infected cases was about 1 400 persons among women in reproductive age in 13 main cities.CONCLUSION: The total HIV-infected detection rate was 0.516％ among women in reproductive age in 13 main cities of Mauritania.HIV-1 2 was the dominant subtype. HIV infection was different among regions. HIV-in fected cases aged 15-29 constituted more than 95％ of the total cases. The prevalent trend of AIDS was in the stage of transmission after importing.

BACKGROUND: Ambient fine particle (PM METHODS: A time-stratified case-crossover design was used to analyze YLL from respiratory diseases in the elderly related to ambient PM RESULTS: Each 10 μg/m CONCLUSIONS Birth season which reflects the early-life PM
Aged ; Aged, 80 and over ; Air Pollutants/analysis* ; Cause of Death ; China/epidemiology* ; Cross-Over Studies ; Environmental Exposure/analysis* ; Humans ; Life Expectancy ; Particulate Matter/analysis* ; Respiration Disorders/mortality* ; Seasons