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ObjectiveTo analyze the prevalence of reduced visual acuity of young children in Changning district of Shanghai and to explore the influencing factors， so as to provide a reference basis for formulating prevention and control measures for children’s reduced visual acuity. MethodsVisual acuity examination and questionnaire survey were conducted on 5 772 middle class children in kindergartens and first grade children in primary schools who participated in the refractive screening in Changning District in 2019. χ2 test and logistic regression analysis were used to explore the influencing factors of reduced visual acuity. ResultsThe overall prevalence of reduced visual acuity among lower-aged children was 10.4% （596/5 772）. The prevalence of reduced visual acuity in the first grade children was 10.1% （284/2 822）， and that in the middle class children of kindergarten was 10.8% （312/2 900）. The prevalence of reduced visual acuity was 10.2% （298/2 933） in boys and 10.7% （298/2 789） in girls. 98.1% of young children had one or more bad habits when using eyes. Multivariate logistic regression analysis showed that frequent excessive head lowering （OR=1.713） and sometimes too close to the screen （OR=1.294） were independent risk factors for reduced visual acuity in young children； After stratification by age， frequent excessive head lowering （OR=1.997） increased the risk of reduced visual acuity of children in the first grade of primary school. Premature birth （OR=1.841）， sometimes excessive head lowering （OR=1.363） and frequent excessive head lowering （OR=2.002） increased the risk of reduced visual acuity of children in the middle class of kindergarten. ConclusionFor young children， we should pay more attention to their daily eye use distance， correct their bad behaviors for using eyes such as excessively lowering their head when using eyes and too close to the video screen when using electronic products， so as to prevent and delay the occurrence and development of reduced visual acuity.
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ObjectiveTo analyze the clinical and epidemiological characteristics of confirmed cases of human monkeypox infection in Changning District， Shanghai， and to explore their clinical and epidemiological characteristics. MethodsClinical data from 10 reported cases of monkeypox in individuals residing in Changning District or identified by local medical institutions between July 20 and September 30， 2023， were collected. Epidemiological case investigations were conducted， and throat swabs， anal swabs， and rash swabs were collected by the treating medical institutions. Real-time fluorescence quantitative PCR was used for monkeypox virus nucleic acid testing， and descriptive epidemiological analysis was applied to analyze the epidemiological characteristics of the cases. ResultsAll 10 confirmed cases of human monkeypox infection were all young males with an average age of 35.4 years， all of whom belonged to the men who have sex with men （MSM） population， with no occupational clustering. The primary clinical symptoms included fever， rash， enlarged inguinal lymph nodes， and muscle soreness. Nine cases presented with a rash， and seven cases experienced fever symptoms. Among the 10 cases， one experienced fever， rash， enlarged lymph nodes， and muscle soreness； two had fever， rash， and enlarged lymph nodes； two had fever， rash， and systemic soreness； two had only a rash； one had fever or rash； and one was asymptomatic. Among the nine cases with a rash， the rash was mainly localized to the genital or anal area， with fewer cases presenting rashes on the limbs or trunk simultaneously. All cases reported a history of non-exclusive MSM behavior within 21 days before the onset of the disease. The interval between the last suspected high-risk exposure and the onset of symptoms was 4 to 10 days， with an average interval of 6.9 days. The time from the onset of fever to the appearance of a rash was 0 to 5 days， with an average of 1.87 days. ConclusionThe main clinical manifestations of human infection with monkeypox are fever， rash， and enlarged inguinal lymph nodes. The MSM population is a high-risk group for monkeypox infection， and its source of infection may be associated with MSM exposure. Early-stage symptoms are mild， leading to potential underdiagnosis. Additionally， patients may conceal information during the investigation process， which increases the difficulty of epidemic prevention and control.
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ObjectiveBy using bibliometrics and scientific knowledge mapping technology， this study systematically combs and visually analyzes the research hotspots， frontiers and trends of infectious disease prevention and control in China in the past 30 years， summarizes the research direction in this field， combs the knowledge structure， and provides guidance and reference for subsequent research. MethodsThe databases of CNKI and Wanfang were searched by （"infectious diseases" or " communicable diseases"） and "prevention and control" not "chronic diseases"， The bibliometric software VOSviewer 1.68 and CiteSpace 5.8.3 were used to analyze the co-occurrence network of scientific knowledge maps from the keywords， emerging words， research authors， institutions and other aspects， and summarized the research hotspots， frontiers and trends in the field of infectious disease prevention and control in China. ResultsA total of 10 777 literatures were retrieved， and 7 676 literatures were included after screening. From the perspective of research trend， the number of published literatures in the field of infectious disease prevention and control in China showed an overall upward trend， and the number of studies was closely related to the outbreak of infectious diseases. The Chinese Center for Disease Control and Prevention has played a leading role in the research. In terms of researchers' cooperation， Hao Mo， Li Chengyue， Wang Ying and others from Fudan University were the main researchers' cooperation teams. Tu Wenxiao， Meng Ling and Xiang Nijuan from the Chinese Center for Disease Control and Prevention were the main researchers. Wang Quanyi， Li Xinyu， Wang Xiaoli from the Beijing Center for Disease Control and Prevention were the main researchers' research teams. Yang Zhicong， Li Meixia， Luo Lei and other research teams from Guangzhou Center for Disease Control and Prevention have formed a relatively obvious cooperation network. Analysis of the keyword cluster atlas showed that the articles related to the prevention and control of infectious diseases mainly were focused on the epidemiology of new coronavirus infection （new infectious diseases）， school infectious diseases， common infectious diseases， and the related research of vector infectious diseases. The analysis of salient words indicated the research focus and trend change in different time periods. At present， the research focus and frontier in the field of infectious diseases are mainly concentrated in the field of prevention and control of new infectious diseases， such as the monitoring， early warning， reporting， emergency management， laws and regulations of the new coronavirus infection. ConclusionOur country attaches great importance to the prevention and control of infectious diseases， with extensive and in-depth research hotspots. In particular， research on emerging infectious diseases has developed rapidly and achieved remarkable results. With the application of molecular biology， big data， AI and other technologies in the field of infectious disease prevention and control， China's infectious disease prevention and control capabilities will be greatly improved. At the same time， it is necessary to strengthen the linkage between universities， disease control institutions， and medical institutions， and establish and improve a long-term normal prevention and control mechanism.
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ObjectiveTo evaluate the caries prevention effect of different fluoride application frequencies in 3-year-old children with active caries. MethodsA total of 337 3-year-old children with dental caries from 12 kindergartens in Changning District of Shanghai were divided into three groups： group 1 received fluoride application once every three months， group 2 received fluoride application once every six months， and the control group received no fluoride application. At baseline， parents completed a questionnaire survey， and oral examinations were conducted at baseline， 7 months， and 16 months after the fluoride intervention to assess the incidence of new dental caries， new dmft， and new dmfs of children. Multivariate logistic regression analysis was used to analyze the relationship between fluoride application and new dental caries， with new dental caries as the dependent variable and local fluoride application， child's gender， age in months， parents' highest education level， frequency of sugary intake （desserts， candies， sweet beverages）， age of toothbrushing initiation， frequency of daily toothbrushing， use of fluoride toothpaste， parental assistance in child’s toothbrushing， and daily use of dental floss as the independent variables. ResultsThere were no significant differences in baseline general conditions and oral health behaviors among group 1 （121 cases）， group 2 （123 cases） and the control group （93 cases） （all P>0.05）. After 16 months' intervention， three children were lost to follow-up due to transferring schools. The new caries rates of group 1 （120 cases）， group 2 （121 cases） and the control group （93 cases） were 5.83%， 24.79% and 52.69%， respectively. The incidence of new caries was significantly lower in group 1 compared to group 2 and the control group （P<0.001）， and it was also significantly lower in group 2 compared to the control group （P<0.001）. The newly-increased caries of group 1， group 2 and the non-fluoride control group were all 0.12 0.52， 0.36 0.68 and 1.16 1.39， respectively. The mean increment of new caries was lower in group 1 compared to group 2 （P=0.040） and the non-fluoride control group （P<0.001）， and it was lower in group 2 compared to the non-fluoride control group （P<0.001）. After adjusting for factors such as gender， parents' education level and child's oral health behaviors by multivariate logistic regression， the results showed that fluoride application once every three months could significantly reduce the risk of dental caries （OR=0.04， P<0.001）. ConclusionLocal use of fluoride has a certain effect on the prevention and treatment of dental caries in children with active caries. Fluoride application once every three months effectively reduces the incidence of new caries and slows down the progression of caries lesions. It is suggested that local application of fluoride should be implemented once every three months for children with active caries.