Long-term exposure to PM and its constituents and visual impairment in schoolchildren: A population-based survey in Guangdong province, China.

Background: Exposure to fine particulate matter (PM) has been linked to visual impairment. Nevertheless, evidence associating PM constituents with visual impairment in schoolchildren is sparse.

Objectives: To explore the effects of long-term exposure to PM and its constituents on visual impairment.

Prevalence and related factors of depression and falls among the elderly living in rural communities of Guangzhou.

Few studies have concentrated on the prevalence and related factors of depression and falls among the elderly living in rural communities of Guangzhou. A total of 335 participants aged ≥60 years were recruited by simple random sampling method. A structural equation model was applied to determine interrelationships between depression, falls and other variables.

Ambient air pollution and depression: A systematic review with meta-analysis up to 2019.

Although epidemiological studies have evaluated the associations of ambient air pollution with depression, the results remained mixed. To clarify the nature of the association, we performed a comprehensive systematic review and meta-analysis with the Inverse Variance Heterogeneity (IVhet) model to estimate the effect of ambient air pollution on depression. Three English and four Chinese databases were searched for epidemiologic studies investigating associations of ambient particulate (diameter ≤ 2.

Incidence trends and age distribution of colorectal cancer by subsite in Guangzhou, 2000-2011.

Introduction: Colorectal cancer (CRC) is the third most common cancer in China. The incidence of CRC has been increasing in recent years. The aim of this study was to explore the incidence trends and the age distribution of CRC by subsite in Guangzhou between 2000 and 2011.

The Impacts of Mosquito Density and Meteorological Factors on Dengue Fever Epidemics in Guangzhou, China, 2006-2014: a Time-series Analysis.

Objective: To explore the associations between the monthly number of dengue fever(DF) cases and possible risk factors in Guangzhou, a subtropical city of China.

Methods: The monthly number of DF cases, Breteau Index (BI), and meteorological measures during 2006-2014 recorded in Guangzhou, China, were assessed. A negative binomial regression model was used to evaluate the relationships between BI, meteorological factors, and the monthly number of DF cases.

Time trends of nasopharyngeal carcinoma in urban Guangzhou over a 12-year period (2000-2011): declines in both incidence and mortality.

Nasopharyngeal carcinoma (NPC) is an uncommon disease in most countries but occurs with much greater frequency in southern China. This study aimed to examine the secular trends of NPC in urban Guangzhou over the time period of 2000-2011 using data from the Guangzhou Cancer Registry. Age-adjusted annual incidence rates of NPC were calculated by the direct method using the WHO World Standard Population (1960) as the reference.

Effects of doctor-patient communication on quality of life among breast cancer patients in southern China.

Objective: This study aimed to determine effects of doctor-patient communication on the quality of life among breast cancer survivors in 16 communities in southern China.

Methods: Multistage random sampling was to use to recruit 260 females from the Guangzhou Cancer Registry Database who were diagnosed with breast cancer. A questionnaire provided data on the doctor-patient communication (including the doctor's attitude, the patient's participation with the medical decision and information about the disease) and QOL (quality of life), as measured using FACT-B.

Impact of heat wave in 2005 on mortality in Guangzhou, China.

Objective: To assess the impact of the heat wave in 2005 on mortality among the residents in Guangzhou and to identify susceptible subpopulations in Guangzhou, China.

Methods: The data of daily number of deaths and meteorological measures from 2003 to 2006 in Guangzhou were used in this study. Heat wave was defined as ⋝7 consecutive days with daily maximum temperature above 35.

[A norovirus-borne outbreak caused by contaminated bottled spring water in a school, Zhejiang province].

Objective: To study a local hospital reported acute gastroenteritis in a boarding school on its source of infection, mode of transmission and risk factors of the infection.

Methods: A suspected case was defined as who had developed diarrhea (≥ 3 times/day) or vomiting among teachers or students of the school, during April 19 - 30, 2010. A confirmed case was from a probable case plus tested positive for norovirus in stool specimens by using RT-PCR.

[An outbreak of measles among unvaccinated migrant population in Zhejiang province, from June to August, 2010].

Objective: On July 6, 2010, the parents of a patient with confirmed measles reported several suspected measles patients with fever and rash in their village. An investigation was carried out to verify and understand the cause of the outbreak.

Methods: Several suspected cases had an onset of fever and rash in this and other neighboring villages during June 1 to August 3, 2010.

[Investigation on a seasonal influenza accompanying with the first locale novel A/H1N1 influenza outbreak in China].

Objective: To timely summarize past experience and to provide more pertinent reference for control and prevention in A/H1N1 cases in influenza season.

Methods: During May 25 to 31, 2009, 2 secondary community cases caused by a influenza A/H1N1 imported case. In the close contacts of 3 A/H1N1 cases, 14 had some aspirator symptoms onset, such as fever (> or = 37.

[Epidemiological characteristic of first case of locally identified A/H1N1 secondary cases caused by imported source of infection in China].

Objective: To study the first locally identifed A/H1N1 secondary cases outbreak in China.

Methods: Interview and field investigation were integrated to describe the whole process of transmission on each case and to illustrate the relationships between the onset of the disease and the retated factors.

Results: Two contact persons appearanced fever and whose throat swabs were tested positive to H1N1 viral nucleic acid.

[Application of pulse-field gel electrophoresis analysis in the source-tracking of cholera epidemics].

Objective: To apply pulse-field gel electrophoresis analysis(PFGE) in the analysis of cholera outbreak events and to determine the molecular epidemiological characteristics of Vibrio cholerae ( V. cholerae) isolates.

Methods: PFGE using restriction enzyme Not I was employed in the molecular subtyping of forty-one strains of V.

[Analysis of characteristics of major pathogenicity-related genes of Vibrio cholerae isolated in Guangzhou area from 2001 to 2005].

Objective: To apply multiplex polymerase chain reaction (MPCR) assay and sequencing in study of the carrying status of four pathogenicity-related genes of Vibrio cholerae (V.cholerae) and the variation of ctxA.

Methods: Primers targeting cholera toxin sub-unit A gene (ctxA), toxin-coregulated pilus gene (tcpA), accessory cholera enterotoxin gene (ace), zonula occludens toxin gene (zot) were designed and the MPCR method was applied to detect the pathogenicity-related genes of 276 strains of V.