scholarly journals Virome in adult Aedes albopictus captured during different seasons in Guangzhou City, China

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Wenqiao He ◽  
Yanxia Chen ◽  
Xiru Zhang ◽  
Mingji Peng ◽  
Da Xu ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Rural Areas ◽  
Disease Transmission ◽  
Urban Areas ◽  
Control Measures ◽  
Health System Strengthening ◽  
Female Mosquito ◽  
Hbv Genotype ◽  
Guangzhou City ◽  
Different Seasons

Abstract Background The mosquito Aedes albopictus is an important vector for many pathogens. Understanding the virome in Ae. albopictus is critical for assessing the risk of disease transmission, implementation of vector control measures, and health system strengthening. Methods In this study, viral metagenomic and PCR methods were used to reveal the virome in adult Ae. albopictus captured in different areas and during different seasons in Guangzhou, China. Results The viral composition of adult Ae. albopictus varied mainly between seasons. Over 50 viral families were found, which were specific to vertebrates, invertebrates, plants, fungi, bacteria, and protozoa. In rural areas, Siphoviridae (6.5%) was the most common viral family harbored by mosquitoes captured during winter and spring, while Luteoviridae (1.1%) was the most common viral family harbored by mosquitoes captured during summer and autumn. Myoviridae (7.0% and 1.3%) was the most common viral family in mosquitoes captured in urban areas during all seasons. Hepatitis B virus (HBV) was detected by PCR in a female mosquito pool. The first near full-length HBV genome from Ae. albopictus was amplified, which showed a high level of similarity with human HBV genotype B sequences. Human parechovirus (HPeV) was detected in male and female mosquito pools, and the sequences were clustered with HPeV 1 and 3 sequences. Conclusions Large numbers of viral species were found in adult Ae. albopictus, including viruses from vertebrates, insects, and plants. The viral composition in Ae. albopictus mainly varied between seasons. Herein, we are the first to report the detection of HPeV and HBV in mosquitoes. This study not only provides valuable information for the control and prevention of mosquito-borne diseases, but it also demonstrates the feasibility of xenosurveillance. Graphical Abstract

scholarly journals Biting rhythm, fecundity and longevity rate of Aedes albopictus (Skuse) females from different urbanized settings in Penang Island, Malaysia under uncontrolled laboratory conditions

2019 ◽  
Author(s):  
Nor Atikah Farhah Muhammad ◽  
Nur Faeza Abu Kassim ◽  
Abdul Hafiz Ab Majid ◽  
Hamady Dieng ◽  
Silas Wintuma Avicor
Keyword(s):  
Aedes Albopictus ◽  
Standard Error ◽  
Rural Areas ◽  
Disease Transmission ◽  
Urban Areas ◽  
Environmental Changes ◽  
Control Program ◽  
Laboratory Strain ◽  
Adult Survival ◽  
Fecundity Rate

AbstractUrbanization could potentially modify Aedes albopictus’ ecology by changing the dynamics of the species, and increasing the abundance of their breeding sites due to environmental changes, and thus contribute to dengue outbreaks. An efficient control of the vector requires a deeper understanding on the biological components of this vector. Thus, this study was conducted to evaluate the biting rhythm, fecundity and longevity rate of Ae. albopictus in relation to urbanization strata; urban, suburban and rural areas in Penang Island, Malaysia. The experiments were done in comparison to a laboratory strain. Twenty-four hours biting activity of all the mosquito strains showed a clear bimodal biting activity, with morning and evening twilight peaks. A two-way analysis of variance (ANOVA) found that there was statistically no significant interaction (F(69,192) = 1.337, P > 0.05) between the effects of biting time and mosquito strains. Meanwhile, fecundity rates were shown to be statistically significantly different between mosquito strains (F(3,442) = 10.559, P < 0.05) with urban areas having higher mean number of eggs (mean = 107.69, standard error = 3.98) than suburban (mean = 94.48, standard error = 5.18), and rural areas (mean = 72.52, standard error = 3.87). Longevity rates were significantly higher (F(3,441) = 31.259, P < 0.05) for mosquito strains from urban areas compared to the other strains. These findings would provide crucial and relevant fundamental information to the planning of control program in Malaysia, particularly Penang.Author SummaryAedes mosquito populations associated with human habitation in urban area do not only have the potential to cause biting nuisance, but also cause significant public health risks through the transmission of dengue virus. The socioeconomic effects of urbanization have been comprehensively studied by socio-ecologists, but the ecological effects and their impact on this vector biology was not known. The authors found that in Penang Island, the mean number of eggs laid per female of Aedes albopictus is high in the urban areas than those in suburban and rural areas. The survivorship is high for urban populations parallel to the fecundity rate and apparent biting pattern which is peak at dawn and dusk was noted for all Ae. albopictus strains. The changed environment in the urbanized area where more kinds of breeding containers and more blood sources produced by condensed human population supported by warm climate may facilitate larval development, enhance the vector survivorship and its reproductive fitness. These might be the reasons for quick adaptation and susceptibility of Ae. albopictus in urban areas. As higher fecundity rate and longer adult survival may enhance disease transmission, this species studied is indeed need high attention in terms of vector control.

scholarly journals Evaluation of Community Resilience in Rural China—Taking Licheng Subdistrict, Guangzhou as an Example

2021 ◽  
Vol 18 (11) ◽  
pp. 5827
Author(s):  
Jianhong Fan ◽  
You Mo ◽  
Yunnan Cai ◽  
Yabo Zhao ◽  
Dongchen Su
Keyword(s):  
Spatial Distribution ◽  
Rural Communities ◽  
Rural Areas ◽  
Urban Areas ◽  
Rural China ◽  
Social Resilience ◽  
Learning Abilities ◽  
The Sustainable Development ◽  
Guangzhou City ◽  
Local Sustainability

Resilience of rural communities is becoming increasingly important to contemporary society. In this study we used a quantitative method to measure the resilience regulating ability of rural communities close to urban areas—in Licheng Subdistrict, Guangzhou City, China. The main results are as follows: (1) Rural systems close to urban areas display superior adapting and learning abilities and have a stronger overall resilience strength, the spatial distribution of which is characterized by dispersion in whole and aggregation in part; (2) the resilience of most rural economic subsystems can reach moderate or higher levels with apparent spatial agglomeration, whilst the ecological subsystem resilience and social resilience are generally weaker; the spatial distribution of the former shows a greater regional difference while the latter is in a layered layout; (3) some strategies such as rebuilding a stable ecological pattern, making use of urban resources and cultivating rural subjectivity are proposed on this basis, in order to promote the sustainable development of rural areas and realize rural revitalization. This work also gives suggestion for the creation of appropriate and effective resilience standards specifically targeted for rural community-aiming to achieve the delivery of local sustainability goals.

scholarly journals Prevalence and access to care for cardiovascular risk factors in older people in Sierra Leone: a cross-sectional survey

BMJ Open ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. e038520
Author(s):  
Maria Lisa Odland ◽  
Tahir Bockarie ◽  
Haja Wurie ◽  
Rashid Ansumana ◽  
Joseph Lamin ◽  
...  
Keyword(s):  
Risk Factors ◽  
Access To Care ◽  
Sierra Leone ◽  
Low Income ◽  
Rural Areas ◽  
Urban Areas ◽  
Disease Risk ◽  
Cardiovascular Disease Risk ◽  
Health System Strengthening ◽  
Low Income Countries

IntroductionPrevalence of cardiovascular disease risk factors (CVDRFs) is increasing, especially in low-income countries. In Sierra Leone, there is limited empirical data on the prevalence of CVDRFs, and there are no previous studies on the access to care for these conditions.MethodsThis study in rural and urban Sierra Leone collected demographic, anthropometric measurements and clinical data from randomly sampled individuals over 40 years old using a household survey. We describe the prevalence of the following risk factors: diabetes, hypertension, dyslipidaemia, overweight or obesity, smoking and having at least one of these risk factors. Cascades of care were constructed for diabetes and hypertension using % of the population with the disease who had previously been tested (‘screened’), knew of their condition (‘diagnosed’), were on treatment (‘treated’) or were controlled to target (‘controlled’). Multivariable regression was used to test associations between prevalence of CVDRFs and progress through the cascade for hypertension with demographic and socioeconomic variables. In those with recognised disease who did not seek care, reasons for not accessing care were recorded.ResultsOf 2071 people, 49.6% (95% CI 49.3% to 50.0%) of the population had hypertension, 3.5% (3.4% to 3.6%) had diabetes, 6.7% (6.5% to 7.0%) had dyslipidaemia, 25.6% (25.4% to 25.9%) smoked and 26.5% (26.3% to 26.8%) were overweight/obese; a total of 77.1% (76.6% to 77.5%) had at least one CVDRF. People in urban areas were more likely to have diabetes and be overweight than those living in rural areas. Moreover, being female, more educated or wealthier increased the risk of having all CVDRFs except for smoking. There is a substantial loss of patients at each step of the care cascade for both diabetes and hypertension, with less than 10% of the total population with the conditions being screened, diagnosed, treated and controlled. The most common reasons for not seeking care were lack of knowledge and cost.ConclusionsIn Sierra Leone, CVDRFs are prevalent and access to care is low. Health system strengthening with a focus on increased access to quality care for CVDRFs is urgently needed.

scholarly journals Socioeconomic Determinants of Malaria in Selected Urban and Rural Areas in Anambra State, Nigeria

2020 ◽  
pp. 53-64
Author(s):  
C. C. Nduka ◽  
H. N. Chineke ◽  
P. O. Adogu ◽  
A. F. Chizoba
Keyword(s):  
Socioeconomic Factors ◽  
Rural Areas ◽  
Urban Areas ◽  
Control Measures ◽  
Health Concern ◽  
Skilled Workers ◽  
Quality Health Care ◽  
Cross Sectional ◽  
Rural And Urban Areas ◽  
Rural And Urban

Malaria, a disease of poverty, is of significant public health concern. It is endemic in Nigeria with the risk of transmission appearing to be high because of favorable climatic and environmental factors. Increased susceptibility to malaria has also been linked to dirty surroundings that favor the breeding and propagation of the vector, poor access to quality health care and ignorance especially of malaria prevention strategies. However, this study investigated the role of socioeconomic factors responsible for the observed difference in malaria prevalence between selected rural and urban areas of Anambra, Nigeria. A descriptive comparative cross-sectional study, data on demographic and socioeconomic variables were collected from 202 urban and rural respondents, then analyzed using SPSS platform to generate chi-square test of significance. The results were presented in figures, table and charts for clarity. All the subjects were aware of the term malaria but only 63.4% had adequate specific knowledge of malaria. Generally, 25.7% of rural participants had no formal education while the urban group had only 4% of that particular category. About 52.5% of rural participants earned below 50,000 naira monthly, with 14.9% earning above 100,000 naira while the reverse was the case in the urban area. Also, the number of malaria episodes was inversely proportional to the household monthly income (X2=24.30, p<0.001). More episodes of malaria were also reported among the unskilled workers and skilled workers (71.3%) compared to Professionals (28.7%), yet all the participants reported the presence of a healthcare facility <3km from their houses with 95% and 80.2% of them in the rural and urban areas respectively having to pay out-of-pocket for healthcare services. It is clear that socioeconomic factors play a role in the persistence of malaria as an endemic disease in Nigeria. Therefore, existing control measures should incorporate strategies to end poverty and ignorance especially among the rural populace.

scholarly journals Examining the Role of Health Facilities in Supporting Iron Folic Acid Supplementation Adherence Among Women in Malawi (OR25-03-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Rukundo Benedict ◽  
Wenjuan Wang ◽  
Lindsay Mallick
Keyword(s):  
Folic Acid ◽  
Side Effects ◽  
Rural Areas ◽  
Urban Areas ◽  
Public Health Problem ◽  
Health Facilities ◽  
Health System Strengthening ◽  
Gps Data ◽  
Major Public Health Problem ◽  
Iron Folic Acid

Abstract Objectives Maternal anemia is a major public health problem in many low and middle income countries. In Malawi, consumption of iron folic acid supplements (IFA) has remained low and unchanged since 2004, even with the support of national policy and programs. To understand program implementation challenges, our study examined the relationship between the IFA-related health service environment (HSE) during antenatal care (ANC) and women's adherence to IFA supplementation guidelines. Methods Data from the 2015–16 Malawi Demographic and Health Survey (DHS) and the 2013–14 Malawi Service Provision Assessment (SPA), both of which collect GPS data of clusters or health facilities, were used. Each DHS cluster was linked to SPA facilities within a specified buffer distance (5 km for urban and 10 km for rural) using GPS data. IFA-related HSE was defined as availability of IFA, observed prescription of IFA, and observed counseling on IFA in health facilities within the buffer. The HSE variables were aggregated to the cluster-level and classified as low, medium, or high. Multilevel logistic regressions, stratified by urban and rural locale, were used to model associations between consumption of IFA and HSE variables controlling for individual-level factors. Results In Malawi 44% of women in urban and 32% in rural areas reported IFA consumption for at least 90 days during their most recent pregnancy. IFA supplements were available in the majority of health facilities (94%) providing ANC. Among clients, 85% received IFA or were given a prescription, 59% were counseled on how to use IFA, and 3% were counseled on side effects. In rural areas, regression models showed that high levels of IFA availability in facilities (OR = 2.07; 95% CI: 1.13–3.80) and IFA counseling (OR = 1.42; 95% CI: 1.12–1.78) were associated with IFA consumption. No associations with any HSE variables were observed in urban areas. Conclusions Despite widespread availability and prescription of IFA supplements from health facilities, receipt of counseling was low, particularly for side effects. Findings in rural areas reinforce the importance of health system strengthening to ensure IFA availability and counseling to support IFA consumption during pregnancy. Further research is warranted to investigate factors that affect IFA consumption in urban areas. Funding Sources United States Agency for International Development (USAID) through the DHS Program (7200AA18C00083).

scholarly journals Epidemiological study of scarlet fever in Shenyang, China

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Huijie Chen ◽  
Ye Chen ◽  
Baijun Sun ◽  
Lihai Wen ◽  
Xiangdong An
Keyword(s):  
Rural Areas ◽  
Scarlet Fever ◽  
Urban Areas ◽  
Primary Schools ◽  
Prevention And Control ◽  
Hot Spot ◽  
Temporal Distribution ◽  
Control Measures ◽  
And Control ◽  
Epidemiological Characteristics

Abstract Background Since 2011, there has been an increase in the incidence of scarlet fever across China. The main objective of this study was to depict the spatiotemporal epidemiological characteristics of the incidence of scarlet fever in Shenyang, China, in 2018 so as to provide the scientific basis for effective strategies of scarlet control and prevention. Methods Excel 2010 was used to demonstrate the temporal distribution at the month level and ArcGIS10.3 was used to demonstrate the spatial distribution at the district/county level. Moran’s autocorrelation coefficient was used to examine the spatial autocorrelation and the Getis-Ord statistic was used to determine the hot-spot areas of scarlet fever. Results A total of 2314 scarlet fever cases were reported in Shenyang in 2018 with an annual incidence of 31.24 per 100,000. The incidence among males was higher than that among females(p<0.001). A vast majority of the cases (96.89%) were among children aged 3 to 11 years. The highest incidence was 625.34/100,000 in children aged 5–9 years. In 2018 there were two seasonal peaks of scarlet fever in June (summer-peak) and December (winter-peak). The incidence of scarlet fever in urban areas was significantly higher than that in rural areas(p<0.001). The incidence of scarlet fever was randomly distributed in Shenyang. There are hotspot areas located in seven districts. Conclusions Urban areas are the hot spots of scarlet fever and joint prevention and control measures between districts should be applied. Children aged 3–11 are the main source of scarlet fever and therefore the introduction of prevention and control into kindergarten and primary schools may be key to the control of scarlet fever epidemics.

Trends and Distribution in Mortality Rates of Coronary Heart Disease in Hexi Corridor of Gansu in China from 2006 to 2015

2019 ◽  
Author(s):  
xinghui li ◽  
xiaolan ren ◽  
yan qiao ◽  
ping xie ◽  
nan wang ◽  
...  
Keyword(s):  
Coronary Heart Disease ◽  
Heart Disease ◽  
Mortality Rate ◽  
Rural Areas ◽  
Urban Areas ◽  
Hexi Corridor ◽  
Gansu Province ◽  
Control Measures ◽  
Urban Rural ◽  
Small Change

Abstract Background: The mortality rate of coronary heart disease (CHD) in China is different from region to region, and there are sex, age and urban-rural differences. This study described trend and distribution of CHD in Hexi corridor of Gansu province from 2006 to 2015. Method: The death data of CHD were obtained using the Death Reporting System of Gansu CDC for 2006-2015. The trend of the death cases of CHD by year, month and its distribution by sex, age and region were studied, and the changing characteristics of epidemiology was analyzed. Results: Overall, The mortality rate of CHD in Hexi corridor showed a decline trend from 2006 to 2015, a tendency that higher in winter and spring, and lowest in summer. The relative mortality of males was higher than that of females ( P < 0.05), increased with age ( P < 0.05), and that of rural areas was higher than that of urban areas ( P < 0.05). The trend analysis of death rate for ten-year showed a marked decline in females, an increase in 18-39 years old, a small change in 40-59 years old, a decrease in over 60 years old, and a downward tendency of urban areas. Further analysis showed that the mortality rate of males were higher than that of females in 18-39 years old and 40-59 years old group and also in urban areas group ( P < 0.05), while no sex difference in over 60 years old group and rural areas group ( P > 0.05). Conclusion: The mortality of CHD in Hexi corridor of Gansu province in China was lower than the national average from 2006 to 2015, but increased gradually in specified population such as in males, young and middle-age, rural areas groups. The prevention and control measures should be strengthened in these special populations.

Spatiotemporal spread of chikungunya virus in Sarawak, Malaysia

2021 ◽  
Author(s):  
Sarat Dass ◽  
Romano Ngui ◽  
Balvinder Singh Gill ◽  
Yoke Fun Chan ◽  
Wan Yusoff Wan Sulaiman ◽  
...  
Keyword(s):  
Spatial Data ◽  
Rural Areas ◽  
Urban Areas ◽  
Chikungunya Virus ◽  
Reproduction Number ◽  
Control Measures ◽  
River Networks ◽  
Scan Statistic ◽  
R Software ◽  
Time Scan

Abstract Background We studied the spatiotemporal spread of a chikungunya virus (CHIKV) outbreak in Sarawak state, Malaysia, during 2009–2010. Methods The residential addresses of 3054 notified CHIKV cases in 2009–2010 were georeferenced onto a base map of Sarawak with spatial data of rivers and roads using R software. The spatiotemporal spread was determined and clusters were detected using the space-time scan statistic with SaTScan. Results Overall CHIKV incidence was 127 per 100 000 population (range, 0–1125 within districts). The average speed of spread was 70.1 km/wk, with a peak of 228 cases/wk and the basic reproduction number (R0) was 3.1. The highest age-specific incidence rate was 228 per 100 000 in adults aged 50–54 y. Significantly more cases (79.4%) lived in rural areas compared with the general population (46.2%, p&lt;0.0001). Five CHIKV clusters were detected. Likely spread was mostly by road, but a fifth of rural cases were spread by river travel. Conclusions CHIKV initially spread quickly in rural areas mainly via roads, with lesser involvement of urban areas. Delayed spread occurred via river networks to more isolated areas in the rural interior. Understanding the patterns and timings of arboviral outbreak spread may allow targeted vector control measures at key transport hubs or in large transport vehicles.

scholarly journals Clinico- Serological Profile and Geographical Distribution of Dengue Fever from a Tertiary Care Hospital, South India

2021 ◽  
Author(s):  
Morubagal Raghavendra Rao ◽  
Rashmi Padmanabha Mahale ◽  
Sowmya Shivappa ◽  
Vidyavathi B. Chitharagi ◽  
Ranjitha S. Gowda ◽  
...  
Keyword(s):  
Dengue Fever ◽  
Geographical Distribution ◽  
Urban Areas ◽  
Tertiary Care ◽  
Control Measures ◽  
Care Hospital ◽  
Ns1 Antigen ◽  
Different Seasons ◽  
The Common ◽  
Geographical Maps

Dengue fever is one of the common viral illnesses linked with significant morbidity and mortality. Of late, there is rapid increase in dengue cases in India. The present study aimed to known dengue seropositivity in different seasons of a year, other laboratory parameters and its geographical distribution. During the study period of 15 months 4172 patients hospitalized with probable dengue fever were included. Dengue serology was done for all cases by ELISA(J. Mitra & Co). Demographic details were taken to create geographical maps of the disease. Of the 4172 suspected dengue cases, 817 had confirmed dengue illness. Of these 817 cases, 584 showed Ns1 antigen (71.4%), 150 IgM antibody (18.3%), and 38 had both Ns1 and Ig M (4.6%). Platelet count less than 1,00,000 were seen in 566 (69.27%) patients. Dengue was noticeably more during monsoon time (June to September) of a year. Through geographical maps major clusters were noticed urban areas of Mysuru and Krishnaraja Nagara , while few clusters were also observed in Periyapatna and T Narsipura taluks of Mysuru district. To minimize the load of dengue cases and its death rate better community awareness and vector control measures need to be strengthened during monsoon especially in areas where burden of the disease is more. This study helps in early preparedness of the authorities concerned in controlling possible epidemics in future.

scholarly journals Epidemiological study of scarlet fever in Shenyang , China

2019 ◽  
Author(s):  
Huijie Chen ◽  
Ye Chen ◽  
Baijun Sun ◽  
Lihai Wen ◽  
Xiangdong An
Keyword(s):  
Rural Areas ◽  
Scarlet Fever ◽  
Urban Areas ◽  
Primary Schools ◽  
Prevention And Control ◽  
Hot Spot ◽  
Temporal Distribution ◽  
Control Measures ◽  
And Control ◽  
Epidemiological Characteristics

Abstract Background: Since 2011, there has been an increase in the incidence of scarlet fever across China. The main objective of this study was to depict the spatiotemporal epidemiological characteristics of the incidence of scarlet fever in Shenyang, China, in 2018 so as to provide the scientific basis for effective strategies of scarlet control and prevention. Methods: Excel 2010 was used to demonstrate the temporal distribution at the month level and ArcGIS10.3 was used to demonstrate the spatial distribution at the district/county level. Moran’s autocorrelation coefficient was used to examine the spatial autocorrelation and the Getis-Ord statistic was used to determine the hot-spot areas of scarlet fever. Results: A total of 2,314 scarlet fever cases were reported in Shenyang in 2018 with an annual incidence of 31.24 per 100,000. The incidence among males was higher than that among females（p＜0.001). A vast majority of the cases (96.89%) were among children aged 3 to 11 years. The highest incidence was 625.34/100,000 in children aged 5-9 years. In 2018 there were two seasonal peaks of scarlet fever in June (summer-peak) and December (winter-peak).The incidence of scarlet fever in urban areas was significantly higher than that in rural areas(p＜0.001).The incidence of scarlet fever was randomly distributed in Shenyang. There are hotspot areas located in seven districts. Conclusions: Urban areas are the hot spots of scarlet fever and joint prevention and control measures between districts should be applied. Children aged 3-11 are the main source of scarlet fever and therefore the introduction of prevention and control into kindergarten and primary schools may be key to the control of scarlet fever epidemics.

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