scholarly journals Comparative analyses on epidemiological characteristics of dengue fever in Guangdong and Yunnan, China, 2004-2018

2019 ◽  
Author(s):  
Yujuan Yue ◽  
Qiyong Liu ◽  
Xiaobo Liu ◽  
Haixia Wu
Keyword(s):  
Dengue Fever ◽  
Mainland China ◽  
Temporal Analysis ◽  
Control Measures ◽  
Pearl River Delta Region ◽  
Peak Period ◽  
Guangzhou City ◽  
Male Predominance ◽  
Imported Cases ◽  
Epidemiological Characteristics

Abstract Dengue fever occurred most severely in Guangdong and Yunnan, accounting for 93.7% of indigenous cases and 65.9 % of imported cases in mainland China. Epidemiological and spatial-temporal analysis methods were used to compare epidemiological characteristics of dengue cases in Guangdong and Yunnan, China, 2004-2018, including time-series, spatial and crowd features. Much more indigenous cases were widely distributed in Guangdong, while imported cases were more common in Yunnan. 55,970 and 5,938 indigenous cases occurred in 108 counties, Guangdong and 25 counties, Yunnan. 1,146 and 3,050 imported cases occurred in 84 counties, Guangdong and 72 counties, Yunnan. There existed similar seasonal characteristics from July to November for indigenous cases, but there was a longer peak period for imported cases in Guangdong (May to December) than that in Yunnan (July to December). There existed clustering characteristics for dengue fever. 85.1% of indigenous cases in Yunnan were located in Ruili City and Jinghong City along the southwestern border. Most dengue cases in Guangdong occurred in the Pearl River Delta region, especially with more than 70.0% in Guangzhou City. 93.9% of imported cases in Guangdong and Yunna were from 9 countries of Southeast Asia. Thailand, Cambodia and Malaysia were the main imported origins in Guangdong. Myanmar and Laos were the main imported origins in Yunnan. There was a strong male predominance among imported cases and an almost equal gender distribution for indigenous cases. Most dengue cases were from individuals in 21-50 years old, with 57.3% and 62.8% for indigenous cases and 83.2% and 62.6% for imported cases in Guangdong and Yunnan, respectively. There existed differences in main occupation compositions of dengue cases. However, there were similar major occupations as housework or unemployment, retiree and businessman for indigenous cases, and similar major occupation as businessman for imported cases. Farmers accounted for a larger proportion of dengue cases in Yunnan. The findings of epidemiological characteristics and differences of dengue fever in Guangdong and Yunnan are helpful to formulate targeted, strategic plans and implement effective public health prevention and control measures in China.

scholarly journals Comparative analyses on epidemiological characteristics of dengue fever in Guangdong and Yunnan, China, 2004-2018

2020 ◽  
Author(s):  
Yujuan Yue ◽  
Qiyong Liu ◽  
Xiaobo Liu ◽  
Haixia Wu
Keyword(s):  
Dengue Fever ◽  
Mainland China ◽  
Temporal Analysis ◽  
Prevention Measures ◽  
Pearl River Delta Region ◽  
Peak Period ◽  
Guangzhou City ◽  
Male Predominance ◽  
Imported Cases ◽  
Epidemiological Characteristics

Abstract Background Guangdong and Yunnan were the two provinces with the toughest dengue epidemic in China. It was to compare epidemiological characteristics of dengue fever there, 2004-2018. Methods Epidemiological method and spatial-temporal analysis were used to explore time-series, spatial and demographic features of dengue fever.Results 93.7% of indigenous cases and 65.9 % of imported cases in mainland China, 2004-2018 occurred in Guangdong and Yunnan. 55,970 and 5,938 indigenous cases occurred in 108 counties of Guangdong and 8 counties of Yunnan, respectively. 1,146 and 3,050 imported cases occurred in 84 counties of Guangdong and 72 counties of Yunnan, respectively. Guangdong and Yunnan had similar seasonal characteristics for dengue fever, and Guangdong had a longer peak period. 85.1% of indigenous cases in Yunnan were located in Ruili City and Jinghong City along the southwestern border. Most dengue cases in Guangdong occurred in the Pearl River Delta region, and especially more than 70.0% of dengue cases in Guangdong occurred in Guangzhou City. 93.9% of imported cases in Guangdong and Yunnan were imported from 9 countries of Southeast Asia. Thailand, Cambodia and Malaysia were the main imported origins in Guangdong. Myanmar and Laos were the main imported origins in Yunnan. There was a strong male predominance among imported cases and an almost equal gender distribution among indigenous cases. Most dengue cases were from individuals in 21-50 years old, accounting for 57.3% and 62.8% of indigenous cases and 83.2% and 62.6% of imported cases in Guangdong and Yunnan, respectively. There were similar major occupations as housework or unemployment, retiree and businessman for indigenous cases, and businessman for imported cases. However, farmers accounted for a larger proportion of dengue cases in Yunnan.Conclusions The findings of epidemiological characteristics and differences of dengue fever in Guangdong and Yunnan are helpful to formulate targeted, strategic plans and implement effective public health prevention measures in China.

scholarly journals Comparative analyses on epidemiological characteristics of dengue fever in Guangdong and Yunnan, China, 2004–2018

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yujuan Yue ◽  
Qiyong Liu ◽  
Xiaobo Liu ◽  
Haixia Wu ◽  
Mingfang Xu
Keyword(s):  
Incidence Rate ◽  
Dengue Fever ◽  
Mainland China ◽  
Prevention Measures ◽  
Pearl River Delta Region ◽  
Peak Period ◽  
Male Predominance ◽  
Seasonal Characteristics ◽  
Imported Cases ◽  
Epidemiological Characteristics

Abstract Background In China, Guangdong and Yunnan are the two most dengue-affected provinces. This study aimed to compare the epidemiological characteristics of dengue fever in Guangdong and Yunnan during 2004–2018. Methods Descriptive analyses were used to explore the temporal, spatial, and demographic distribution of dengue fever. Results Of the 73,761 dengue cases reported in mainland China during 2004–2018, 93.7% indigenous and 65.9% imported cases occurred in Guangdong and Yunnan, respectively. A total of 55,970 and 5938 indigenous cases occurred in 108 Guangdong and 8 Yunnan counties, respectively during 2004–2018. Whereas 1146 and 3050 imported cases occurred in 84 Guangdong and 72 Yunnan counties, respectively during 2004–2018. Guangdong had a much higher average yearly indigenous incidence rate (3.65 (1/100000) vs 0.86 (1/100000)), but a much lower average yearly imported incidence rate (0.07 (1/100000) vs 0.44(1/100000)) compared with Yunnan in 2004–2018. Furthermore, dengue fever occurred more widely in space and more frequently in time in Guangdong. Guangdong and Yunnan had similar seasonal characteristics for dengue fever, but Guangdong had a longer peak period. Most dengue cases were clustered in the south-western border of Yunnan and the Pearl River Delta region in Guangdong. Most of the imported cases (93.9%) in Guangdong and Yunnan were from 9 Southeast Asian countries. Thailand, Cambodia, and Malaysia imported mainly into Guangdong while Myanmar and Laos imported into Yunnan. There was a strong male predominance among imported cases and an almost equal gender distribution among indigenous cases. Most dengue cases occurred in individuals aged 21–50 years, accounting for 57.3% (Guangdong) vs. 62.8% (Yunnan) of indigenous and 83.2% (Guangdong) vs. 62.6% (Yunnan) of imported cases. The associated major occupations (house worker or unemployed, retiree, and businessman, for indigenous cases; and businessman, for imported cases), were similar. However, farmers accounted for a larger proportion of dengue cases in Yunnan. Conclusions Identifying the different epidemiological characteristics of dengue fever in Guangdong and Yunnan can be helpful to formulate targeted, strategic plans, and implement effective public health prevention measures in China.

scholarly journals Exploring Epidemiological Characteristics of Domestic Imported Dengue Fever in Mainland China, 2014–2018

2019 ◽  
Vol 16 (20) ◽  
pp. 3901 ◽  
Author(s):  
Yujuan Yue ◽  
Qiyong Liu
Keyword(s):  
Dengue Fever ◽  
Mainland China ◽  
Control Measures ◽  
Seasonal Characteristics ◽  
Strategic Plans ◽  
Imported Cases ◽  
Prevention And Control Measures ◽  
And Control ◽  
Effective Public Health ◽  
Epidemiological Characteristics

Epidemiological characteristics of domestic imported dengue fever in mainland China, 2014–2018, including time-series, spatial mobility and crowd features, were analyzed. There existed seasonal characteristics from August to November. The 872 domestic imported cases from 8 provinces, located in the southeastern, southwestern and southern coastal or border areas, were imported to 267 counties in 20 provinces of mainland China, located in the outer areas along the southwest-northeast line. The 628 domestic imported cases were still imported to the adjacent counties in the provinces themselves, 234 domestic imported cases were imported to 12 other provinces except the 8 original exported provinces, 493 cases in 2014 reached the peak, and 816 domestic imported cases were from Guangdong (675) and Yunnan (141). Domestic imported cases from Guangdong were imported to 218 counties, and 475 cases from Guangdong were imported to the adjacent counties in Guangdong itself. There were more male cases than female cases except in 2016. Domestic imported cases were clustered from 21 to 50 years old. The top three cases were from farmer, worker and housework or unemployed. The findings are helpful to formulate targeted, strategic plans and implement effective public health prevention and control measures.

scholarly journals Characteristics and Temporal-Spatial Analysis of Overseas Imported Dengue Fever Cases in Outbreak Provinces of China, 2005-2019

2021 ◽  
Author(s):  
Xinchang Lun ◽  
Yiguan Wang ◽  
Chunchun Zhao ◽  
Haixia Wu ◽  
Caiying Zhu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Dengue Fever ◽  
Prevention And Control ◽  
Mainland China ◽  
Information Management System ◽  
Northern Region ◽  
Business Services ◽  
Imported Cases ◽  
And Control ◽  
Epidemiological Characteristics

Abstract (1) Background: Overseas imported dengue fever is an important factor in the local epidemic of dengue fever in mainland China. Therefore, in order to effectively prevent and control the local epidemic of dengue fever in mainland China, the epidemiological characteristics and temporal-spatial distribution of overseas imported dengue fever cases in provinces where dengue fever is endemic in mainland China are explored. (2) Methods: Through the infectious disease report information management system of the Chinese Disease Prevention and Control Information System, we sorted out overseas imported dengue fever cases in local outbreaks of dengue fever in mainland China from 2005 to 2019. Using Excel 2016 to sort out the data and draw the epidemic curve and population characteristic distribution of overseas imported cases in each province. Using ArcGIS 10.7 and SaTScan 9.5, we analyzed the temporal-spatial distribution of dengue fever in provinces where dengue fever is outbreak in mainland China. (3) Results: A total of 11407 imported cases, mainly from Southeast Asia, were recorded from 2005 to 2019 in 13 provinces, of which 62.08% were imported into Yunnan and Guangdong provinces. Among the imported cases, there were more males than females, mainly from 21-50 age group. 59.18% of the cases were farmers, businessmen, housework or unemployed. The hot spots were concentrated in parts of Yunnan and Guangdong provinces. Meanwhile,we found the clustered areas were expanding northward. (4) Conclusions: Focus on the publicity and education of dengue fever prevention knowledge among men, 21-50 years old, farmers, business services, housework or unemployed professionals. Further improve the awareness of the prevention and control of imported cases in border areas and economically developed cities. At the same time, the northern region cannot relax its vigilance.

scholarly journals Spatial Dynamics of Dengue Fever in Mainland China, 2019

2021 ◽  
Vol 18 (6) ◽  
pp. 2855
Author(s):  
Yujuan Yue ◽  
Xiaobo Liu ◽  
Dongsheng Ren ◽  
Haixia Wu ◽  
Qiyong Liu
Keyword(s):  
Dengue Fever ◽  
Spatial Dynamics ◽  
Mainland China ◽  
Control Measures ◽  
Spatial Characteristics ◽  
Strategic Plans ◽  
Imported Cases ◽  
Prevention And Control Measures ◽  
And Control ◽  
Effective Public Health

New spatial characteristics of dengue fever in mainland China during 2019 were analyzed. There was a dengue fever outbreak in mainland China in 2019, with 15,187 indigenous cases in 13 provinces, 1281 domestic imported cases from 12 provinces and 5778 overseas imported cases from 47 countries, more than the previous cases during the period 2005–2018, except for in 2014. Indigenous cases occurred in Sichuan, Hubei and Chongqing in 2019. There have been big changes in the spatial distribution and proportion of dengue cases. Indigenous cases were not only located in the southwestern border and southeastern coastal provinces of Yunnan, Guangdong, Guangxi and Fujian but also in the central provinces of Jiangxi and Chongqing. Domestic imported cases were not only from Guangdong, but also from Yunnan. There were five new sources of importation of cases. Overseas imported cases were mainly from Cambodia and Myanmar in 2019. Understanding the new spatial characteristics of dengue fever in China helps to formulate targeted, strategic plans and implement effective public health prevention and control measures.

scholarly journals Risk Assessment of Novel Coronavirus COVID-19 Outbreaks Outside China

2020 ◽  
Vol 9 (2) ◽  
pp. 571 ◽  
Author(s):  
Péter Boldog ◽  
Tamás Tekeli ◽  
Zsolt Vizi ◽  
Attila Dénes ◽  
Ferenc A. Bartha ◽  
...  
Keyword(s):  
Control Measure ◽  
Mainland China ◽  
Destination Country ◽  
Control Measures ◽  
Cumulative Number ◽  
Travel Restrictions ◽  
Imported Cases ◽  
Major Outbreak ◽  
Novel Coronavirus ◽  
Local Reproduction

We developed a computational tool to assess the risks of novel coronavirus outbreaks outside of China. We estimate the dependence of the risk of a major outbreak in a country from imported cases on key parameters such as: (i) the evolution of the cumulative number of cases in mainland China outside the closed areas; (ii) the connectivity of the destination country with China, including baseline travel frequencies, the effect of travel restrictions, and the efficacy of entry screening at destination; and (iii) the efficacy of control measures in the destination country (expressed by the local reproduction number R loc ). We found that in countries with low connectivity to China but with relatively high R loc , the most beneficial control measure to reduce the risk of outbreaks is a further reduction in their importation number either by entry screening or travel restrictions. Countries with high connectivity but low R loc benefit the most from policies that further reduce R loc . Countries in the middle should consider a combination of such policies. Risk assessments were illustrated for selected groups of countries from America, Asia, and Europe. We investigated how their risks depend on those parameters, and how the risk is increasing in time as the number of cases in China is growing.

scholarly journals Autochthonous chikungunya and dengue fever outbreak in Mainland France, 2010-2018

2019 ◽  
Vol 29 (Supplement_4) ◽  
Author(s):  
F Franke ◽  
S Giron ◽  
A Cochet ◽  
C Jeannin ◽  
I Leparc-Goffart ◽  
...  
Keyword(s):  
Dengue Fever ◽  
Urban Areas ◽  
Control Measures ◽  
Entomological Surveillance ◽  
Awareness Campaigns ◽  
Investigation Methods ◽  
Imported Cases ◽  
Set Up ◽  
And Control ◽  
Autochthonous Transmission

Abstract Background Aedes albopictus, vector of dengue and chikungunya viruses, is implanted in mainland France, exposing to the risk of autochthonous transmission. Since 2006, epidemiological and entomological surveillance activities aim to prevent or limit the occurrence of autochthonous cases. We aimed to describe episodes of transmission and control measures implemented in order to reflect on surveillance activities. Methods We reviewed all publications and documents produced on autochthonous transmission episodes in France and surveillance protocols. We reviewed surveillance activities, investigation methods and control measures implemented. Results Between 2010 and 2018, eight episodes of autochthonous dengue fever transmission and three of chikungunya were recorded in mainland France. All of them occurred in the South east of France, between July and October, when vector density was the highest. Transmission areas were limited to single domestic houses located in discontinuous urban areas. Only two episodes happened in two distinct areas. Chikungunya episodes led to 31 cases and dengue fever episodes to 23 cases. Most cases were identified by door-to-door investigations set-up in transmission areas. We isolated serotypes 1 and 2 for dengue and East Central South Africa lineage for chikungunya in autochthonous cases. Adulticide vector control measures were effective in controlling transmission. Seven episodes of transmission were due to failure in identifying primary imported cases. Four episodes occurred because of the absence or the lack of vector controls measures around primary imported cases. Conclusions Surveillance activities, and autochthonous cases investigations, were effective in limiting the extent of transmission, but were highly demanding for surveillance actors. Identified causes of transmission highlight the need of regular awareness campaigns targeting physicians and biologists. Key messages Effectiveness of the surveillance system of dengue, chikungunya and zika viruses, and autochthonous cases investigations. Needs of awareness and training courses targeting health professionals to the risk represented by these viruses.

scholarly journals Role of Wild Boar in the Spread of Classical Swine Fever in Japan

Pathogens ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 206 ◽  
Author(s):  
Ito ◽  
Jurado ◽  
Bosch ◽  
Ito ◽  
Sánchez-Vizcaíno ◽  
...  
Keyword(s):  
Wild Boar ◽  
Spatial Association ◽  
Classical Swine Fever ◽  
Temporal Analysis ◽  
Control Measures ◽  
Domestic Pig ◽  
Potential Contact ◽  
Spatio Temporal ◽  
Epidemiological Characteristics ◽  
Gifu Prefecture

Since September 2018, nearly 900 notifications of classical swine fever (CSF) have been reported in Gifu Prefecture (Japan) affecting domestic pig and wild boar by the end of August 2019. To determine the epidemiological characteristics of its spread, a spatio-temporal analysis was performed using actual field data on the current epidemic. The spatial study, based on standard deviational ellipses of official CSF notifications, showed that the disease likely spread to the northeast part of the prefecture. A maximum significant spatial association estimated between CSF notifications was 23 km by the multi-distance spatial cluster analysis. A space-time permutation analysis identified two significant clusters with an approximate radius of 12 and 20 km and 124 and 98 days of duration, respectively. When the area of the identified clusters was overlaid on a map of habitat quality, approximately 82% and 75% of CSF notifications, respectively, were found in areas with potential contact between pigs and wild boar. The obtained results provide information on the current CSF epidemic, which is mainly driven by wild boar cases with sporadic outbreaks on domestic pig farms. These findings will help implement control measures in Gifu Prefecture.

scholarly journals The increasing menace of dengue in Guangzhou, 2001–2016: the most important epicenter in mainland China

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Zhoubin Zhang ◽  
Qinlong Jing ◽  
Zongqiu Chen ◽  
Tiegang Li ◽  
Liyun Jiang ◽  
...  
Keyword(s):  
Incidence Rate ◽  
Control Strategies ◽  
Mainland China ◽  
Time Period ◽  
Dengue Transmission ◽  
Infectious Disease Reporting ◽  
Imported Cases ◽  
System Data ◽  
Using Data ◽  
Epidemiological Characteristics

Abstract Background Dengue is the most prevalent mosquito-borne disease in the world, with China affected seriously in recent years. 65.8% of dengue cases identified in mainland China since 2005 were reported from the city of Guangzhou. Methods In this study, we described the incidence rate and distribution of dengue cases using data collected form National Notifiable Infectious Disease Reporting Information System data in Guangzhou for 2001 to 2016. All dengue cases were investigated using standardized questionnaire. Results A total of 42,469 dengue cases were reported, with an average annual incidence rate of 20.99 per 100,000 resident population. Over this time period, the incidence rate of indigenous cases increased. Dengue affected areas also expanded sharply geographically from 58.1% of communities affected during 2001–2005 to 96.4% of communities affected in 2011–2016. Overall 95.30% of the overseas imported cases were reported during March and December, while 99.79% of indigenous cases were reported during July and November. All four dengue virus serotypes were identified both in imported cases and indigenous cases. The Aedes albopictus mosquito was the only vector for dengue transmission in the area. Conclusions Guangzhou has become the dengue epicenter in mainland China. Control strategies for dengue should be adjusted to the epidemiological characteristics above and intensive study need to be conducted to explore the factors that driving the rapid increase of dengue.

scholarly journals Epidemiological characteristics of the first 100 cases of coronavirus disease 2019 (COVID-19) in Hong Kong Special Administrative Region, China, a city with a stringent containment policy

2020 ◽  
Vol 49 (4) ◽  
pp. 1096-1105 ◽  
Author(s):  
Christopher K C Lai ◽  
Rita W Y Ng ◽  
Martin C S Wong ◽  
Ka Chun Chong ◽  
Yun Kit Yeoh ◽  
...  
Keyword(s):  
Hong Kong ◽  
Incubation Period ◽  
Mainland China ◽  
Control Measures ◽  
Contact Tracing ◽  
Border Control ◽  
Government Information ◽  
Epidemic Curve ◽  
Containment Policy ◽  
Epidemiological Characteristics

Abstract Background Hong Kong (HK) is a densely populated city near the epicentre of the coronavirus disease 2019 (COVID-19) outbreak. Stringent border control together with aggressive case finding, contact tracing, social distancing and quarantine measures were implemented to halt the importation and spread of the virus. Methods We performed an epidemiological study using government information covering the first 100 confirmed cases to examine the epidemic curve, incidence, clusters, reproduction number (Rt), incubation period and time to containment. Results A total of 93 of the 100 cases were HK residents (6 infected in Mainland China, 10 on the Diamond Princess Cruise). Seven were visitors infected in Mainland China before entering HK. The majority (76%) were aged ≥45 years, and the incidence increased with age (P < 0.001). Escalation of border control measures correlated with a decrease in the proportion (62.5% to 0%) of cases imported from Mainland China, and a reduction in Rt (1.07 to 0.75). The median incubation period was 4.2 days [95% confidence interval (CI), 4.0–4.5; 5th and 95th percentiles: 1.3 and 14.0). Most clusters with identifiable epidemiological links were households involving 2–4 people. Three medium-spreading events were identified: two from New Year gatherings (6–11 people), and another from environmental contamination of a worship hall (12 people). Despite intensified contact tracing, containment was delayed in 78.9% of cases (mean = 5.96 days, range = 0–24 days). An unusual transmission in a multi-storey building via faulty toilet plumbing was suspected with >100 residents evacuated overnight. Our analysis indicated that faulty plumbing was unlikely to be the source of this transmission. Conclusion Timely stringent containment policies minimized the importation and transmission of COVID-19 in HK.

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