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Spatial epidemiology

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https://www.readbyqxmd.com/read/28221107/use-of-mass-participation-outdoor-events-to-assess-human-exposure-to-tickborne-pathogens
#1
Jessica L Hall, Kathrin Alpers, Kevin J Bown, Stephen J Martin, Richard J Birtles
Mapping the public health threat of tickborne pathogens requires quantification of not only the density of infected host-seeking ticks but also the rate of human exposure to these ticks. To efficiently sample a high number of persons in a short time, we used a mass-participation outdoor event. In June 2014, we sampled ≈500 persons competing in a 2-day mountain marathon run across predominantly tick-infested habitat in Scotland. From the number of tick bites recorded and prevalence of tick infection with Borrelia burgdoferi sensu lato and B...
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28209138/using-whole-genome-sequencing-to-investigate-transmission-in-a-multi-host-system-bovine-tuberculosis-in-new-zealand
#2
Joseph Crispell, Ruth N Zadoks, Simon R Harris, Brent Paterson, Desmond M Collins, Geoffrey W de-Lisle, Paul Livingstone, Mark A Neill, Roman Biek, Samantha J Lycett, Rowland R Kao, Marian Price-Carter
BACKGROUND: Bovine tuberculosis (bTB), caused by Mycobacterium bovis, is an important livestock disease raising public health and economic concerns around the world. In New Zealand, a number of wildlife species are implicated in the spread and persistence of bTB in cattle populations, most notably the brushtail possum (Trichosurus vulpecula). Whole Genome Sequenced (WGS) M. bovis isolates sourced from infected cattle and wildlife across New Zealand were analysed. Bayesian phylogenetic analyses were conducted to estimate the substitution rate of the sampled population and investigate the role of wildlife...
February 16, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28196849/a-population-based-study-of-sociodemographic-and-geographic-variation-in-hpv-vaccination
#3
Lila J Finney Rutten, Patrick M Wilson, Debra J Jacobson, Amenah A Agunwamba, Carmen Radecki Breitkopf, Robert M Jacobson, Jennifer L St Sauver
BACKGROUND: HPV vaccination rates in the U.S. remain low and lag behind other recommended adolescent vaccines. Studies evaluating the association of geographic and area-level characteristics with HPV vaccination rates provide a valuable resource for public health planning. METHOD: We used the Rochester Epidemiology Project data linkage system to ascertain HPV vaccination rates between 2010 and 2015 in a 7-county region of southern MN. Geocoded individual patient data was spatially linked to socioeconomic data from the American Community Survey at the census block group level...
February 14, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28193880/spatial-and-temporal-dynamics-of-superspreading-events-in-the-2014-2015-west-africa-ebola-epidemic
#4
Max S Y Lau, Benjamin Douglas Dalziel, Sebastian Funk, Amanda McClelland, Amanda Tiffany, Steven Riley, C Jessica E Metcalf, Bryan T Grenfell
The unprecedented scale of the Ebola outbreak in Western Africa (2014-2015) has prompted an explosion of efforts to understand the transmission dynamics of the virus and to analyze the performance of possible containment strategies. Models have focused primarily on the reproductive numbers of the disease that represent the average number of secondary infections produced by a random infectious individual. However, these population-level estimates may conflate important systematic variation in the number of cases generated by infected individuals, particularly found in spatially localized transmission and superspreading events...
February 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28181903/widespread-activity-of-multiple-lineages-of-usutu-virus-western-europe-2016
#5
Daniel Cadar, Renke Lühken, Henk van der Jeugd, Mutien Garigliany, Ute Ziegler, Markus Keller, Jennifer Lahoreau, Lars Lachmann, Norbert Becker, Marja Kik, Bas B Oude Munnink, Stefan Bosch, Egbert Tannich, Annick Linden, Volker Schmidt, Marion P Koopmans, Jolianne Rijks, Daniel Desmecht, Martin H Groschup, Chantal Reusken, Jonas Schmidt-Chanasit
In the summer of 2016, Belgium, France, Germany and the Netherlands reported widespread Usutu virus (USUV) activity based on live and dead bird surveillance. The causative USUV strains represented four lineages, of which two putative novel lineages were most likely recently introduced into Germany and spread to other western European countries. The spatial extent of the outbreak area corresponded with R0 values > 1. The occurrence of the outbreak, the largest USUV epizootic registered so far in Europe, allowed us to gain insight in how a recently introduced arbovirus with potential public health implications can spread and become a resident pathogen in a naïve environment...
January 26, 2017: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
https://www.readbyqxmd.com/read/28162096/intestinal-schistosomiasis-in-uganda-at-high-altitude-1400%C3%A2-m-malacological-and-epidemiological-surveys-on-mount-elgon-and-in-fort-portal-crater-lakes-reveal-extra-preventive-chemotherapy-needs
#6
Michelle C Stanton, Moses Adriko, Moses Arinaitwe, Alison Howell, Juliet Davies, Gillian Allison, E James LaCourse, Edridah Muheki, Narcis B Kabatereine, J Russell Stothard
BACKGROUND: Intestinal schistosomiasis is of public health importance in Uganda but communities living above 1400 m are not targeted for control as natural transmission is thought unlikely. To assess altitudinal boundaries and at-risk populations, conjoint malacological and epidemiological surveys were undertaken on Mount Elgon (1139 m-3937 m), in Fort Portal crater lakes and in the Rwenzori Mountains (1123 m-4050 m). METHODS: Seventy freshwater habitats [Mount Elgon (37), Fort Portal crater lakes (23), Rwenzori Mountains (8) and Lake Albert (2)] were inspected for Biomphalaria species...
February 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28155030/compositional-analysis-of-topsoil-metals-and-its-associations-with-cancer-mortality-using-spatial-misaligned-data
#7
Gonzalo López-Abente, Juan Locutura-Rupérez, Pablo Fernández-Navarro, Iván Martín-Méndez, Alejandro Bel-Lan, Olivier Núñez
The presence of toxic metals in soil per se, and in soil impacted by mining, industry, agriculture and urbanisation in particular, is a major concern for both human health and ecotoxicology. The dual aim of this study was: to ascertain whether topsoil composition could influence the spatial distribution of mortality due to different types of cancer and to identify possible errors committed by epidemiological studies which analyse soil composition data as a closed number system. We conducted an ecological cancer mortality study, covering 861,440 cancer deaths (27 cancer sites) in 7917 Spanish mainland towns, from 1999 to 2008...
February 2, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28144600/spatial-factors-affecting-the-frequency-of-pedestrian-traffic-crashes-a-systematic-review
#8
REVIEW
Ali Moradi, Hamid Soori, Amir Kavousi, Farshid Eshghabadi, Ensiyeh Jamshidi
CONTEXT: Considering the importance of pedestrian traffic crashes and the role of environmental factors in the frequency of crashes, this paper aimed to review the published evidence and synthesize the results of related studies for the associations between environmental factors and distribution of pedestrian-vehicular traffic crashes. EVIDENCE ACQUISITION: We searched all epidemiological studies from 1966 to 2015 in electronic databases. We found 2,828 studies...
December 2016: Archives of Trauma Research
https://www.readbyqxmd.com/read/28137270/malaria-control-and-prevention-towards-elimination-data-from-an-eleven-year-surveillance-in-shandong-province-china
#9
Xiangli Kong, Xin Liu, Hong Tu, Yan Xu, Jianbing Niu, Yongbin Wang, Changlei Zhao, Jingxuan Kou, Jun Feng
BACKGROUND: Shandong Province experienced a declining malaria trend of local-acquired transmission, but the increasing imported malaria remains a challenge. Therefore, understanding the epidemiological characteristics of malaria and the control and elimination strategy and interventions is needed for better planning to achieve the overall elimination goal in Shandong Province. METHODS: A retrospective study was conducted and all individual cases from a web-based reporting system were reviewed and analysed to explore malaria-endemic characteristics in Shandong from 2005 to 2015...
January 31, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28129368/evaluation-of-the-gini-coefficient-in-spatial-scan-statistics-for-detecting-irregularly-shaped-clusters
#10
Jiyu Kim, Inkyung Jung
Spatial scan statistics with circular or elliptic scanning windows are commonly used for cluster detection in various applications, such as the identification of geographical disease clusters from epidemiological data. It has been pointed out that the method may have difficulty in correctly identifying non-compact, arbitrarily shaped clusters. In this paper, we evaluated the Gini coefficient for detecting irregularly shaped clusters through a simulation study. The Gini coefficient, the use of which in spatial scan statistics was recently proposed, is a criterion measure for optimizing the maximum reported cluster size...
2017: PloS One
https://www.readbyqxmd.com/read/28128802/-epidemiology-of-caprine-brucellosis-in-the-central-zone-of-the-state-of-veracruz
#11
Daniela Lucía Román-Ramírez, David Itzcoatl Martínez-Herrera, José Alfredo Villagómez-Cortés, Álvaro Enrique de Jesús Peniche-Cardeña, José Francisco Morales-Álvarez, Ricardo Flores-Castro
INTRODUCTION: Brucellosis is a disease of high morbidity that affects several animal species, is transmitted to humans and, therefore, is a zoonosis. It is caused by bacteria of the genus Brucella. In this study we aim to determine seroprevalence, risk factors, and spatial distribution of caprine brucellosis in 14 municipalities in the central region of the state of Veracruz. MATERIALS AND METHODS: This cross-stratified multistage study was conducted between 2009 and 2012...
January 2017: Gaceta Médica de México
https://www.readbyqxmd.com/read/28126406/elf-exposure-from-mobile-and-cordless-phones-for-the-epidemiological-mobi-kids-study
#12
Carolina Calderón, Hiroki Ichikawa, Masao Taki, Kanako Wake, Darren Addison, Terry Mee, Myron Maslanyj, Hans Kromhout, Ae-Kyoung Lee, Malcolm R Sim, Joe Wiart, Elisabeth Cardis
This paper describes measurements and computational modelling carried out in the MOBI-Kids case-control study to assess the extremely low frequency (ELF) exposure of the brain from use of mobile and cordless phones. Four different communication systems were investigated: Global System for Mobile (GSM), Universal Mobile Telecommunications System (UMTS), Digital Enhanced Cordless Telecommunications (DECT) and Wi-Fi Voice over Internet Protocol (VoIP). The magnetic fields produced by the phones during transmission were measured under controlled laboratory conditions, and an equivalent loop was fitted to the data to produce three-dimensional extrapolations of the field...
January 23, 2017: Environment International
https://www.readbyqxmd.com/read/28126001/serology-reveals-heterogeneity-of-plasmodium-falciparum-transmission-in-northeastern-south-africa-implications-for-malaria-elimination
#13
Joseph Biggs, Jaishree Raman, Jackie Cook, Khumbulani Hlongwana, Chris Drakeley, Natashia Morris, Ishen Serocharan, Eunice Agubuzo, Philip Kruger, Aaron Mabuza, Alpheus Zitha, Elliot Machaba, Maureen Coetzee, Immo Kleinschmidt
BACKGROUND: It is widely acknowledged that modifications to existing control interventions are required if South Africa is to achieve malaria elimination. Targeting indoor residual spraying (IRS) to areas where cases have been detected is one strategy currently under investigation in northeastern South Africa. This seroprevalence baseline study, nested within a targeted IRS trial, was undertaken to provide insights into malaria transmission dynamics in South Africa and evaluate whether sero-epidemiological practices have the potential to be routinely incorporated into elimination programmes...
January 26, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28122195/an-epidemiological-model-of-internet-worms-with-hierarchical-dispersal-and-spatial-clustering-of-hosts
#14
David E Hiebeler, Andrew Audibert, Emma Strubell, Isaac J Michaud
Beginning in 2001, many instances of malicious software known as Internet worms have been using biological strategies such as hierarchical dispersal to seek out and spread to new susceptible hosts more efficiently. We measured the distribution of potentially susceptible hosts in the space of Internet addresses to determine their clustering. We have used the results to construct a full-size simulated Internet with 2(32) hosts with mean and variance of susceptible hosts chosen to match our measurements at multiple spatial scales...
January 22, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28115677/modeling-the-ecological-niche-of-bacillus-anthracis-to-map-anthrax-risk-in-kyrgyzstan
#15
Jason K Blackburn, Saitbek Matakarimov, Sabira Kozhokeeva, Zhyldyz Tagaeva, Lindsay K Bell, Ian T Kracalik, Asankadyr Zhunushov
Anthrax, caused by the environmental bacterium Bacillus anthracis, is an important zoonosis nearly worldwide. In Central Asia, anthrax represents a major veterinary and public health concern. In the Republic of Kyrgyzstan, ongoing anthrax outbreaks have been reported in humans associated with handling infected livestock and contaminated animal by-products such as meat or hides. The current anthrax situation has prompted calls for improved insights into the epidemiology, ecology, and spatial distribution of the disease in Kyrgyzstan to better inform control and surveillance...
January 23, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28104506/assessing-the-risk-of-dengue-virus-transmission-in-a-non-endemic-city-surrounded-by-endemic-and-hyperendemic-areas
#16
Tsz Ho Kwan, Shui Shan Lee, Denise Pui Chung Chan, Manton Cheung, Kai Man Kam
OBJECTIVE: To assess the potential risk of dengue transmission in a non-endemic city using a spatial epidemiological approach. METHODS: Past dengue exposure of the general population was examined by dengue virus (DENV) IgG testing of archived samples from voluntary blood donors. Vector intensities were determined by local ovitrap index (OI). Analyses were made in the context of population statistics at both the district and sub-district level. RESULTS: The overall prevalence of DENV IgG was low at 2...
January 16, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28103964/epidemiology-of-soil-transmitted-helminthiases-related-mortality-in-brazil
#17
Francisco R Martins-Melo, Alberto N Ramos, Carlos H Alencar, Mauricélia S Lima, Jorg Heukelbach
Soil-transmitted helminth (STH) infections are widely distributed in tropical and subtropical areas, including Brazil. We performed a nationwide population-based study including all deaths in Brazil from 2000 to 2011, in which STHs (ascariasis, trichuriasis and/or hookworm infection) were mentioned on death certificates, either as underlying or as associated causes of death. Epidemiological characteristics, time trends and spatial analysis of STH-related mortality were analysed. STHs was identified on 853/12 491 280 death certificates: 827 (97·0%) deaths related to ascariasis, 25 (2·9%) to hookworm infections, and 1 (0·1%) to trichuriasis...
January 20, 2017: Parasitology
https://www.readbyqxmd.com/read/28098531/changing-epidemiology-of-human-brucellosis-china-1955-2014
#18
Shengjie Lai, Hang Zhou, Weiyi Xiong, Marius Gilbert, Zhuojie Huang, Jianxing Yu, Wenwu Yin, Liping Wang, Qiulan Chen, Yu Li, Di Mu, Lingjia Zeng, Xiang Ren, Mengjie Geng, Zike Zhang, Buyun Cui, Tiefeng Li, Dali Wang, Zhongjie Li, Nicola A Wardrop, Andrew J Tatem, Hongjie Yu
Brucellosis, a zoonotic disease, was made statutorily notifiable in China in 1955. We analyzed the incidence and spatial-temporal distribution of human brucellosis during 1955-2014 in China using notifiable surveillance data: aggregated data for 1955-2003 and individual case data for 2004-2014. A total of 513,034 brucellosis cases were recorded, of which 99.3% were reported in northern China during 1955-2014, and 69.1% (258, 462/374, 141) occurred during February-July in 1990-2014. Incidence remained high during 1955-1978 (interquartile range 0...
February 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28095428/linking-ecology-and-epidemiology-to-understand-predictors-of-multi-host-responses-to-an-emerging-pathogen-the-amphibian-chytrid-fungus
#19
Stephanie S Gervasi, Patrick R Stephens, Jessica Hua, Catherine L Searle, Gisselle Yang Xie, Jenny Urbina, Deanna H Olson, Betsy A Bancroft, Virginia Weis, John I Hammond, Rick A Relyea, Andrew R Blaustein
Variation in host responses to pathogens can have cascading effects on populations and communities when some individuals or groups of individuals display disproportionate vulnerability to infection or differ in their competence to transmit infection. The fungal pathogen, Batrachochytrium dendrobatidis (Bd) has been detected in almost 700 different amphibian species and is implicated in numerous global amphibian population declines. Identifying key hosts in the amphibian-Bd system-those who are at greatest risk or who pose the greatest risk for others-is challenging due in part to many extrinsic environmental factors driving spatiotemporal Bd distribution and context-dependent host responses to Bd in the wild...
2017: PloS One
https://www.readbyqxmd.com/read/28091336/who-are-the-patients-that-default-tuberculosis-treatment-space-matters
#20
C Nunes, R Duarte, A M Veiga, B Taylor
The goals of this article are: (i) to understand how individual characteristics affect the likelihood of patients defaulting their pulmonary tuberculosis (PTB) treatment regimens; (ii) to quantify the predictive capacity of these risk factors; and (iii) to quantify and map spatial variation in the risk of defaulting. We used logistic regression models and generalized additive models with a spatial component to determine the odds of default across continental Portugal. We focused on new PTB cases, diagnosed between 2000 and 2013, and included some individual information (sex, age, residence area, alcohol abuse, intravenous drug use, homelessness, HIV, imprisonment status)...
January 16, 2017: Epidemiology and Infection
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