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https://www.readbyqxmd.com/read/28817563/assessment-of-risk-of-dengue-and-yellow-fever-virus-transmission-in-three-major-kenyan-cities-based-on-stegomyia-indices
#1
Sheila B Agha, David P Tchouassi, Armanda D S Bastos, Rosemary Sang
Dengue (DEN) and yellow fever (YF) are re-emerging in East Africa, with contributing drivers to this trend being unplanned urbanization and increasingly adaptable anthropophilic Aedes (Stegomyia) vectors. Entomological risk assessment of these diseases remains scarce for much of East Africa and Kenya even in the dengue fever-prone urban coastal areas. Focusing on major urban cities of Kenya, we compared DEN and YF risk in Kilifi County (DEN-outbreak-prone), and Kisumu and Nairobi Counties (no documented DEN outbreaks)...
August 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28815931/organization-of-the-flavivirus-rna-replicase-complex
#2
REVIEW
Carolin Brand, Martin Bisaillon, Brian J Geiss
Flaviviruses, such as dengue, Japanese encephalitis, West Nile, yellow fever, and Zika viruses, are serious human pathogens that cause significant morbidity and mortality globally each year. Flaviviruses are single-stranded, positive-sense RNA viruses, and encode two multidomain proteins, NS3 and NS5, that possess all enzymatic activities required for genome replication and capping. NS3 and NS5 interact within virus-induced replication compartments to form the RNA genome replicase complex. Although the individual enzymatic activities of both proteins have been extensively studied and are well characterized, there are still gaps in our understanding of how they interact to efficiently coordinate their respective activities during positive-strand RNA synthesis and capping...
August 16, 2017: Wiley Interdisciplinary Reviews. RNA
https://www.readbyqxmd.com/read/28814934/direct-medical-costs-of-dengue-fever-in-vietnam-a-retrospective-study-in-a-tertiary-hospital
#3
Nhung Thi Tuyet Vo, Trang Ngo Diem Phan, Trung Quang Vo
BACKGROUND: In Vietnam, dengue fever is a major health concern, yet comprehensive information on its economic costs is lacking. The present study investigated treatment costs associated with dengue fever from the perspective of health care provision. METHODS: This retrospective study was conducted between January 2013 and December 2015 in Cu Chi General Hospital. The following dengue-related treatment costs were calculated: hospitalisation, diagnosis, specialised services, drug usage and medical supplies...
May 2017: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28810894/chikungunya-an-emerging-viral-infection-with-varied-clinical-presentations-in-bangladesh-reports-of-seven-cases
#4
Muhammad Abdur Rahim, Khwaja Nazim Uddin
BACKGROUND: Chikungunya is an emerging and rapidly spreading viral infection in many parts of the world including Bangladesh. It shares many epidemiological and clinical characteristics with dengue. So, a sound knowledge is required for its detection and differentiation from dengue, specially in endemic regions. CASE PRESENTATION: We present seven confirmed cases of chikungunya having different clinical presentations occurring among middle aged males and females from different socio-economic background in Dhaka city, the capital of Bangladesh...
August 15, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28806786/an-economic-evaluation-of-vector-control-in-the-age-of-a-dengue-vaccine
#5
Christopher Fitzpatrick, Alexander Haines, Mathieu Bangert, Andrew Farlow, Janet Hemingway, Raman Velayudhan
INTRODUCTION: Dengue is a rapidly emerging vector-borne Neglected Tropical Disease, with a 30-fold increase in the number of cases reported since 1960. The economic cost of the illness is measured in the billions of dollars annually. Environmental change and unplanned urbanization are conspiring to raise the health and economic cost even further beyond the reach of health systems and households. The health-sector response has depended in large part on control of the Aedes aegypti and Ae...
August 14, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28798927/is-dengue-emerging-as-important-cause-of-acute-liver-failure-in-endemic-regions
#6
Lavleen Singh, Amitabh Singh, Mitali Agarwal, Sataroopa Mishra
Dengue virus infection continues to be major public health problem in large part of world. The epidemiology of dengue viral infection is becoming increasingly complex and has substantially changed over almost past six decades not only in terms of prevalent strains and geographical locations but also in terms of disease severity and atypical presentations. Though liver is the most common organ affected but is generally asymptomatic. We present a case of infant with severe dengue who died of fulminant hepatic failure and showed pan lobular necrosis on post mortem liver biopsy...
July 16, 2017: World Journal of Clinical Cases
https://www.readbyqxmd.com/read/28797591/can-internet-search-queries-be-used-for-dengue-fever-surveillance-in-china
#7
Pi Guo, Li Wang, Yanhong Zhang, Ganfeng Luo, Yanting Zhang, Changyu Deng, Qin Zhang, Qingying Zhang
No abstract text is available yet for this article.
August 7, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28796789/multiple-introductions-of-the-dengue-vector-aedes-aegypti-into-california
#8
Evlyn Pless, Andrea Gloria-Soria, Benjamin R Evans, Vicki Kramer, Bethany G Bolling, Walter J Tabachnick, Jeffrey R Powell
The yellow fever mosquito Aedes aegypti inhabits much of the tropical and subtropical world and is a primary vector of dengue, Zika, and chikungunya viruses. Breeding populations of A. aegypti were first reported in California (CA) in 2013. Initial genetic analyses using 12 microsatellites on collections from Northern CA in 2013 indicated the South Central US region as the likely source of the introduction. We expanded genetic analyses of CA A. aegypti by: (a) examining additional Northern CA samples and including samples from Southern CA, (b) including more southern US populations for comparison, and (c) genotyping a subset of samples at 15,698 SNPs...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28777090/high-resolution-structure-of-a-kazal-type-serine-protease-inhibitor-from-the-dengue-vector-aedes-aegypti
#9
Ricardo J S Torquato, Stephen Lu, Nadia Helena Martins, Aparecida S Tanaka, Pedro José Barbosa Pereira
Blood-feeding exoparasites are rich sources of protease inhibitors, and the mosquito Aedes aegypti, which is a vector of Dengue virus, Yellow fever virus, Chikungunya virus and Zika virus, is no exception. AaTI is a single-domain, noncanonical Kazal-type serine proteinase inhibitor from A. aegypti that recognizes both digestive trypsin-like serine proteinases and the central protease in blood clotting, thrombin, albeit with an affinity that is three orders of magnitude lower. Here, the 1.4 Å resolution crystal structure of AaTI is reported from extremely tightly packed crystals (∼22% solvent content), revealing the structural determinants for the observed inhibitory profile of this molecule...
August 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28774993/complete-genome-sequence-of-dengue-virus-type-2-from-a-resident-of-north-central-florida-with-locally-transmitted-dengue-fever
#10
Sarah K White, Nicole M Iovine, L Connor Nickels, J Glenn Morris, John A Lednicky
The majority of dengue fever cases reported in the United States recently have been imported. We isolated dengue virus type 2 (DENV-2) from a North-Central Florida resident with locally acquired dengue fever in May 2016. This is the first evidence of autochthonous transmission of the virus in north-central Florida.
August 3, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28772262/evolution-and-emergence-of-pathogenic-viruses-past-present-and-future
#11
Mohammad K Parvez, Shama Parveen
Incidences of emerging/re-emerging deadly viral infections have significantly affected human health despite extraordinary progress in the area of biomedical knowledge. The best examples are the recurring outbreaks of dengue and chikungunya fever in tropical and sub-tropical regions, the recent epidemic of Zika in the Americas and the Caribbean, and the SARS, MERS, and influenza A outbreaks across the globe. The established natural reservoirs of human viruses are mainly farm animals, and, to a lesser extent, wild animals and arthropods...
August 4, 2017: Intervirology
https://www.readbyqxmd.com/read/28771605/impact-of-prior-flavivirus-immunity-on-zika-virus-infection-in-rhesus-macaques
#12
Michael K McCracken, Gregory D Gromowski, Heather L Friberg, Xiaoxu Lin, Peter Abbink, Rafael De La Barrera, Kenneth H Eckles, Lindsey S Garver, Michael Boyd, David Jetton, Dan H Barouch, Matthew C Wise, Bridget S Lewis, Jeffrey R Currier, Kayvon Modjarrad, Mark Milazzo, Michelle Liu, Anna B Mullins, J Robert Putnak, Nelson L Michael, Richard G Jarman, Stephen J Thomas
Studies have demonstrated cross-reactivity of anti-dengue virus (DENV) antibodies in human sera against Zika virus (ZIKV), promoting increased ZIKV infection in vitro. However, the correlation between in vitro and in vivo findings is not well characterized. Thus, we evaluated the impact of heterotypic flavivirus immunity on ZIKV titers in biofluids of rhesus macaques. Animals previously infected (≥420 days) with DENV2, DENV4, or yellow fever virus were compared to flavivirus-naïve animals following infection with a Brazilian ZIKV strain...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28771479/direct-cost-of-dengue-hospitalization-in-zhongshan-china-associations-with-demographics-virus-types-and-hospital-accreditation
#13
Jing Hua Zhang, Juan Yuan, Tao Wang
BACKGROUND: Zhongshan City of Guangdong Province (China) is a key provincial and national level area for dengue fever prevention and control. The aim of this study is to analyze how the direct hospitalization costs and the length of stay of dengue hospitalization cases vary according to associated factors such as the demographics, virus types and hospital accreditation. METHOD: This study is based on retrospective census data from the Chinese National Disease Surveillance Reporting System...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28770688/tree-hole-mosquito-species-composition-and-relative-abundances-differ-between-urban-and-adjacent-forest-habitats-in-northwestern-argentina
#14
C Mangudo, J P Aparicio, G C Rossi, R M Gleiser
Water-holding tree holes are main larval habitats for many pathogen vectors, especially mosquitoes (Diptera: Culicidae). Along 3 years, the diversity and composition of mosquito species in tree holes of two neighbouring but completely different environments, a city and its adjacent forest, were compared using generalized linear mixed models, PERMANOVA, SIMPER and species association indexes. The city area (Northwest Argentina) is highly relevant epidemiologically due to the presence of Aedes aegypti L. (main dengue vector) and occurrence of dengue outbreaks; the Yungas rainforests are highly biologically diverse...
August 3, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28770247/age-of-initial-cohort-of-dengue-patients-could-explain-the-origin-of-disease-outbreak-in-a-setting-a-case-control-study-in-rajasthan-india
#15
Annette Angel, Bennet Angel, Karuna Yadav, Neha Sharma, Vinod Joshi, Indu Thanvi, Sharad Thanvi
Dengue fever (DF) and dengue hemorrhagic fever (DHF) is a public health problem with 390 million cases reported in world annually. In Rajasthan, DF with DHF is being reported for about two decades. For undertaking interventions into disease transmission, locating origin of transmission is very important. Present paper reports retrospective analysis of the hospital reported cases of dengue during the year 2013-2014 undertaken in Barmer, Rajasthan. To address task of investigating outbreak, detailed analysis of the data on serological test results (Mac-ELISA assay of NS1, IgG and IgM) performed by local hospital, Balotra was made...
June 2017: Virusdisease
https://www.readbyqxmd.com/read/28768542/early-rigorous-control-interventions-can-largely-reduce-dengue-outbreak-magnitude-experience-from-chaozhou-china
#16
Tao Liu, Guanghu Zhu, Jianfeng He, Tie Song, Meng Zhang, Hualiang Lin, Jianpeng Xiao, Weilin Zeng, Xing Li, Zhihao Li, Runsheng Xie, Haojie Zhong, Xiaocheng Wu, Wenbiao Hu, Yonghui Zhang, Wenjun Ma
BACKGROUND: Dengue fever is a severe public heath challenge in south China. A dengue outbreak was reported in Chaozhou city, China in 2015. Intensified interventions were implemented by the government to control the epidemic. However, it is still unknown the degree to which intensified control measures reduced the size of the epidemics, and when should such measures be initiated to reduce the risk of large dengue outbreaks developing? METHODS: We selected Xiangqiao district as study setting because the majority of the indigenous cases (90...
August 2, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28765218/dengue-virus-infected-dendritic-cells-but-not-monocytes-activate-natural-killer-cells-through-a-contact-dependent-mechanism-involving-adhesion-molecules
#17
Vivian Vasconcelos Costa, Weijian Ye, Qingfeng Chen, Mauro Martins Teixeira, Peter Preiser, Eng Eong Ooi, Jianzhu Chen
Natural killer (NK) cells play a protective role against dengue virus (DENV) infection, but the cellular and molecular mechanisms are not fully understood. Using an optimized humanized mouse model, we show that human NK cells, through the secretion of gamma interferon (IFN-γ), are critical in the early defense against DENV infection. Depletion of NK cells or neutralization of IFN-γ leads to increased viremia and more severe thrombocytopenia and liver damage in humanized mice. In vitro studies using autologous human NK cells show that DENV-infected monocyte-derived dendritic cells (MDDCs), but not monocytes, activate NK cells in a contact-dependent manner, resulting in upregulation of CD69 and CD25 and secretion of IFN-γ...
August 1, 2017: MBio
https://www.readbyqxmd.com/read/28764795/participation-of-14-3-3%C3%AE%C2%B5-and-14-3-3%C3%AE-proteins-in-the-phagocytosis-component-of-cellular-immune-response-in-aedes-mosquito-cell-lines
#18
Abel Trujillo-Ocampo, Febe Elena Cázares-Raga, Rosa María Del Angel, Fernando Medina-Ramírez, Leopoldo Santos-Argumedo, Mario H Rodríguez, Fidel de la Cruz Hernández-Hernández
BACKGROUND: Better knowledge of the innate immune system of insects will improve our understanding of mosquitoes as potential vectors of diverse pathogens. The ubiquitously expressed 14-3-3 protein family is evolutionarily conserved from yeast to mammals, and at least two isoforms of 14-3-3, the ε and ζ, have been identified in insects. These proteins have been shown to participate in both humoral and cellular immune responses in Drosophila. As mosquitoes of the genus Aedes are the primary vectors for arboviruses, causing several diseases such as dengue fever, yellow fever, Zika and chikungunya fevers, cell lines derived from these mosquitoes, Aag-2 from Aedes aegypti and C6/36 HT from Aedes albopictus, are currently used to study the insect immune system...
August 1, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28764747/dengue-specific-serotype-related-to-clinical-severity-during-the-2012-2013-epidemic-in-centre-of-brazil
#19
Benigno A M Rocha, Adriana O Guilarde, Angela F L T Argolo, Marianna Peres Tassara, Lucimeire A da Silveira, Isabela C Junqueira, Marília D Turchi, Valéria C R Féres, Celina M T Martelli
Please see Additional file 1 for translations of the abstract into the five official working languages of the United Nations. BACKGROUND: Currently, in Brazil, there is a co-circulation of the four dengue (DENV-1 to DENV-4) serotypes. This study aimed to assess whether different serotypes and antibody response patterns were associated with the severity of the disease during a dengue outbreak, which occurred in 2012/2013 in centre of Brazil. METHODS: We conducted a prospective study with 452 patients with laboratory confirmed dengue in central Brazil, from January 2012 to July 2013...
August 2, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28764157/seroepidemiology-of-spotted-fever-rickettsiosis-in-uttar-pradesh-a-prospective-study
#20
Chandra Dev Pati Tripathi, Mastan Singh, Jyotsna Agarwal, Chandra Kanta, Virendra Atam
INTRODUCTION: Spotted Fever Rickettsiosis (SFR), an acute febrile illness caused by Rickettsia rickettsii, R. conorii and R. akari which is associated with considerable morbidity and mortality. SFR is one of the most covert emerging infections of the present time which is prevalent in various parts of India as shown by the increase in the number of clinically diagnosed patients in various states except Uttar Pradesh. AIM: To diagnose SFR in clinically suspected patients using serological tests and recognition of common epidemiologic situations and clinical manifestations of SFR in the state of Uttar Pradesh...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
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