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https://www.readbyqxmd.com/read/28228395/antibody-responses-to-zika-virus-infections-in-flavivirus-endemic-environments
#1
Sarah L Keasey, Christine L Pugh, Stig M R Jensen, Jessica L Smith, Robert D Hontz, Anna P Durbin, Dawn M Dudley, David H O'Connor, Robert G Ulrich
Zika virus (ZIKV) infections occur in areas where dengue (DENV), West Nile (WNV), yellow fever (YFV), and other viruses of the genus Flavivirus co-circulate. The envelope protein (E) of these closely related flaviviruses induces specific long-term immunity, yet subsequent infections are associated with cross-reactive antibody responses that may enhance disease susceptibility and severity. To gain a better understanding of ZIKV infections against a background of similar viral diseases, we examined serological immune responses to ZIKV, WNV, DENV and YFV infections of humans and non-human primates (NHP)...
February 22, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28225498/dengue-associated-hemophagocyticlymphohistiocytosis-in-an-adult-a-case-report-and-literature-review
#2
Sang Mi Chung, Joon Young Song, Wonshik Kim, Min Joo Choi, Ji Ho Jeon, Seonghui Kang, Eunju Jung, Ji Yun Noh, Hee Jin Cheong, Woo Joo Kim
BACKGROUND: Infection-associated hemophagocytic syndrome (IAHS) is potentially a fatal disease caused by systemic infection complicated by hemophagocyticlymphohistiocytosis (HLH). Here, we report a case of HLH associated with dengue hemorrhagic fever (DHF) after a trip to Thailand. CASE SUMMARY: A 33-year-old healthy female patient presented with 3 days of fever, myalgia, and skin rash. Serotype 3 dengue virus was isolated. Clinical and laboratory findings fulfilled the criteria of HLH...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28222130/dengue-virus-antibody-database-systematically-linking-serotype-specificity-with-epitope-mapping-in-dengue-virus
#3
Sidhartha Chaudhury, Gregory D Gromowski, Daniel R Ripoll, Ilja V Khavrutskii, Valmik Desai, Anders Wallqvist
BACKGROUND: A majority infections caused by dengue virus (DENV) are asymptomatic, but a higher incidence of severe illness, such as dengue hemorrhagic fever, is associated with secondary infections, suggesting that pre-existing immunity plays a central role in dengue pathogenesis. Primary infections are typically associated with a largely serotype-specific antibody response, while secondary infections show a shift to a broadly cross-reactive antibody response. METHODS/PRINCIPAL FINDINGS: We hypothesized that the basis for the shift in serotype-specificity between primary and secondary infections can be found in a change in the antibody fine-specificity...
February 21, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28220810/dengue-virus-ns1-protein-activates-immune-cells-via-tlr4-but-not-tlr2-or-tlr6
#4
Naphak Modhiran, Daniel Watterson, Antje Blumenthal, Alan G Baxter, Paul R Young, Katryn J Stacey
The secreted hexameric form of the dengue virus (DENV) non-structural protein 1 (NS1) has recently been shown to elicit inflammatory cytokine release and disrupt endothelial cell monolayer integrity. This suggests that circulating NS1 contributes to the vascular leak that plays a major role in the pathology of dengue haemorrhagic fever and shock. Pathways activated by NS1 are thus of great interest as potential therapeutic targets. Recent works have separately implicated both toll-like receptor 4 (TLR4) and the TLR2/6 heterodimer in immune cell activation by NS1...
February 21, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28219910/severe-plasmodium-knowlesi-with-dengue-coinfection
#5
Mohd Jazman Che Rahim, Nurashikin Mohammad, Alwi Muhd Besari, Wan Syamimee Wan Ghazali
We report a case of severe Plasmodium knowlesi and dengue coinfection in a previously healthy 59-year-old Malay man who presented with worsening shortness of breath, high-grade fever with chills and rigors, dry cough, myalgia, arthralgia, chest discomfort and poor appetite of 1 week duration. There was a history mosquito fogging around his neighbourhood in his hometown. Further history revealed that he went to a forest in Jeli (northern part of Kelantan) 3 weeks prior to the event. Initially he was treated as severe dengue with plasma leakage complicated with type 1 respiratory failure as evidenced by positive serum NS1-antigen and thrombocytopenia...
February 20, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28219668/outbreak-of-dengue-virus-type-3-in-malakand-pakistan-2015-a-laboratory-perspective
#6
Muhammad Suleman, Rani Faryal, Muhammad Masroor Alam, Adnan Khurshid, Salmaan Sharif, Shahzad Shaukat, Mehar Angez, Massab Umair, Mian Muhammad Sufian, Yasir Arshad, Tanveer Inam, Syed Sohail Zahoor Zaidi
An outbreak of dengue fever was reported in Malakand district, Khyber Pakhtunkhwa (KP) province of Pakistan during 2015. Detection of viral RNA by real-time PCR confirmed dengue virus serotype-3 (DENV-3) to be the causative agent causing the outbreak. Phylogenetic analysis based on partial E-NS1 gene sequences showed that the DENV-3 viruses belonged to genotype III with maximum homology with the dengue-3 strains previously reported from Pakistan and India. Our current report provides updated information on molecular epidemiology and phylogenetic analysis of dengue virus serotypes responsible for 2015 outbreak in KP...
February 17, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28218572/ictv-virus-taxonomy-profile-flaviviridae
#7
Peter Simmonds, Paul Becher, Jens Bukh, Ernest A Gould, Gregor Meyers, Tom Monath, Scott Muerhoff, Alexander Pletnev, Rebecca Rico-Hesse, Donald B Smith, Jack T Stapleton, Ictv Report Consortium
The Flaviviridae is a family of small enveloped viruses with RNA genomes of 9000-13 000 bases. Most infect mammals and birds. Many flaviviruses are host-specific and pathogenic, such as hepatitis C virus in the genus Hepacivirus. The majority of known members in the genus Flavivirus are arthropod borne, and many are important human and veterinary pathogens (e.g. yellow fever virus, dengue virus). This is a summary of the current International Committee on Taxonomy of Viruses (ICTV) report on the taxonomy of the Flaviviridae, which is available at www...
January 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28217625/nonhemorrhagic-complications-in-dengue-fever-with-thrombocytopenia
#8
Anirban Mandal, Puneet Kaur Sahi
No abstract text is available yet for this article.
July 2016: Journal of Family Medicine and Primary Care
https://www.readbyqxmd.com/read/28217383/management-dilemmas-in-a-rare-case-of-pituitary-apoplexy-in-the-setting-of-dengue-hemorrhagic-fever
#9
S J Balaparameswara Rao, Amey R Savardekar, B N Nandeesh, A Arivazhagan
BACKGROUND: Pituitary apoplexy occurs due to infarction or hemorrhage, within a pituitary adenoma or a nontumorous pituitary gland and can have catastrophic consequences. Dengue hemorrhagic fever (DHF) is a severe manifestation of the spectrum of dengue virus infection and is characterized by high-grade fever, thrombocytopenia, hemorrhagic tendencies, and increased vascular permeability. Cases of incidentalomas complicated by DHF and presenting with apoplexy are extremely rare. CASE DESCRIPTION: We describe the case of a 45-year-old gentleman who suffered an attack of pituitary apoplexy while being treated for DHF...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28215143/identifying-the-main-mosquito-species-in-the-taiwan-strait-using-dna-barcoding
#10
Bo Gao, Yiliang Fang, Jianqing Zhang, Rongquan Wu, Baohai Xu, Lianhui Xie
Mosquitoes can transmit many types of viruses such West Nile virus and Zika virus and are responsible for virus-causing diseases including malaria, Dengue fever, yellow fever, lymphatic filariasis, and Japanese B encephalitis. On January 19, 2016, the first case of Zika virus infection was identified in Taiwan, which presents the need for studying the mosquito species in the Taiwan Strait and evaluating the risk of the outbreak of this infection. In this study, we collected a total of 144 specimens from 42 mosquito specimens belonging to 9 genera from both sides of the Taiwan Strait during 2013 and 2014...
February 17, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28214373/improved-detection-of-zika-virus-rna-in-human-and-animal-specimens-by-a-novel-highly-sensitive-and-specific-real-time-rt-pcr-assay-targeting-the-5-untranslated-region-of-zika-virus
#11
Jasper Fuk-Woo Chan, Cyril Chik-Yan Yip, Kah-Meng Tee, Zheng Zhu, Jessica Oi-Ling Tsang, Kenn Ka-Heng Chik, Terance Gi-Wai Tsang, Chris Chung-Sing Chan, Vincent Kwok-Man Poon, Siddharth Sridhar, Feifei Yin, Ivan Fan-Ngai Hung, Sandy Ka-Yee Chau, Anna Jinxia Zhang, Kwok-Hung Chan, Kwok-Yung Yuen
OBJECTIVE AND METHOD: We developed and evaluated five novel real-time RT-PCR assays targeting conserved regions in the 5'-untranslated region (5'-UTR), envelope (E'), non-structural protein 2A (NS2A), NS5, and 3'-UTR of the ZIKV genome. RESULTS: The ZIKV-5'-UTR assay exhibited the lowest in-vitro limit of detection (5-10 RNA copies/reaction and 3.0×10(-1) plaque-forming units/ml). Compared to the modified version of a widely adopted RT-PCR assay targeting the ZIKV-E gene, the ZIKV-5'-UTR assay showed better sensitivity in human clinical specimens, and representative mouse specimens, including many organs which are known to be involved in human ZIKV infection but difficult to obtain in clinical settings...
February 18, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28207988/the-role-of-the-unfolded-protein-response-in-dengue-virus-pathogenesis
#12
REVIEW
Nilanka Perera, Joanna L Miller, Nicole Zitzmann
Symptomatic dengue virus (DENV) infections range from mild fever to severe haemorrhagic disease and death. Host-viral interactions play a significant role in deciding the fate of the infection. The unfolded protein response (UPR) is a pro-survival cellular reaction induced in response to DENV mediated ER stress. The UPR has complex interactions with the cellular autophagy machinery, apoptosis and innate immunity. DENV has evolved to manipulate the UPR to facilitate its replication and to evade host immunity...
February 16, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28207332/leaking-containers-success-and-failure-in-controlling-the-mosquito-aedes-aegypti-in-brazil
#13
Ilana Löwy
In 1958, the Pan American Health Organization declared that Brazil had successfully eradicated the mosquito Aedes aegypti, responsible for the transmission of yellow fever, dengue fever, chikungunya, and Zika virus. Yet in 2016 the Brazilian minister of health described the situation of dengue fever as "catastrophic." Discussing the recent epidemic of Zika virus, which amplified the crisis produced by the persistence of dengue fever, Brazil's president declared in January 2016 that "we are in the process of losing the war against the mosquito Aedes aegypti...
February 16, 2017: American Journal of Public Health
https://www.readbyqxmd.com/read/28203393/a-new-approach-to-detect-epidemic-of-dhf-by-combining-arima-model-and-adjusted-tukey-s-control-chart-with-interpretation-rules
#14
REVIEW
Jatupat Mekparyup, Kidakan Saithanu
The aim of this study was to propose a new method to detect the epidemic of dengue hemorrhagic fever (DHF) using seasonal autoregressive integrated moving average model [ARIMA(1,0,2)(0,1,2)12] with no constant and adjusted Tukey's control chart and the results obtained were interpreted using seventh interpretation rule. Data on the number of DHF cases in Chonburi reported during 2007-2013 were used. The results indicated that this new approach efficiently detected the epidemic of DHF in October 2015 with the forecasted number of DHF (257 cases) and root-mean-squared error (RMSE = 46...
September 2016: Interventional Medicine & Applied Science
https://www.readbyqxmd.com/read/28202077/repellent-effects-of-the-essential-oils-of-cymbopogon-citratus-and-tagetes-minuta-on-the-sandfly-phlebotomus-duboscqi
#15
Albert Kimutai, Moses Ngeiywa, Margaret Mulaa, Peter G N Njagi, Johnstone Ingonga, Lydia B Nyamwamu, Cyprian Ombati, Philip Ngumbi
BACKGROUND: The sandfly, Phlebotomus duboscqi is a vector of zoonotic cutaneous leishmaniasis (ZCL) that is an important public health problem in Eastern Africa. Repellents have been used for protection of humans against vectors of ZCL and other vectors that transmit killer diseases including malaria, Rift Valley fever, dengue, and yellow fever. The repellent effects of different doses of the essential oils from the lemon grass, Cymbopogon citratus and Mexican marigold, Tagetes minuta were evaluated in a two-chamber bioassay against 3- to 7-day-old unfed females of P...
February 15, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28198548/phylogenetic-characterization-of-circulating-dengue-and-alkhumra-hemorrhagic-fever-viruses-in-western-saudi-arabia-and-lack-of-evidence-of-zika-virus-in-the-region-a-retrospective-study-2010-2015
#16
Moneerah S Al-Saeed, Sherif A El-Kafrawy, Suha A Farraj, Tagreed L Al-Subhi, Norah A Othman, Arwa Alsultan, Huda G Ben Helaby, Mustafa M Alshawdari, Ahmed M Hassan, Remi N Charrel, Esam I Azhar, Anwar M Hashem
Flaviviruses represent a global public health concern. They consist of ∼70 viruses with almost half of them causing human diseases with unspecified febrile illnesses. Cities in western Saudi Arabia are endemic for viruses (DENV) with sporadic infections due to Alkhumra hemorrhagic fever virus (AHFV). They also represent a major destination for travelers coming for annual religious pilgrimages (Hajj and Umrah) from all over the world. However, whether other flaviviruses are circulating is not known because of the limited number of surveillance studies...
February 15, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28196111/epidemiological-assessment-of-the-severity-of-dengue-epidemics-in-french-guiana
#17
Claude Flamand, Camille Fritzell, Christelle Prince, Philippe Abboud, Vanessa Ardillon, Luisiane Carvalho, Magalie Demar, Rachida Boukhari, Martine Papaix-Puech, Narcisse Elenga, Dominique Rousset, Séverine Matheus, Mathieu Nacher, Philippe Quenel, Félix Djossou
BACKGROUND: Dengue fever is the most important arboviral infection that affects humans, particularly in tropical and subtropical regions. Here, we provide the first comprehensive overview of the severity of dengue epidemics in French Guiana. METHODOLOGY/PRINCIPAL FINDINGS: We monitored hospitalized cases between 2008 and 2013. Detailed clinical features and biological parameters were collected on a daily basis from all cases. Among the 1,356 cases, 216 (16%) were classified according to the WHO 2009 classification as dengue without warning signs (WS), 926 (68%) were classified as dengue with WS and 214 (16%) were classified as severe dengue...
2017: PloS One
https://www.readbyqxmd.com/read/28194661/guillain-barre-syndrome-complicating-chikungunya-virus-infection
#18
Ayush Agarwal, Deepti Vibha, Achal Kumar Srivastava, Garima Shukla, Kameshwar Prasad
Chikungunya virus (CHIKV) is a mosquito-borne alphavirus which presents with symptoms of fever, rash, arthralgia, and occasional neurologic disease. While outbreaks have been earlier reported from India and other parts of the world, the recent outbreak in India witnessed more than 1000 cases. Various systemic and rarely neurological complications have been reported with CHIKV. We report two cases of Guillain-Barré syndrome (GBS) with CHIKV. GBS is a rare neurological complication which may occur after subsidence of fever and constitutional symptoms by several neurotropic viruses...
February 13, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28193291/meteorological-variables-and-mosquito-monitoring-are-good-predictors-for-infestation-trends-of-aedes-aegypti-the-vector-of-dengue-chikungunya-and-zika
#19
Danielle Andreza da Cruz Ferreira, Carolin Marlen Degener, Cecilia de Almeida Marques-Toledo, Maria Mercedes Bendati, Liane Oliveira Fetzer, Camila P Teixeira, Álvaro Eduardo Eiras
BACKGROUND: Aedes aegypti is an important vector for arboviroses and widely distributed throughout the world. Climatic factors can influence vector population dynamics and, consequently, disease transmission. The aim of this study was to characterize the temporal dynamics of an Ae. aegypti population and dengue cases and to investigate the relationship between meteorological variables and mosquito infestation. METHODS: We monitored and analyzed the adult female Ae...
February 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28193261/prevalence-of-dengue-and-diversity-of-cultivable-bacteria-in-vector-aedes-aegypti-l-from-two-dengue-endemic-districts-kanchanpur-and-parsa-of-nepal
#20
Srinivas Thapa, Narayan Dutt Pant, Rojina Shrestha, Ganga Gc, Bidya Shrestha, Basu Dev Pandey, Ishan Gautam
BACKGROUND: Dengue fever, an endemic arboviral disease, represents one of the major public health concerns in Nepal. It is transmitted by bites of infected Aedes aegypti and Aedes albopictus, the former being primary vector. The bacterial community plays a significant role in biology of mosquitoes; however, the bacterial communities of primary vector A. aegypti remain unstudied in Nepal. The study was designed to determine the rate of dengue seropositivity and to explore the bacterial diversity of A...
February 13, 2017: Journal of Health, Population, and Nutrition
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