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Dengue fever

About: Dengue fever is a research topic. Over the lifetime, 17463 publications have been published within this topic receiving 485745 citations. The topic is also known as: Dengue & dengue disease.


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Journal ArticleDOI
TL;DR: This analysis reveals that dengue virus generally evolves according to a molecular clock, although some serotypes-specific and genotype-specific rate differences were observed, and that its origin is more recent than previously suggested, with the virus appearing approximately 1,000 years ago.
Abstract: Dengue is often referred to as an emerging disease because of the rapid increases in incidence and prevalence that have been observed in recent decades. To understand the rate at which genetic diversification occurs in dengue virus and to infer the time-scale of its evolution, we employed a maximum likelihood method that uses information about times of virus sampling to estimate the rate of molecular evolution in a large number of viral envelope (E) gene sequences and to place bounds around the dates of appearance of all serotypes and specific genotypes. Our analysis reveals that dengue virus generally evolves according to a molecular clock, although some serotype-specific and genotype-specific rate differences were observed, and that its origin is more recent than previously suggested, with the virus appearing approximately 1,000 years ago. Furthermore, we estimate that the zoonotic transfer of dengue from sylvatic (monkey) to sustained human transmission occurred between 125 and 320 years ago, that the current global genetic diversity in the four serotypes of dengue virus only appeared during the past century, and that the recent rise in genetic diversity can be loosely correlated both to human activities such as population growth, urbanization, and mass transport and to the emergence of dengue hemorrhagic fever as a major disease problem.

229 citations

01 Jan 1989
TL;DR: Based on the observation of 11 patients (10 males and 1 female), the occurrence of hemorrhagic fever with renal syndrome in two new geographic areas of Romania is reported, two patients died within several hours after admission and four patients recovered gradually.
Abstract: Hantaviruses, the causative agents of HFRS, have become more widely recognized. Epidemiologic evidence indicates that these pathogens are distributed worldwide. People who come into close contact with infected rodents in urban, rural and laboratory environments are at particular risk. Transmission to man occurs mainly via the respiratory tract. The epidemiology of the hantaviruses is intimately linked to the ecology of their principal vertebrate hosts. Four distinct viruses are now recognized within the hantavirus genus and that number is likely to increase to six very soon; however, further investigations are necessary. Much more work is still needed before we fully understand the wide spectrum of clinical signs and symptoms of HFRS as well as the pathogenicity of the different viruses in the hantavirus genus of the Bunyaviridae family. HFRS is difficult to diagnose on clinical grounds alone and serological evidence is often needed. A fourfold rise in IgG antibody titer in a 1-week interval, and the presence of the IgM type of antibodies against hantaviruses are good evidence for an acute hantavirus infection. Physicians should be alert for HFRS each time they deal with patients with acute febrile flu-like illness, renal failure of unknown origin and sometimes hepatic dysfunction. Especially the mild form of HFRS is difficult to diagnose. Acute onset, headache, fever, increased serum creatinine, proteinuria and polyuria are signs and symptoms compatible with a mild form of HFRS. Differential diagnosis should be considered for the following diseases in the endemic areas of HFRS: acute renal failure, hemorrhagic scarlet fever, acute abdomen, leptospirosis, scrub typhus, murine typhus, spotted fevers, non-A, non-B hepatitis, Colorado tick fever, septicemia, dengue, heartstroke and DIC. Treatment of HFRS is mainly supportive. Recently, however, treatment of HFRS patients with ribavirin in China and Korea, within 7 days after onset of fever, resulted in a reduced mortality as well as shortened course of illness.

229 citations

Journal ArticleDOI
TL;DR: Data suggest that at least one factor controlling the susceptibility of A. albopictus to CHIK infection is genetic, and that increasingly resistant or susceptible mosquito lines through genetic selection were unsuccessful.
Abstract: The comparative susceptibility to dengue virus infection of 13 geographic strains of Aedes albopictus was studied by feeding the mosquitoes on a virus-erythrocyte-sugar suspension. Significant variation in susceptibility for each of the four dengue serotypes was observed among the geographic strains. Mosquito strains which were more susceptible to infection with one dengue serotype also were more susceptible to the other dengue serotypes. There was a direct relationship between the amount of virus ingested and the infection rate in a given mosquito strain. A 100-fold difference in oral ID50 was noted between the most and the least susceptible strains. Crossing experiments between susceptible and resistant mosquito strains produced hybrid progeny with intermediate susceptibility. Susceptibility to infection by dengue 2 virus was decreased by selective inbreeding in one strain from 74% to 13% in two generations. Further selection, however, failed to produce a completely resistant line. It appeared that the actual “barrier” to infection was in the mosquito midgut.

228 citations

Journal ArticleDOI
05 Jan 2002-Virology
TL;DR: Using infectious virus, the present work shows the importance of heparan sulfate in binding and infection of these two flaviviruses.

228 citations

Journal ArticleDOI
TL;DR: Data suggest NS1 assays deserve inclusion in the diagnostic evaluation of dengue patients, but with due consideration for the limitations in patients who present late in their illness or have a concomitant humoral immune response.
Abstract: Background Dengue is a public health problem in many countries. Rapid diagnosis of dengue can assist patient triage and management. Detection of the dengue viral protein, NS1, represents a new approach to dengue diagnosis.

228 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,464
20222,917
2021992
20201,237
20191,168