Результаты поиска

Transmission of epidemic dengue hemorrhagic fever in easternmost Indonesia.

In April 2001, a second suspected outbreak of dengue hemorrhagic fever in the easternmost region of Indonesia was investigated in Merauke, a town located in the southeastern corner of Papua, by the Indonesian Ministry of Health and the U.S. Naval Medical Research Unit No. 2. Principal case criteria of hemorrhagic disease provided for a study enrollment of 15 clinically acute and 37 convalescing subjects. Additionally, 32 comparable age/sex controls were selected from neighboring households. Laboratory diagnosis involved three testing methodologies: virus isolation by cell culture, a reverse tr…

[Prenatal and postnatal effects of dengue infection during pregnancy].

The risk of dengue virus infection during pregnancy has increased due to the current rash of frequent and severe dengue epidemics. The effects of dengue virus in the fetus and newborn children have been studied only superficially and with contradictory results. Therefore, a retrospective cohort study was conducted in Medellin, Colombia, to describe the fetal and postnatal effects of dengue virus infection acquired during pregnancy. Twenty-two babies born from mothers who suffered dengue during the epidemics of 1998 were compared with babies from non-infected mothers. In the exposed cohort, thr…

Activation of coagulation and fibrinolysis during dengue virus infection.

Dengue virus infection can induce mild dengue fever (DF) or severe dengue hemorrhagic fever and dengue shock syndrome (DHF/DSS) in human. The pathogenesis of hemorrhage in dengue virus infection is not fully understood. Since hemostasis depends on the balance between coagulation and fibrinolysis, alternation of some coagulation parameters (platelet count and activated partial thromoboplastin time, APTT) as well as fibrinolytic parameters (tissue plasminogen activator, tPA and plasminogen activator inhibitor-1, PAI-1) were compared in 8 DHF/DSS and 17 DF patients. Patients showed thrombocytopen…

Human dendritic cells as targets of dengue virus infection.

Dengue virus infections are an emerging global threat. Severe dengue infection is manifested as dengue hemorrhagic fever and dengue shock syndrome, both of which can be fatal complications. Factors predisposing to complicated disease and pathogenesis of severe infections are discussed. Using immunohistochemistry, immunofluorescence, flow cytometry, and ELISA techniques, we studied the cellular targets of dengue virus infection, at both the clinical (in vivo) and the laboratory (in vitro) level. Resident skin dendritic cells are targets of dengue virus infection as demonstrated in a skin biopsy…

Cytokine cascade in dengue hemorrhagic fever: implications for pathogenesis.

Dengue virus produces a mild acute febrile illness, dengue fever (DF) and a severe illness, dengue hemorrhagic fever (DHF). The characteristic feature of DHF is increased capillary permeability leading to extensive plasma leakage in serous cavities resulting in shock. The pathogenesis of DHF is not fully understood. This paper presents a cascade of cytokines, that in our view, may lead to DHF. The main feature is the early generation of a unique cytokine, human cytotoxic factor (hCF) that initiates a series of events leading to a shift from Th1-type response in mild illness to a Th2-type respo…

Epidemiologic studies on Dengue in Santiago de Cuba, 1997.

A small, isolated outbreak of dengue hemorrhagic fever/dengue shock syndrome (DHF/DSS) due to dengue virus type 2 (DEN-2) was documented in Santiago de Cuba on the island of Cuba beginning in January 1997. There were 205 DHF/DSS cases, all in persons older than age 15 years. All but three had evidence of a prior dengue infection, with the only known opportunity being the islandwide dengue virus type 1 (DEN-1) epidemic of 1977-1979. Virtually complete clinical and laboratory surveillance of overt disease was achieved. From December 1997 to January 1998, a random, age-stratified serum sample was…

[Dengue fever with neurologic expression. Three cases in adults].

Dengue fever, unlike most other arboviral diseases, does not usually cause encephalitis. However, neurologic symptoms with poor prognosis have been regularly reported, mostly in Asian children affected by the severe dengue hemorrhagic fever/dengue shock syndrome, and attributed to a non specific, anoxic or metabolic encephalopathy. Recently, first isolations of dengue viruses from CSF or brain tissue, have renewed this concept. We report 3 dengue fever cases with neurologic manifestations and favorable outcome. Occurrence in adult age, during classic (benign) dengue fever (2 cases), and neurol…

Dengue fever complicated by pulmonary haemorrhage manifesting as haemoptysis.

A 17-year-old girl was admitted to hospital with dengue fever. On the ninth day of fever she developed haemoptysis and chest X-ray changes consistent with haemorrhage in her lungs. Thrombocytopaenia and mild coagulopathy were the most likely cause of this unusual haemoptysis in this patient. Investigations excluded other causes for the haemoptysis.

T cell-mediated cytotoxicity against dengue-infected target cells.

A cytotoxic T lymphocyte (CTL) response to dengue virus-infected target cells is described. Effector cells were generated in an in vitro secondary culture and appeared to be T cells possessing both the Lyt 1.1 and Lyt 2.1 surface antigens. A stronger CTL response was noted with the H-2k haplotype compared to H-2d, and H-2 compatibility was required between CTL and target cells. CTL generated showed some cross-reactivity with target cells infected with Japanese encephalitis virus (JEV), another flavivirus, but not with target cells infected with an alphavirus, Sindbis. The significance and impo…

Dengue in Bangladesh: From Seasonal Outbreaks to Persistent Threat.

"No Abstract".

Establishment of germline-encoded antibodies during primary dengue infection.

Dengue viruses impose a major global health burden, while imperfect vaccines raise concerns that the immunization of dengue-naïve individuals may exacerbate disease through immunopathologic mechanisms. Using a controlled human challenge model of primary DENV1 infection, we longitudinally profile B cell receptor repertoires in 9 flavivirus-naïve participants. Despite serological features of primary infection, acute responses are dominated by memory-derived clones in 4/9 participants. We also identify public convergent clones from naive B cells that share sequence features across 7 participants …

Hesitancy and Perceptions Regarding Dengue Vaccination Among Educated Ecuadorians.

BACKGROUND: Global dengue cases have surged in recent years. In Ecuador, reported cases increased from 27,906 in 2023 to 57,712 in 2024. Despite the availability of multiple vaccines in other countries, factors such as socioeconomic disparities, climate change, and vaccine hesitancy continue to hinder prevention efforts. This study aims to analyze the perceptions of the Ecuadorian population and explore possible reasons for hesitancy toward the dengue vaccine. METHODS: This cross-sectional observational study was conducted in accordance with the STROBE guidelines. Online surveys, adapted from…

Development of electrochemiluminescence immunochromatographic test strips for dengue virus.

INTRODUCTION: Dengue virus (DENV) infection poses a serious threat to global public health. Rapid and sensitive point-of-care diagnostic methods are urgently needed for early detection and epidemic control. METHODS: The dengue virus monoclonal antibody NS1-McAb1# was labeled as the labeled antibody and sprayed onto the binding pad using ruthenium tripyridine as the signal probe, and the dengue virus monoclonal antibody DN-REAB-G2-006 was fixed on the detection pad as the capture antibody. To mitigate potential interference from other substances in the sample, the sample pad and conjugate pad …

The Links Between Dengue Virus, Climate and Climate Change.

Climate plays a crucial role in shaping dengue virus (DENV) transmission dynamics by influencing directly the physical and behavioural traits of mosquito individuals and viral replication. This chapter describes and evidences the intricate relationships between climate variables, mosquito traits and DENV transmission, highlighting the importance of understanding such connections in the context of a growing DENV burden and a global environmental change.

Innate Immune and Inflammatory Responses to Dengue Virus Infection.

Dengue is the most common arboviral infection in the world, causing up to 400 million cases per year. Although most cases are asymptomatic, the virus can cause a wide range of symptoms varying from high fever and pain, common to several arbovirus infections, to hemorrhagic fever and shock syndrome, which can often be fatal. Despite the association of some genotypes with disease severity, most symptom varieties can be traced to the interaction of the virus with the immune system. As early as viral entry, Dengue virus co-evolved with humans to evade the innate immune system, especially the antiv…

Current status of dengue fever epidemics and vaccine development.

Dengue fever, an acute mosquito-borne infectious disease caused by dengue virus (DENV), is primarily endemic in tropical and subtropical regions. In recent years, the global incidence of dengue has increased dramatically. Since 2023, widespread outbreaks have been reported across numerous countries in the Americas, Asia and Africa. According to the World Health Organization, more than 5 million dengue cases were reported globally in 2023, while the number surged to over 14 million cases with more than 10,000 deaths in 2024-marking the highest global burden ever recorded. A similar upward trend…

Detection of Multiple Dengue Virus Serotypes Circulating in Somalia.

Dengue virus (DENV) is widely distributed across Africa but underreported due to limited surveillance and diagnostic capacity. Under an acute febrile illness surveillance protocol, we collected and screened 374 samples from patients with fever in Mogadishu, Somalia. Samples were screened for DENV serotypes using real-time reverse transcription polymerase chain reaction, and positive samples were sequenced and phylogenetically analyzed. We identified 55 samples containing orthoflavivirus RNA (14.7%). Of these 55 samples, three dengue serotypes, DENV serotype 1 (DENV-1, n = 24), DENV serotype 2 …

Детерминанты изменений денге серотипа: описывающая многофакторная перспектива.

Вирус денге (DENV) циркулирует как четыре антигенно различимых серотипа, доминирующее положение которых с течением времени колеблется во многих эндемических регионах, явление, известное как серотипная смена, которая часто ассоциируется с крупными вспышками и усилением заболеваемости. В этом обзоре, в котором обобщаются эпидемиологические, вирологические, иммунологические, энтомологические и экологические данные, отмечается, что изменение серотипа, вероятно, происходит в результате взаимодействия нескольких факторов, а не только в результате вирусной эволюции, при этом центральную роль играет и

Совпадение в аннотации оригинала
Dengue Virus (DENV) circulates as four antigenically distinct serotypes whose dominance fluctuates over time in many endemic regions, a phenomenon known as serotype shift that is frequently associated with large outbreaks and increased disease severity. This review, through a synthesis of epidemiological, virological, immunological, entomological, and enviro…