Publications by authors named "Dionisius Denis"

Article Synopsis
  • - The study investigates how prior infections with one of the four dengue virus serotypes influence the immune response to secondary infections, specifically looking at cases from a dengue outbreak in Bali, Indonesia in 2022.
  • - Patients with a history of DENV-1 infection showed a higher risk of severe infection from DENV-3 due to cross-reactive antibodies that weren't very effective at neutralizing DENV-3.
  • - The results highlight that immunity from one serotype offers limited protection against others, complicating our understanding of dengue immunity and impacting strategies for vaccine development in regions where multiple serotypes circulate.
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Background: Typical symptoms of uncomplicated dengue fever (DF) include headache, muscle pains, rash, cough, and vomiting. A proportion of cases progress to severe dengue hemorrhagic fever (DHF), associated with increased vascular permeability, thrombocytopenia, and hemorrhages. Progression to severe dengue is difficult to diagnose at the onset of fever, which complicates patient triage, posing a socio-economic burden on health systems.

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Article Synopsis
  • East Nusa Tenggara in Indonesia has low dengue incidence despite frequent epidemics in other regions, prompting a study in Kupang to understand local trends.
  • From May 2016 to September 2017, researchers found that 52% of the 119 dengue patients were confirmed, with children under 10 being the most affected and mild symptoms prevailing.
  • The study revealed that all dengue virus serotypes were present, with DENV-3 being the most common, and the findings suggest that endemic strains may be contributing to the region's low dengue incidence, providing insights for future disease management.
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Objectives: Dengue is endemic to Indonesia, a country that has largely varied geographical and demographic conditions across different regions. In 2019, dengue epidemic occurred in North Kalimantan province and recorded as the highest incidence rate in Indonesia. This study aims to investigate the molecular epidemiology of dengue during outbreak in the province and compare the epidemiological characteristics between two cities/towns in North Kalimantan, namely Malinau, an inland town surrounded by a dense rainforest, and Tarakan, an island city.

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Chikungunya (CHIK) is a reemerging arboviral disease caused by chikungunya virus (CHIKV) infection. The disease is clinically hallmarked by prolonged debilitating joint pain. Currently, there is no specific antiviral medication nor commercial vaccine available for treatment of the disease, which makes the discovery or development of specific anti-CHIKV compounds a priority.

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Background: In early 2019, an outbreak of severe dengue was reported in Manado, North Sulawesi Province, Indonesia. This epidemic raised public concern and recorded the highest number of cases in the last 10 years. This study aimed to determine the clinical spectrum, disease aetiology and virological characteristics associated with this outbreak of severe dengue.

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Background: Chikungunya virus (CHIKV) is an important emerging and re-emerging public health problem worldwide. In Indonesia, where the virus is endemic, epidemiological information from outside of the main islands of Java and Bali is limited.

Methodology/principal Findings: Four hundred and seventy nine acutely febrile patients presenting between September 2017-2019 were recruited from three city hospitals situated in Ambon, Maluku; Banjarmasin, Kalimantan; and Batam, Batam Island as part of a multi-site observational study.

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The people of Indonesia have been afflicted by dengue, a mosquito-borne viral disease, for over 5 decades. The country is the world's largest archipelago with diverse geographic, climatic, and demographic conditions that may impact the dynamics of disease transmissions. A dengue epidemiology study was launched by us to compare and understand the dynamics of dengue and other arboviral diseases in three cities representing western, central, and eastern Indonesia, namely, Batam, Banjarmasin, and Ambon, respectively.

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Article Synopsis
  • Indonesia has a high prevalence of dengue, and clinicians are using NS1 antigen detection tests to confirm infections, but many brands haven't been properly evaluated.
  • A study tested the accuracy of 5 NS1 rapid test brands against confirmed dengue samples, finding sensitivity between 73%-80% and 100% specificity.
  • The tests perform best within the first 4 days of fever, especially for DENV-3 serotype and primary infections, but factors like age and immunologic status can impact their accuracy.
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Background: Curcumin has been used as a traditional medicine showing antiinflammatory, antimicrobial, and antiviral properties. Despite the promising potentials, curcumin-based drug development is hindered due to its poor solubility and cell uptake.

Objective: This study aims to produce curcumin nanoemulsion (nanocurcumin) and evaluate its physical characteristics and in vitro cell cytotoxicity and antiviral activity against dengue virus (DENV).

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The hyper-endemicity of dengue in Indonesia poses a significant threat of dengue virus (DENV) vertical transmission during pregnancy. A 29-year-old female at 38 weeks of pregnancy presented to hospital with acute fever and later confirmed with DENV infection. Due to signs of fetal distress, the neonate was delivered by emergency caesarean section.

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Article Synopsis
  • Dengue fever, caused by the dengue virus (DENV), significantly increased in East Kalimantan, Indonesia, during 2015-2016, making this region understudied despite being one of the highest in dengue incidence in the country.
  • A clinical and molecular study was conducted in Samarinda and Balikpapan, where 300 patients were examined; 132 were confirmed with dengue, predominantly presenting as dengue hemorrhagic fever.
  • Phylogenetic analysis identified multiple DENV serotypes, with DENV-3 being the most common, indicating that low herd immunity and virus introductions likely contributed to the outbreak.
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Background: Dengue is hyper-endemic in Indonesia. Purwokerto city in Central Java province is routinely ravaged by the disease. Despite the endemicity of dengue in this city, there is still no data on the virological aspects of dengue in the city.

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