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Related Concept Videos

Arboviral Encephalitis01:25

Arboviral Encephalitis

52
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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Cholera01:25

Cholera

133
Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...
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Encephalitis l: Introduction01:19

Encephalitis l: Introduction

8
Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
8
Viral Meningitis01:18

Viral Meningitis

179
Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
179
Diphtheria01:28

Diphtheria

164
Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
164

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Related Experiment Video

Updated: Apr 23, 2026

Multiplexed Isothermal Amplification Based Diagnostic Platform to Detect Zika, Chikungunya, and Dengue 1
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[A possible fifth dengue virus serotype].

Júlia M da Silva Voorham1

  • 1Universitair Medisch Centrum Groningen, afd. Medische Microbiologie, Groningen.

Nederlands Tijdschrift Voor Geneeskunde
|September 18, 2014
PubMed
Summary

Researchers identified a potential new dengue virus serotype, DENV-5, in Malaysia. Further research is needed to confirm if it

Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Sylvatic dengue viruses (DENV) are evolutionarily and ecologically distinct from human DENV strains.
  • Sporadic sylvatic DENV infections in humans indicate regular contact between sylvatic and human transmission cycles.
  • The discovery of a potential new serotype, DENV-5, emerged following a 2007 study on sylvatic transmission in Malaysia.

Purpose of the Study:

  • To investigate the potential discovery of a new dengue virus serotype, DENV-5.
  • To assess the implications of a potential new serotype on current dengue control strategies and vaccine development.

Main Methods:

  • Analysis of sylvatic dengue virus transmission cycles.
  • Molecular and serological characterization of isolated DENV strains.

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  • Comparative genomic and phylogenetic studies.

    • Main Results:

    • A novel DENV serotype, tentatively named DENV-5, was reported in Malaysia.
    • Scientific community expresses skepticism, requiring more data to confirm DENV-5 as a distinct serotype versus a variant.
    • Currently, DENV-5 has not established itself in the human transmission cycle.

    Conclusions:

    • Confirmation of DENV-5 as a new serotype requires further extensive research and data.
    • If confirmed, DENV-5 could impact the efficacy of current dengue vaccines under development.
    • Ongoing surveillance of sylvatic DENV is crucial for understanding potential future threats to public health.