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Vaccinations

Vaccinations

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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...

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Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...

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Portable Paper-Based Immunoassay Combined with Smartphone Application for Colorimetric and Quantitative Detection of Dengue NS1 Antigen

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Current issues in dengue vaccination.

Stephen J Thomas¹, Timothy P Endy

¹Department of Virology, Walter Reed Army Institute of Research, USA.

Current Opinion in Infectious Diseases

|August 22, 2013

Summary

This summary is machine-generated.

Developing an effective dengue vaccine faces significant hurdles. Challenges include complex immune responses and a lack of protective correlates, delaying licensure of new dengue vaccines.

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Published on: November 1, 2018

Area of Science:

Virology
Immunology
Public Health

Background:

Dengue viruses (DENVs) are mosquito-borne flaviviruses causing significant global health burden, with an estimated 390 million infections annually.
Severe dengue illness involves intravascular volume depletion and hemorrhage, posing a critical threat to public health.
Currently, no licensed antivirals or vaccines exist for dengue prevention or treatment, despite ongoing research.

Purpose of the Study:

To review the current challenges and issues in the development of a tetravalent dengue vaccine.
To highlight the complexities hindering the licensure of effective dengue vaccines.

Main Methods:

This is a review article, synthesizing current knowledge on dengue vaccine development.
The review focuses on analyzing the scientific and immunological challenges encountered in clinical trials.

Main Results:

Dengue vaccine development is impeded by immunologic complexity, lack of adequate animal models, and absence of a clear immune correlate of protection.
Partially informative immunogenicity assays further complicate the assessment of vaccine efficacy.
Recent phase 2b trial results underscore the difficulties in developing a successful dengue vaccine.

Conclusions:

Numerous complex challenges must be addressed before a well-tolerated and effective dengue vaccine can be licensed.
Overcoming these obstacles is crucial for public health, especially for travelers and military personnel in endemic areas.