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Related Concept Videos

Hepatitis01:25

Hepatitis

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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver.
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Human Virome01:26

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The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible...
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Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

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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...
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Retroviruses02:33

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Related Experiment Video

Updated: Apr 13, 2026

Author Spotlight: Advancements and Challenges in Hepatitis B Virus Detection
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Author Spotlight: Advancements and Challenges in Hepatitis B Virus Detection

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Hepatitis B virus epidemiology.

Jennifer H MacLachlan1, Benjamin C Cowie2

  • 1Epidemiology Unit, Victorian Infectious Diseases Reference Laboratory, Doherty Institute, Melbourne, Victoria 3000, Australia Department of Medicine, University of Melbourne, Melbourne, Victoria 3050, Australia.

Cold Spring Harbor Perspectives in Medicine
|May 3, 2015
PubMed
Summary

Hepatitis B virus (HBV) infection epidemiology varies globally, impacting chronic infection rates and leading to increased liver disease burdens. New international strategies are needed to address this growing global health challenge.

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Area of Science:

  • Hepatology
  • Infectious Diseases
  • Epidemiology

Background:

  • Hepatitis B virus (HBV) infection epidemiology shows significant geographical variation.
  • Factors like prevalence, age, acquisition mode, and chronicity are interdependent.
  • The global burden of chronic HBV, including cirrhosis and liver cancer, is rising.

Purpose of the Study:

  • To highlight the increasing global health impact of hepatitis B.
  • To underscore the need for updated international strategies and policies.

Main Methods:

  • This abstract is based on a review of current epidemiological data and global health recognition of HBV.
  • Analysis of factors influencing chronic HBV outcomes.

Main Results:

  • Chronic HBV infection outcomes are influenced by viral genotype, coinfections, and other liver disease causes.
  • HBV is recognized as a leading global cause of mortality.

Conclusions:

  • Immediate implementation of new international structures and policies is crucial for managing HBV.
  • Addressing the diverse epidemiology and increasing burden of HBV is a global health priority.