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Related Concept Videos

Hepatitis01:25

Hepatitis

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. The...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Antiviral Nucleoside Inhibitors01:22

Antiviral Nucleoside Inhibitors

Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Genital Herpes01:23

Genital Herpes

Genital herpes is a sexually transmitted infection primarily caused by herpes simplex virus type 2 (HSV-2), though herpes simplex virus type 1 (HSV-1) is increasingly implicated in genital infections, particularly among younger populations. Transmission occurs mainly through sexual contact, with asymptomatic viral shedding serving as a major route of spread. This characteristic makes HSV-2 difficult to control at a population level, as individuals may unknowingly transmit the virus even in the...

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Related Experiment Video

Updated: Jun 25, 2026

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
11:14

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

Published on: November 7, 2018

Hepatitis B virus genotypes: "clinical & therapeutic implications".

Rajab Ali Khawaja1, Asad Ali Khawaja

  • 1Department of Family & Community Medicine, King Khalid University Hospital, King Saud University, Riyadh, Kingdom of Saudi Arabia.

JPMA. the Journal of the Pakistan Medical Association
|March 6, 2009
PubMed
Summary

Hepatitis B virus (HBV) genotypes impact public health in Pakistan. This review covers HBV epidemiology, clinical outcomes, and treatment responses across different genotypes.

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Last Updated: Jun 25, 2026

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection
11:14

Detection of Low Copy Number Integrated Viral DNA Formed by In Vitro Hepatitis B Infection

Published on: November 7, 2018

Modeling Hepatitis B Virus Infection in Non-Hepatic 293T-NE-3NRs Cells
09:02

Modeling Hepatitis B Virus Infection in Non-Hepatic 293T-NE-3NRs Cells

Published on: June 5, 2020

Area of Science:

  • Virology
  • Public Health
  • Genetics

Background:

  • Hepatitis B virus (HBV) poses a significant public health challenge globally and in Pakistan.
  • HBV is classified into eight genotypes (A-H) based on genomic variations.
  • Genotype-specific characteristics influence disease progression and treatment efficacy.

Purpose of the Study:

  • To review the epidemiology of different Hepatitis B virus genotypes in Pakistan.
  • To discuss the clinical outcomes associated with various HBV genotypes.
  • To examine the response to antiviral therapy across different HBV genotypes.

Main Methods:

  • This is a review article.
  • Literature search on HBV genotypes, epidemiology, clinical outcomes, and antiviral response.
  • Synthesis of existing data and research findings.

Main Results:

  • HBV genotypes exhibit distinct geographical distributions.
  • Genotype prevalence and characteristics vary within Pakistan.
  • Clinical outcomes and treatment responses differ among HBV genotypes.

Conclusions:

  • Understanding HBV genotype distribution is crucial for public health strategies in Pakistan.
  • Tailoring antiviral therapy based on genotype may improve patient outcomes.
  • Further research is warranted to elucidate genotype-specific disease mechanisms and treatment optimization.