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Introduction to Virus

Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...

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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 Virome

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 only with...

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Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...

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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...

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Related Experiment Video

Updated: May 12, 2026

Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm

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Virus discovery: one step beyond.

Saskia L Smits¹, Albert Dme Osterhaus¹

¹ViroClinics Biosciences B.V., Marconistraat 16, 3029 AK Rotterdam, The Netherlands; Department of Virology, Erasmus Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands.

Current Opinion in Virology

|April 13, 2013

Summary

Metagenomics advances aid in identifying new viral pathogens. A multidisciplinary approach integrating clinical assessment, surveillance, and host response is crucial for effective future pandemic preparedness.

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Last Updated: May 12, 2026

Protocols for Investigating the Host-tissue Distribution, Transmission-mode, and Effect on the Host Fitness of a Densovirus in the Cotton Bollworm

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Area of Science:

* Virology
* Genomics
* Infectious Disease Epidemiology

Background:

* Recent advancements in metagenomics have significantly improved the identification and characterization of novel viral pathogens.
* Early detection and understanding of emerging viruses are critical for public health.
* Existing approaches require enhancement to address the complexities of viral threats.

Purpose of the Study:

* To highlight the necessity of an integrated, multidisciplinary strategy for responding to emerging viral threats.
* To emphasize the role of metagenomics in virus discovery and characterization.
* To advocate for a proactive and expanded role of the scientific community in virus discovery.

Main Methods:

* Review and synthesis of recent findings in metagenomics and viral pathogen identification.
* Analysis of the components required for an effective response to viral threats.
* Examination of the contributions of various scientific disciplines, including clinical assessment, virus surveillance, pathogenesis, and host response.

Main Results:

* Metagenomic techniques offer powerful tools for rapid identification of new viruses.
* A comprehensive approach encompassing clinical, epidemiological, and molecular aspects is essential.
* Enhanced collaboration across disciplines is needed to strengthen global health security.

Conclusions:

* The scientific community must advance beyond current virus discovery methods.
* Integrated strategies are paramount for timely and effective responses to emerging viral diseases.
* Continued innovation in metagenomics and related fields will bolster pandemic preparedness.