Table of Contents
Do animal viruses have DNA?
Like other viruses, animal viruses are tiny packages of protein and nucleic acid. They have a protein shell, or capsid, and genetic material made of DNA or RNA that’s tucked inside the caspid. They may also feature an envelope, a sphere of membrane made of lipid.
Which viruses are DNA viruses?
DNA viruses comprise important pathogens such as herpesviruses, smallpox viruses, adenoviruses, and papillomaviruses, among many others.
What are the examples of animal viruses?
Examples include, rabies, yellow fever and pappataci fever. The viruses that infect other vertebrates are related to those of humans and most families of viruses that cause human diseases are represented. They are important pathogens of livestock and cause diseases such as foot-and-mouth disease and bluetongue.
How many families of animal DNA viruses are there?
The Genomes of Animal Viruses Currently eight families of DNA and 16 families of RNA animal viruses are recognized. The genomes of most DNA viruses are double stranded (ds) and range in size from 3.2 to 280 kbp; others have genomes of ssDNA ranging from 1.8 to 5 kb.
Is polio a DNA or RNA virus?
Poliovirus, the prototypical picornavirus and causative agent of poliomyelitis, is a nonenveloped virus with a single-stranded RNA genome of positive polarity. The virion consists of an icosahedral protein shell, composed of four capsid proteins (VP1, VP2, VP3, and VP4), which encapsidates the RNA genome (1).
What is the largest DNA virus?
A. polyphaga Mimivirus is a giant, double-stranded, icosahedral DNA virus. With a diameter of approximately 650 nm, Mimivirus is the largest virus known to date. Morphologically, Mimivirus resembles nucleocytoplasmic large DNA viruses (NCLDVs) such as the Iridovirus, Asfarvirus, and Phycodnavirus.
What is the classification of animal viruses?
Animal viruses can be classified by the nature of the nucleic genome (ie, DNA or RNA). In addition, viruses are often called by their morphological features. For instance, according to the existence of envelope, it can be called either an enveloped virus or naked (nonenveloped virus).
What is the Baltimore classification of animal viruses?
According to the Baltimore classification, animal viruses are subdivided into seven groups: DNA viruses (Group I and II), RNA viruses (Group III, IV, and V), and RT viruses (Group VI and VII). The schematic diagram in Fig. 1.9 illustrates how viruses in each group differently synthesize their mRNAs.
How are animal viruses identified and characterized in aquatic animals?
Aquatic animal viruses are isolated and identified according to standard virological procedures ( Essbauer and Ahne, 2001 ), but culture-dependent characterization is not always possible.
Is shrimpcdv an ssDNA virus?
DNA viruses belonging to papovavirus, adenovirus, hepadnavirus and herpesvirus families have been associated with tumours in man and animals (O’Shea, 2005). ShrimpCDV is a novel virus with similarities to members of the family Circoviridae (genera Circovirus and Cyclovirus) that possess circular ssDNA ( Ng et al., 2013 ).