Viral Transport Media (VTM)- Principle, Preparation, Uses, Limitations

Viral Transport Media (VTM)

Viral Transport Media (VTM) Definition A viral transport media (VTM) is a nutrient substance used to carry and maintain the viability of specimens (viruses) to a laboratory for the identification and further processing of the sample. Transport media for viruses are especially important as they are more labile than other infectious agents. The probability of successful isolation increases when the …

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Hanta Virus- An Overview

Hanta Virus

Structure of Hanta Virus Source: Viral Zone Hantavirus falls under the Bunyaviridae family. The virion displays round or pleomorphic morphology with a diameter of roughly 120-160 nm. The virus capsid is enveloped by a single layer envelope. The envelope surrounds three nucleocapsids and has surface projections. Surface projections are distinctive spikes which are surrounded by a prominent fringe embedded in a …

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Human Cytomegalovirus- An Overview

Structure of Human Cytomegalovirus Figure: Structure of Human Cytomegalo Virus, Source: Dr. Marko Reschke, Marburg, Germany Cytomegalovirus is a member of the herpes virus family that falls under the beta herpes subfamily. CMV is spherical in shape with icosahedral symmetry. The icosahedral protein capsid with an average diameter of 100 nm consists of 162 hollow hexagonal and pentagonal capsomeres with …

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Measles Virus- An Overview

Measles Virus

Measles Virus Image Source: BBC Structure Measles virus is the prototypic member of the Morbillivirus genus of the family Paramyxoviridae. Measles virus is spherical with a diameter ranging from 100 to 300 nm and has two major structural components: one is the helical ribonucleoprotein (RNP) core formed by the association of the nucleoprotein (N), phosphoprotein (P) and large protein (L) …

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Coronavirus- An Overview

Coronavirus

Structure of Coronavirus Coronaviruses fall in the virus family Coronaviridae, order Nidovirales. Coronaviruses are enveloped, 120 to 160 nm particles that contain an unsegmented genome of single-stranded positive-sense RNA (27–32 kb). The large, plus-stranded RNA genome associates with the N protein to form a helical nucleocapsid. The helical nucleocapsid is 9–11 nm in diameter. There are 20 nm long club or …

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Varicella Zoster Virus- An Overview

Varicella Zoster Virus

Structure of Varicella Zoster Virus Image Source: Creative Diagnostics Varicella-zoster virus (VZV) is an alphaherpesvirus that is in the same subfamily as herpes simplex virus (HSV) 1 and 2. VZV is a member of varicellovirus genus. The virion is spherical in shape with icosahedral symmetry measuring 159-200nm. The icosahedral protein capsid with average diameter 100 nm consists of 162 hollow …

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Mumps Virus- An Overview

Mumps Virus

Structure of Mumps Virus Mumps virions are markedly pleomorphic (100 to 600 nm), and roughly spherical with an outer membrane that envelops an inner, coiled helical structure. The envelope which is 150 to 300nm is studded with projections formed by the viral glycoproteins that rise 12 to 15 nm from the virion surface. The coiled inner structure or nucleocapsid is …

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Mutation- Causes, Mechanisms, Agents and Significance

Mutation- Causes, Mechanisms, Agents and Significance

Mutation is a process that produces a gene or chromosome that differs from the wild type (arbitrary standard for what “normal” is for an organism). It is most commonly defined as a spontaneous permanent change in a gene or chromosome which usually produces a detectable effect in the organism concerned and is transmitted to the offsprings. Mutated gene or chromosome …

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28 Differences Between Bacteria and Virus (Bacteria vs Virus)

Differences Between Bacteria and Virus

Differences Between Bacteria and Virus Some of the differences between bacteria and virus are as follows: S.N. Character Bacteria Virus 1 Cell type Prokaryotic cells Acellular 2 Number of cells Single-celled No cell 3 Size Larger than viruses (0.3-2 μ) Minute (0.02-0.3 μ) 4 Microscopy Visible under Light Microscope. Visible only under an Electron Microscope. 5 Shape  Common bacterial cell …

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Lassa Virus- An Overview

Lassa Virus

Structure of Lassa Virus The virus is a single-stranded RNA virus belonging to the virus family Arenaviridae. Figure: Structure of Lassa Virus, Source: Swiss Institute of Bioinformatics The virion is spherical particles with an average diameter of 90–110 nm. Lassa virus is a single-stranded RNA virus that is enveloped in lipid with glycoprotein spikes protruding from the outside surface. Glycoproteins on …

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