Positive staining of Viruses

Positive staining of Viruses

What is positive staining? Positive staining of viruses is similar to negative staining. The difference is that the virus image is darker formed on a light background, unlike the negative staining where a light viral particle image is formed on … Read more

Prevention and Control of COVID-19

Prevention and Control of COVID-19 (SARS-CoV-2)

Since there is currently no vaccine to prevent coronavirus disease (COVID-19), the best way to prevent illness is to avoid being exposed to this virus. As the primary mode of transmission is droplet transmission, the preventive measures revolve around the … Read more

Electron microscopy (SEM and TEM) images of SARS-CoV-2

Electron microscopy images of SARS-CoV-2

Here are some of the electron microscopy images (Scanning Electron Micrograph and Transmission Electron Micrograph) of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) that causes Coronavirus Disease 2019 (COVID-19). More Images at https://www.flickr.com/photos/niaid/albums/72157712914621487/

Signs and Symptoms of COVID-19 with Risk factors

Signs and Symptoms of COVID-19

Coronavirus disease 2019 (COVID-19) is an infectious respiratory tract infection caused by SARS-CoV-2. The mode of transmission for this disease is through close physical contact and small droplets that develop during coughing, sneezing, and even talking. Even though these droplets … Read more

Structure and Genome of SARS-CoV-2 (COVID-19) with diagram

Structure and Genome of SARS-CoV-2 (COVID-19) with diagram

Coronaviruses (CoVs) are enveloped positive sense, single-stranded RNA viruses that belong to the subfamily Coronavirinae, family Coronavirdiae, order Nidovirales. Four genera of CoVs, namely, Alphacoronavirus (αCoV), Betacoronavirus (βCoV), Deltacoronavirus (δCoV), and Gammacoronavirus (γCoV), are distinguished. This group of viruses is … Read more

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 … Read more

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. … Read more

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 … Read more

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 … Read more

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 … Read more

Oncogenic Viruses- An Overview

Oncogenic Viruses

Viruses are intracellular pathogens that reproduce only in the living cell and manipulate the cellular machinery to produce more viruses. Viral replications can affect the cellular genes of the host in multiple cancerous ways. An oncovirus is a virus that can cause cancer. Viruses account … Read more

Classification of virus

Baltimore Classification

Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses range from the structurally simple and small parvoviruses and picornaviruses to the large and complex poxviruses … Read more

Virus Cultivation- Purposes and Methods

Virus Cultivation- Purposes and Methods

Viruses are obligate intracellular parasites so they depend on host for their survival. They cannot be grown in non-living culture media or on agar plates alone, they must require living cells to support their replication. The primary purposes of virus … Read more

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 … Read more