In this article we will discuss about the structure and replication of pox viruses. Structure of Pox Viruses: Oval or brick-shaped 200-400 nm long particles can be visualized by the best light microscopes. The external surface is ridged in parallel rows, sometimes arranged helically (Fig. 17.17). Viral particles (virions) are generally enveloped (external enveloped virion-EEV). The intracellular mature virion (IMV) [...]
In this article we will discuss about:- 1. Structure of HIV 2. Genome Organization of HIV-1 3. Steps of Entry 4. Replication 5. Assembly. Structure of HIV: HIV is different in structure from other retroviruses. HIV is of 100-120 nm diameters containing an protein envelope to which spicules of glycoprotein are attached. The envelope encloses an icosahedral capsid core that [...]
In this article we will discus about the classification of animal viruses. Baltimore (2008) classified the animal viruses in the following seven groups according to the relationships between virion, nucleic acid and mRNA transcription Table (17.1). The RNA within the virion is known as plus (+) or sense strand because it acts as mRNA, whereas the newly synthesized RNA which [...]