Table of Contents
Does poliovirus have envelope?
Poliovirus, of the family Picornaviridae, is a non-enveloped single-stranded positive-sense RNA virus (Racaniello, 2007).
What is the structure of the polio virus?
Polioviruses are single-stranded RNA viruses belonging to the family Picornaviridae. They have a naked protein capsid with a dense central core. The capsid consists of four structural proteins, VP1, VP2, VP3, and VP4. The genomic RNA is approximately 7440 to 7500 nucleotides in length.
What is difference between enveloped and Nonenveloped virus?
Viruses can be divided into two main categories; enveloped viruses, which have a lipid membrane (envelope) that is derived from the host cell; and non-enveloped viruses, which lack a membrane.
How does polio virus enter the cell?
When poliovirus encounters the nerve cells, the protruding receptors attach to the virus particle, and infection begins. Once inside the cell, the virus hijacks the cell’s assembly process, and makes thousands of copies of itself in hours. The virus kills the cell and then spreads to infect other cells.
What viruses are DNA viruses?
DNA viruses comprise important pathogens such as herpesviruses, smallpox viruses, adenoviruses, and papillomaviruses, among many others.
What does the polio virus look like?
Poliovirus is a nonenveloped virus having the shape of an icosahedral capsid (spherical), belonging to the Picornaviridae family. It may cause poliomyelitis (infantile paralysis). The main transmission path is direct or indirect contact with contaminated persons or objects.
What viruses are non-enveloped?
Non-enveloped Viruses However, because they lack a lipid envelope, they more resistant to many disinfectants and other stresses like drying out or heat. Examples of non-enveloped viruses include types that can cause dysentery (Norovirus), common colds (Rhinovirus) and Polio (Poliovirus).
What is the root cause of polio?
What causes polio? A virus called poliovirus causes polio. The virus enters the body through the mouth or nose, getting into the digestive and respiratory (breathing) systems. It multiplies in the throat and intestines.