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 the shape and structure of polio?
Poliovirus is a nonenveloped virus having the shape of an icosahedral capsid (spherical), belonging to the Picornaviridae family.
What are three facts about polio?
Five fast facts about polio
- Polio is a highly contagious virus.
- Polio can strike at any age, but it mainly affects children under five.
- Most people infected with polio have no signs of illness.
- Unlike most diseases, polio can be completely eradicated.
- COVID-19 is disrupting life-saving immunization services.
What are the 3 types of polio virus?
There are three wild types of poliovirus (WPV) – type 1, type 2, and type 3.
Who invented polio vaccine?
The discovery that the various antigenic strains of PVs could be grouped into three distinct viral types and the propagation of the PV in vitro led to the development of the vaccines against poliomyelitis: the formalin-inactivated vaccine (IPV) by Jonas Salk (1953) and the live-attenuated vaccines (OPV) by Albert Sabin …
Is polio virus lytic or lysogenic?
One such virus, poliovirus (PV), is an extremely lytic RNA virus that requires the expression of CD155, the poliovirus receptor (PVR), for infection.
Is polio viruses linear or circular?
In general, the capsids of viruses are classified into four groups: helical, icosahedral, enveloped, and head-and-tail. Helical capsids are long and cylindrical. Many plant viruses are helical, including TMV. Icosahedral viruses have shapes that are roughly spherical, such as those of poliovirus or herpesviruses.
Was polio a virus or bacteria?
Polio is a viral disease which may affect the spinal cord causing muscle weakness and paralysis. The polio virus enters the body through the mouth, usually from hands contaminated with the stool of an infected person.
Is polio a Indian?
Within two decades, India received ‘Polio-free certification’ from World Health Organization on the 27 March 2014, with the last polio case being reported in Howrah in West Bengal on 13 January 2011.
How did we stop polio?
Thanks to the polio vaccine, dedicated health care professionals, and parents who vaccinate their children on schedule, polio has been eliminated in this country for more than 30 years. This means that there is no year-round transmission of poliovirus in the United States.
Who made polio virus?
The first polio vaccine, known as inactivated poliovirus vaccine (IPV) or Salk vaccine, was developed in the early 1950s by American physician Jonas Salk.