How many polio variants are there?

How many polio variants are there?

There are three serotypes of wild poliovirus type 1, type 2, and type 3 each with a slightly different capsid protein. Immunity to one serotype does not give confer immunity to the other two. Outbreaks of poliovirus were largely unknown prior to the 20th century.

How did polio get transmitted?

Poliovirus only infects people. It enters the body through the mouth and spreads through: Contact with the feces (poop) of an infected person. Droplets from a sneeze or cough of an infected person (less common).

Is polio a communicable disease?

What is polio? Poliomyelitis (polio) is a highly infectious disease caused by a virus. It invades the nervous system and can cause total paralysis in a matter of hours. The virus is transmitted from person to person mainly through the faecal–oral route.

What are the 3 strains of poliovirus?

There are three individual and immunologically-distinct wild poliovirus strains: wild poliovirus type 1 (WPV1), wild poliovirus type 2 (WPV2) and wild poliovirus type 3 (WPV3). Symptomatically, all three strains are identical, in that they cause irreversible paralysis or even death.

Where did polio virus came from?

The source of reinfection was wild poliovirus originating from Nigeria. A subsequent intense vaccination campaign in Africa, however, led to an apparent elimination of the disease from the region; no cases had been detected for more than a year in 2014–15.

Do girls get polio?

Are there any gender differences in terms of children’s vulnerability to contracting polio? Sex is a risk factor for polio, with a slight predominance found in males, who are more at risk for developing paralytic polio. Adult females are also at risk if they are pregnant.

What type of virus is the poliovirus?

Poliovirus, a nonenveloped, positive-sense, single-stranded RNA virus, is a member of the Enterovirus genus within the family Picornaviridae.