What caused polio?
Polio is caused by the poliovirus.
The virus enters the body through the mouth.
It is spread through contact with the feces (stool) of an infected person or through exposure to phlegm or mucus when an infected person coughs or sneezes..
What is the key symptom of polio?
About 1 out of 4 people with poliovirus infection will have flu-like symptoms that may include: Sore throat. Fever. Tiredness.
Did polio virus come from animals?
Polio was known to be an infectious disease since Karl Landsteiner and Erwin Popper’s famous experiments in 1908 showed that polio could be transmitted between animals. It is transmitted from human to human, typically through drinking water contaminated with faeces containing the virus.
Who created the polio virus?
In the early 1950s, 25,000 to 50,000 new cases of polio occurred each year. Jonas Salk (1914–1995) became a national hero when he allayed the fear of the dreaded disease with his polio vaccine, approved in 1955.
Where is the polio virus found?
Our Progress Against Polio Only three polio-endemic countries (countries that have never interrupted the transmission of wild poliovirus) remain—Afghanistan, Nigeria, and Pakistan. Without our polio eradication efforts, more than 17 million people who are currently healthy would have been paralyzed by the virus.
Does polio still exist?
Polio does still exist, although polio cases have decreased by over 99% since 1988, from an estimated more than 350 000 cases to 22 reported cases in 2017.
How was the polio virus transmitted?
Polio is spread when the stool of an infected person is introduced into the mouth of another person through contaminated water or food (fecal-oral transmission). Oral-oral transmission by way of an infected person’s saliva may account for some cases.
When did they stop giving polio vaccine?
OPV was recommended for use in the United States for almost 40 years, from 1963 until 2000. The results have been miraculous: Polio was eliminated from the United States in 1979 and from the Western Hemisphere in 1991. Since 2000, only IPV is recommended to prevent polio in the United States.
Why does Pakistan still have polio?
By 1991, only 83 percent of Pakistani children had been vaccinated. Research by the Center for Disease Control (CDC) in April 1998 cited a failure to vaccinate, vaccine failure, and inadequate immunization strategies as causes for the continued incidences of polio in this time.