Polio, also known as poliomyelitis, is a highly infectious viral disease that can cause paralysis. Most of the world’s countries are free from polio, although small numbers of cases are still reported in Afghanistan and Pakistan. In particular, it is found in areas where water treatment and sanitation facilities are not properly maintained or are nonexistent.
Although children under 5 years of age make up more than half of all cases, polio can affect people of any age.
The World Health Organization is at the heart of a plan to help make the world free from the disease. Since there is no animal infection or reservoir of the virus, the complete removal of the disease from the human population through vaccination is possible. The number of polio-endemic countries in 1988 was over 125; in early 2015, this number had been reduced to just 2. Since 1996, there have been no reported cases of polio within Canada.
Polio is caused by infection with the poliovirus. This virus is highly contagious, and is passed on through food and water contaminated with the stool (feces) of infected people. It can take 4 to 21 days before symptoms appear, and an infected person can pass the virus on to other people even before symptoms appear.
Infection with polio happens when the virus enters the body through the mouth, multiplies in the throat and intestine, and spreads through the blood to the central nervous system. There, the virus attacks nerve cells, which can lead to paralysis.
Because there is no cure for polio, supportive therapy is the main treatment. Improving a person’s chance of recovery is the main goal of treatment. This type of treatment helps minimize discomfort and prevent complications while the person recovers. Supportive treatment may include medications for polio symptoms, ventilators to help the person breathe, exercise, and a balanced diet.
Polio is not a treatable disease, yet it is almost completely preventable. Vaccination with the polio vaccine provides the most effective form of prevention. Childhood immunization programs protect Canadians from infection by the poliovirus.
Health Canada recommends you check with your family doctor before traveling overseas as you may be going to a high-risk area. Getting the vaccination before you leave may protect you while traveling, especially if you have never been vaccinated against polio.
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