Why Is Polio Still a Problem? — VOA Learning English
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Beginning
Polio was driven out of much of the world more than 30 years ago after a series of successful vaccination campaigns. But the viral disease is still spreading in a small number of nations.
The recent discovery of the first polio case in Gaza in 25 years led world health officials to set new goals to get rid of the disease in all areas.
What is polio?
Polio is an infection caused by a virus that mostly affects children under the age of five. Most infected people do not have any symptoms. But some can experience a high body temperature, headaches, vomiting and stiffness of the backbone, or spine.
The World Health Organization (WHO) says polio can affect the nervous system and cause paralysis…
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