Wednesday, December 14, 2011

discover polio

Polio is a contagious disease caused by an intestinal virus that may attack nerve cells of the brain and spinal cord. Symptoms include fever, headache, sore throat, and vomiting. Some victims develop neurological complications, including stiffness of the neck and back, weak muscles, pain in the joints, and paralysis of one or more limbs or respiratory muscles. In severe cases it may be fatal, due to respiratory paralysis.



Polio can be spread through contact with contaminated feces (for example, by changing an infected baby’s diapers) or through airborne droplets, in food, or in water. The virus enters the body by nose or mouth, then travels to the intestines where it incubates. Next, it enters the bloodstream where Aanti-polio antibodies are produced. In most cases, this stops the progression of the virus and 30 the individual gains permanent immunity against the disease. Figure 1. Polio cases skyrocketed after diphtheria and per- tussis vaccines were introduced.Many people mistakenly believe that anyone who contracts polio will become paralyzed or die. However, in most infections 20 caused by polio there are few distinctive symptoms. 



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