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The history of polio (poliomyelitis) infections began during prehistory. Although major polio epidemics were unknown before the 20th century, [1] the disease has caused paralysis and death for much of human history. Over millennia, polio survived quietly as an endemic pathogen until the 1900s when major epidemics began to occur in Europe. [1]
Poliomyelitis (/ ˌ p oʊ l i oʊ ˌ m aɪ ə ˈ l aɪ t ɪ s / POH-lee-oh-MY-ə-LY-tiss), commonly shortened to polio, is an infectious disease caused by the poliovirus. [1] Approximately 75% of cases are asymptomatic; [5] mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe symptoms develop such as headache, neck stiffness, and paresthesia.
A few weeks later, Salk injected children at the Polk State School for the Retarded and Feeble-minded. He vaccinated his own children in 1953. [29] [30] In 1954 he tested the vaccine on about one million children, known as the polio pioneers. The vaccine was announced as safe on April 12, 1955.
Polio is an infection caused by a virus that mostly affects children under 5. Most people infected with polio don’t have any symptoms, but it can cause fever, headaches, vomiting and stiffness ...
In its early stages, poliomyelitis — known as polio — causes fatigue, headaches, stiffness and limb pain after exposure to the poliovirus, according to the World Health Organization, or WHO ...
Additionally, more of the cases among children stemmed from native-born or established immigrant groups. It was determined that the overlooked immigrants had lower mortality rates from Polio as opposed to children from the standard American family. A study found that over 60% of the cases in children were from native-born families. [7]
In the early 1950s, before Salk’s vaccine, polio outbreaks caused more than 15,000 cases of paralysis each year, the CDC said. After the vaccines — there are two: trivalent inactivated ...
In the 1940s there were 40,000 new cases every year, and summer programs for children were restricted, especially swimming pools. From 1938 through the approval of the Salk vaccine in 1955, the foundation spent $233 million on polio patient care, which led to more than 80 percent of U.S. polio patients' receiving significant foundation aid. [50]