Vaccine

=//Polio Vaccine//=

Poliomyelitis (polio, for short) is a serious illness that can cause paralysis, when you can’t move your arms and legs, or even death. Polio is caused by a virus. The virus can be spread by drinking water with the polio virus in it. It can also be passed by close contact, such as kissing, with an infected person. Before the first polio vaccine was developed in the 1950s, thousands of children got polio every year. Fortunately, the use of the polio vaccine has made the disease very rare in most parts of the world. The way to prevent polio is getting the polio vaccine.   The first was developed by Jonas Salk and first tested in 1952. Announced to the world by Salk on April 12, 1955, it consists of an injected dose of inactivated (dead) poliovirus. Human trials of Sabin's vaccine began in 1957 and it was licensed in 1962. Because there is no long term carrier state for poliovirus in immunocompetent individuals, polioviruses have no non-primate reservoir in nature, and survival of the virus in the environment for an extended period of time appears to be remote. Therefore, interruption of person to person transmission of the virus by vaccination is the critical step in global polio eradication. The two vaccines have eliminated polio from most countries in the world, and reduced the worldwide incidence from an estimated 350,000 cases in 1988 to 1,652 cases in 2007.    bibliograpghy   //Brown University//. Web. 03 June 2011. .This website was used to get general information. It talked about the history of polio. //University of Mary Washington//. Web. 03 June 2011. .This website was used for pictures. In this picture, a man is using testubes for the polio vaccine. //Vaccine Information//. Web. 03 June 2011. .This website was used to get the truths and myths about polio. It also gave information about prevening polio.

