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Polio
Beginning of essay
myelitis, infectious virus disease of the central nervous system, sometimes resulting in paralysis. The greatest incidence of the disease, also known as infantile paralysis, is in children between the ages of five and ten years. The disease was described in 1840 by the German orthopedist Jacob von ....
Middle of essay
....ontrol was made possible when, in 1949, the American bacteriologist John Franklin Enders and his coworkers discovered a method of growing the viruses on tissue in the laboratory. Applying this technique, the American physician and epidemiologist Jonas Salk developed a vaccine prepared from inactivated poliomyelitis viruses of the three known types. After field trials in 1954 the vaccine was pronounced safe and effective, and mass inoculation began. The American virologist Albert Sabin subsequent.... |
| Number of words: 416 |
Approximate pages: 2 |
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