On October 20, 1998, after 18 years of using the Sabin vaccine, however, the federal government recommended that children use the Salk vaccine exclusively.
42.
After all, the " mad doctor " pictures of the'40s anticipated such real-world developments as cryogenic research, the artificial heart and the Salk vaccine.
43.
Her tenure's most critical test came with the announcement of the Salk vaccine to prevent polio, which had stricken thousands in a 1952 epidemic.
44.
In fact, the Salk vaccine was continuing to cause polio induced paralysis in several countries where there were no epidemics from the wild virus.
45.
He pointed out that the Salk vaccine was not 100 percent effective, but it still saved many people before a better vaccine came along.
46.
Frederick Mosteller, a renowned statistician at Harvard, compared the study to the Salk vaccine trials as a seminal moment in the history of research.
47.
Seventy-three years later, the national spotlight hit Protection when it became the first town in America to be protected against polio with the Salk vaccine.
48.
They pointed to the fact that the Salk vaccine was supplanted a few years later by the Sabin oral vaccine, which used a live but weakened virus.
49.
The Food and Drug Administration is considering whether to allow so-called Phase III clinical trials of the Salk vaccine to go ahead in about 5, 000 patients.
50.
For example, thousands cases of viral and aseptic meningitis are reported annually in the U . S . which were diagnosed as polio before the Salk vaccine.
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