| 21. | For years, researchers had believed that all SV40-contaminated Salk vaccine made between 1955 and 1963 had been used or discarded.
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| 22. | An estimated 90 million Americans received Salk vaccine injections and as many as 30 million were exposed to the virus.
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| 23. | In short, the Internet has been a combination of the hydrogen bomb, the Salk vaccine for polio and Mother Teresa.
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| 24. | In this country, the Salk vaccine soon ended the yearly threat of epidemics and the toll of paralysis and death.
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| 25. | The introduction of the Salk vaccine in the 1950s and the Sabin vaccine in 1961 brought hope of controlling the virus.
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| 26. | In the end, even Salk's doubters concede that they don't know exactly how the Salk vaccine will function in long-term testing.
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| 27. | Of the changes, the return last month of the Salk vaccine for polio, given by injection, has created the most controversy.
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| 28. | Because of this, the computer modem is way bigger than the Salk vaccine or even Olestra as far as I'm concerned.
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| 29. | Hattox said he contracted polio at 16 months of age, before the Salk vaccine that has made the disease a rarity.
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| 30. | Until 1955, when the Salk vaccine was introduced, polio was considered one of the most frightening public health problems in the world.
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