| 31. | In the end, even Salk's doubters concede that they don't know exactly how the Salk vaccine will react in the long-term testing.
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| 32. | It was the death of Hall a young, fit, international footballer from Salk vaccine was available, takeup had been slow.
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| 33. | But the United States changed the protocol for polio vaccinations in 1997 to include the Salk vaccine, in order to prevent mutations.
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| 34. | Popescu was a twin; his brother died of polio because Romania was too poor and too backward to import the Salk vaccine.
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| 35. | Sabin's vaccine, made from a live version of the virus and delivered in drops rather than injections, supplanted the Salk vaccine in 1962.
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| 36. | Equally important, Prevots said, is that the oral vaccine creates strong immunity in the intestine, whereas the Salk vaccine has a weaker effect.
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| 37. | However, a year and a half after the Salk vaccine was introduced, a Sabin vaccine had still not yet been tested on humans.
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| 38. | Once types 1 and 3 cease to be endemic, the OPV will be phased out, and the Salk vaccine will be used exclusively.
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| 39. | In the 1950s, when the Salk vaccine erased the threat of polio, the pools were closed and became cracked and filled with algae.
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| 40. | But officials did not recall contaminated Salk vaccine _ more than a year's supply _ still in the hands of the nation's doctors.
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