| 11. | The vaccine is derived from a live virus whose disease-causing properties have been disabled.
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| 12. | This makes it difficult to tell a vaccinated animal from one harboring live virus.
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| 13. | The live virus vaccine promised lifetime immunity, while the original Salk vaccine did not.
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| 14. | Several vaccines are available that use modified live viruses.
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| 15. | Gonzalez, who cleaned up the spill, breathed in the live virus, Yale officials had said.
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| 16. | Many human vaccines are derived from weakened live viruses.
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| 17. | In contrast, inactivated virus vaccines contain no living virus, and cannot cause a live infection.
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| 18. | Because HIV is so unpredictable, vaccine researchers don't use the live virus in human experiments.
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| 19. | Many vaccines are made by weakening a live virus.
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| 20. | Both are taken orally and contain attenuated live virus.
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