| 11. | People can acquire natural immunity to malaria, so making an antimalaria vaccine should be possible.
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| 12. | Infection induces incomplete natural immunity that wanes over time.
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| 13. | :: : : It's not just lack of vaccines, it is lack of natural immunity.
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| 14. | Doctors once assumed that patients'natural immunity would keep them from getting the virus more than once.
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| 15. | In 1738 and 1739 smallpox epidemics broke out among the Cherokee, who had no natural immunity.
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| 16. | That is comparable to natural immunity to rotaviruses, and also to the efficacy of influenza vaccines.
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| 17. | Thousands more of the Indians succumbed to European diseases to which they had no natural immunity.
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| 18. | Most successful human vaccines have been developed on the basis of understanding natural immunity, he said.
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| 19. | Solid natural immunity develops in recovered birds.
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| 20. | California's native population precipitously declined, above all, from Eurasian diseases to which they had no natural immunity.
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