| 1. | But more than 95 percent of the population has a natural immunity.
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| 2. | Many vaccines have been designed by studying people with natural immunities.
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| 3. | Natural immunity from maternal antibodies lasts in the kitten from three to nine weeks.
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| 4. | More than 95 percent of the population has a natural immunity to the disease.
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| 5. | Years ago, when pertussis was pervasive, children were regularly exposed and developed natural immunity.
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| 6. | Because of genetic mutations, they are bald and have little natural immunity to disease.
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| 7. | In immunology, he is given an epithet the " father of natural immunity ".
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| 8. | Ten-year-olds, in my experience, have a natural immunity to the soporific effects of beauty.
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| 9. | Most people born before that time have some natural immunity, Dr . Arden said.
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| 10. | If a victim survives, he or she develops a natural immunity to the disease.
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