| 1. | Researchers believe that's due, in part, to a phenomenon called herd immunity.
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| 2. | Herd immunity from female vaccination does not, however, extend to homosexual males.
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| 3. | Increasing herd immunity also helps people who have a compromised immune system.
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| 4. | Increasing herd immunity and requiring vaccination in children helps decrease this risk.
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| 5. | The higher the herd immunity, the more mosquitoes necessary to start an epidemic.
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| 6. | Herd immunity can only be achieved when vaccination levels are high.
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| 7. | What keeps outbreaks in check, is something called herd immunity.
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| 8. | This is especially true if a herd immunity already exists to the disease in question.
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| 9. | High levels of immunity in one age group can create herd immunity for other age groups.
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| 10. | Herd immunity is an important supplement to vaccination.
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