| 11. | Blood tests specific for Y . pestis showed that five participants in the study were infected.
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| 12. | Both are caused by the bacterium Yersinia pestis and are easily treated with antibiotics like tetracycline.
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| 13. | Caused by a bacterium, Yersinia pestis
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| 14. | An even deadlier form, pneumonic plague, develops when a person inhales Y . pestis.
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| 15. | The virus is called Yersinia pestis.
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| 16. | But scientists warn that plague probably is triggered by a particularly crafty bacterium, Yersinia pestis.
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| 17. | Additionally, Pulicidae transmit " Yersinia pestis ", the bacteria responsible for plague.
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| 18. | As civilization concentrated in crowded, dirty cities, Y . pestis became hardier and more infectious.
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| 19. | Bubonic plague is an infectious disease of animals and humans caused by a bacterium named Yersinia pestis.
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| 20. | A variety of alternatives to the " Y . pestis " have been put forward.
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