| 21. | Most doctors do not think of pertussis in adults.
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| 22. | Whooping cough is caused by the bacteria Bordetella pertussis.
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| 23. | A dramatic increase in the incidence of pertussis followed.
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| 24. | Pertussis ( whooping cough ) caused by Bordetella pertussis.
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| 25. | Pertussis ( whooping cough ) caused by Bordetella pertussis.
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| 26. | Pertussis is a very serious illness, and it is striking with increasing frequency.
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| 27. | Pertussis also occurs in older children and adults, but usually with milder symptoms.
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| 28. | The effectiveness of the old and new pertussis vaccines is comparable, researchers said.
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| 29. | In most countries, infants get their first pertussis shot at one month old.
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| 30. | The incidence of pertussis plummeted in industrialized nations after vaccination began in the 1940s.
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