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Pertusis

What causes pertussis?
Pertussis, or whooping cough, is a disease of the respiratory tract caused by bacteria that live in the mouth, nose, and throat. Many children who contract pertussis have coughing spells that last four to eight weeks. The disease is most dangerous in infants. In 2000, an estimated 39 million cases and 297 000 deaths occurred worldwide, due to pertussis.
How does pertussis spread?
How long does it take to show signs of pertussis after being exposed?
What are the symptoms of pertussis?
What are possible complications from pertussis?
How pertussis is diagnosed?
Is there a treatment for pertussis?
How long is a person with pertussis contagious?
Can you get pertussis more than once?