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<p>is on average 7-14 days (ranging 6-20 days), and rarely as long as 42 days.</p>

<p><big>Cause</big></p>
<p>The bacterium <a href="page.php?w=Bordetella_pertussis">Bordetella pertussis</a> causes whooping cough. It is an <a href="page.php?w=airborne_disease">airborne disease</a> (through droplets) that spreads easily through the coughs and sneezes of an infected person.</p>

<p><big>Host species</big></p>
<p>Humans are the only host species of B. pertussis. Outbreaks of whooping cough have been observed among chimpanzees in a zoo and wild gorillas; in both cases,</p><p>
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