שעלת (בלועזית: פרטוסיס, Pertussis או Whooping cough) היא מחלה זיהומית הנגרמת על ידי החיידק Bordetella Pertussis, השייך למערכת החיידקים הארגמניים. על-פי ארגון הבריאות העולמי נמנית המחלה כאחת מעשר המחלות הקטלניות בעולם.
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