The Black Death
The Black Death
The Black Death
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Vectors‣When rats die of plague, fleas jump to new host and this can behumans‣Human not vector of choice because humans are poortransmitters (and then only of pneumonic form)‣<strong>Black</strong> rat – Rattus rattus‣Brown sewer rat – Rattus norvegicus‣Primary flea vector is Xenopsylla cheopsis (oriental rat flea)‣When flea has blood meal containing Y.pestis this causesblockage of the digestive tract; this allows the bacilli to form biofilmson the gut surface‣Flea tries to clear gut by repeated biting and regurgitation of thebacteria
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