Efficient transmission of " Yersinia pestis " is generally thought to occur only through the bites of fleas whose mid guts become obstructed by replicating " Y . pestis " several days after feeding on an infected host.
2.
The mid gut bears many digestive ceca, compartments with no other exit, that extract nutrients from the food; most are in the abdomen, which is dominated by the digestive system, but a few are found in the cephalothorax.
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