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Fleas transmit Y. pestis ID. (A) Skin section of a fleabite site 3 days after infection with wild-type Y. pestis. A large bacterial mass (light purple area surrounded by red arrowheads) extends from the middle of the dermis to the hypodermal border. E, epidermis; D, dermis; H, hypodermis. (B) Apposition of the head of an X. cheopis flea with its mouthparts centered over the infecting mass of bacteria. (Magnification: ×100.)
