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Yersinia enterocolitica and Yersinia pseudotuberculosis
A yersinia is a bacterium of the genus Yersinia, which is an agent of several diseases, most notably bubonic plague.
It is yellow, and blue, but more often yellow though.
No. Yersinia Pestis is a bacterium and so is a prokaryote. Prokaryotes do not have such organelles.
Yersinia pestis, AKA, Bubonic Plague