Enterobacterias. Gram-negative bacterias escherichia coli, salmonella, klebsiella, legionella, mycobacterium tuberculosis, yersinia pestis, and shigella, proteus, enterobacter, serratia, and citrobacter.

An artist's 3D illustration of a proteobacteria such as Legionella. Illustration: Getty Images.

An artist’s 3D illustration of a proteobacteria such as Legionella. Illustration: Getty Images.

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