Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam 2026 - Free Sterile Processing Technician Practice Questions and Study Guide

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Which type of bacteria is E. Coli classified as?

Gram-Positive Coccus

Gram-Negative Bacilli

E. coli, or Escherichia coli, is classified as a Gram-Negative Bacilli. This classification is based on its distinct characteristics and the method used for staining bacteria. Gram-negative bacteria, like E. coli, do not retain the crystal violet stain used in the Gram staining procedure and appear pink after being stained with safranin.

In terms of morphology, E. coli has a rod-like shape, which is why it is considered a bacilli. Gram-negative bacteria are known for having a thinner peptidoglycan layer and an outer membrane, which can affect their virulence and how they respond to antibiotics. The understanding of E. coli being a Gram-Negative Bacilli plays a crucial role in infection control and sterile processing, as it helps in determining the appropriate cleaning and disinfection protocols needed to manage these pathogens effectively.

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Mycobacteria

Gram-Positive Rods

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