PetriKey

Concept

Colonization vs contamination vs infection

Interpretation vocabulary for coursework

kol-oh-nih-ZAY-shun kon-tam-ih-NAY-shun in-FEK-shun

conceptcolonizationcontaminationinfectionmicrobiota

High-yield clue

Finding a microbe is not the same as proving it is causing disease.

Overview

A core reasoning concept for separating resident organisms, accidental sample contamination, and disease-causing infection in class discussions.

Classification

  • Host-microbe concept
  • Specimen interpretation vocabulary

Lab & identification clues

  • Normal flora vocabulary
  • Sterile-site concept
  • Clinical correlation vocabulary without diagnostic guidance

Associations

  • Staphylococcus epidermidis
  • Candida auris colonization
  • Normal microbiota

Commonly confused with

  • Normal flora / microbiota
  • Pathogen

Your notes

Original microbiology concept summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC/WHO topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment selection, infection-control instructions, or specimen-handling guidance.

OpenStax: Microbiology 2e concept foundationssourceNCBI Bookshelf: Medical Microbiology general conceptssourceCDC: CDC public-health concept pagessource