LEVEL 07 · LESSON 02
Suspected bacterial contamination
See it
Bacterial contamination can present in many ways, including cloudiness, colonies, films, or subtle reduced culture performance. Some bacteria can be internal or latent, so visual appearance alone is not enough for species-level identification.
Understand it
Separate ‘suspected bacterial contamination’ from confirmed identification.
Trace shared source material, media, tools, and handling events.
Follow the lab's containment/disposal procedure for suspect cultures.
Important boundary
Do not keep manipulating a suspect culture simply to see what happens if that risks spreading contamination.
Try it
Explain the concept in your own words, then identify what plant, explant, stage, units, source, or observation context would need to be preserved before applying it.
Lesson quiz
Apply it
Connect this lesson to an actual MyTCLab record: what fields would you need in order to know later exactly what happened and why?