25/04/2026
Finding a bacterium does not mean you have found the cause. In microbiology, this is where mistakes begin. A sample grows. An organism is identified. The result looks definitive. But it isn’t.
The question is not just:
“What is present?” It is: “Does it matter?” Some bacteria are colonisers. Some are contaminants introduced during sampling. Some are part of a normal microbial community that were never causing disease in the first place.
Treating all of them as pathogens leads to the same outcome:
• Unnecessary antibiotics
• Misguided clinical decisions
• Signal lost in noise
This is where microbiology moves beyond testing. And becomes interpretation. Because results do not make decisions. People do. And good decisions depend on understanding context, not just detection.
