- A 'micro-organism' is a single-celled organism that is too small to be seen without a microscope.
- micro-organisms include: bacteria and viruses.
what is meant by disease?
- disease suggests a malfunction of body or mind which has an adverse effect on good health.
For a micro-organism to be considered a pathogen it MUST:
- gain entry to the host,
- colonise the tissues of the host,
- resist the defences of the host
- cause damage to the hosts tissues
pathogens include: bacteria, fungi and viruses.
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