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==Key Stage 3==
===Meaning===
A '''pathogen''' is a [[micro-organism]] which causes an [[infection]].
===About Pathogens===
: [[Pathogen]]s are sometimes referred to as germs.
: [[Pathogen]]s are a cause of [[disease]] in [[organism]]s.
: [[Pathogen]]s can be passed from one [[organism]] to another.
==Key Stage 4==
===Meaning===