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An infection is caused by the invasion of by pathogenic organisms (bacteria, viruses or worms) into a host. These pathogenic organisms live and multiply in its host and cause diseases by this.

18 votes

Has there even been a clinical study where healthy volunteers consented to be infected with ...

Yes, Dr Barry Marshall self administered Helicobacter pylori to investigate whether it causes stomach ulcers. He won a Nobel Prize for it. https://en.wikipedia.org/wiki/Barry_Marshall
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