Definition: A pathogen is a biological agent – such as a bacterium, virus, fungus, parasite or prion – that can cause disease in a host organism. In simple terms: a pathogen is an infectious microbe ...
According to estimates, about a third of the world's population is infected with the single-celled parasite Toxoplasma gondii, the pathogen of toxoplasmosis. Although harmless for most people, the ...
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