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Infectious Agent
/ɪnˈfɛkʃəs ˈeɪdʒənt/noun
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An infectious agent is a microscopic organism or particle, such as a virus, bacterium, fungus, or prion, that invades a host organism and causes disease by replicating or disrupting normal cellular functions. In modern contexts, these agents are central to epidemiology and public health strategies, highlighting their role in everything from everyday illnesses to global pandemics.
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The smallest known infectious agent, a virus called Porcine circovirus, measures just 17 nanometers in diameter—smaller than the wavelength of visible light—yet it can devastate entire pig populations and has even been linked to human diseases, challenging our understanding of life at the molecular level.
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