noun
a disease caused by the entrance into the body of organisms, such as bacteria, viruses, or fungi, which grow and multiply there
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The government is implementing measures to prevent the spread of infectious diseases.
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Make sure to wash your hands regularly to avoid catching any infectious diseases.
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Dude, don't be dumb and go around getting yourself infected with some nasty disease.
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Gossip can be like an infectious disease, spreading quickly and causing harm.