Infectious diseases are caused by microorganisms like viruses, bacteria, fungi, or parasites and can spread from person to person.
A pathogen is an organism that causes disease in its host, and the severity of the disease symptoms is referred to as virulence.
Infectious diseases are caused by microorganisms like viruses, bacteria, fungi, or parasites and can spread from person to person.
Thus, the disease that scientists call caused by a pathogen that is easily passed between people is infectious diseases.
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