An illness that occurs through the transmission of an infectious agent is known as what?

The term that describes an illness transmitted through the spread of an infectious agent is "communicable disease." This term specifically refers to diseases that can be passed from one person to another, either directly or through indirect means, such as contact with contaminated objects, water, or airborne particles.

A communicable disease is typically caused by a variety of pathogens, including bacteria, viruses, fungi, and parasites. It emphasizes the aspect of transmission between individuals or within populations. Understanding this concept is vital for public health measures aimed at controlling outbreaks and preventing the spread of illness.

While "infectious disease" also refers to an illness caused by an infectious agent, it does not exclusively imply transmission between individuals; some infectious diseases may be contracted through non-communicable means as well. "Contagious disease" often conveys a similar meaning to communicable diseases but may imply a more rapid or direct form of transmission. "Chronic disease," on the other hand, refers to long-term health conditions that may or may not be linked to infectious agents and do not focus on the transmission aspect.