infectious disease
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An infectious disease is an illness caused when harmful biological agents—like bacteria, viruses, or parasites—get into your body and multiply. It matters because these diseases can spread from person to person and affect public health, making them a significant concern for individuals and communities.
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Article
An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection.
Infections can be caused by a wide range of pathogens, most prominently bacteria and viruses. Hosts can fight infections using their immune systems. Mammalian hosts react to infections with an innate response, often involving inflammation, followed by an adaptive response.