When an infectious agent spreads from a local site and is carried to other tissues, the infection is called a focal infection.
Infectious agent is the organism that causes any form of disease. The organism can be present inside the body of the host or outside. The general infectious agents are: bacteria, viruses, fungi, etc.
Focal infection is the infection caused when the root cause of the disease, any microbe or the toxins causing the disease, move from their are of localization to different places in the body. The common focal infections are: tonsillitis, upper respiratory tract infections, sinusitis, dental caries, etc.
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