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Term | Definition |
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Pathogen | Microorganisms capable of producing disease |
Examples of reservoirs | Humans, animals, insects, food, and water |
Virulence | Ability of an organism to produce disease rapidly |
Infection | Invasion of the body by pathogenic microorganisms that reproduce and multiply |
Examples of ports of exit and entry | Skin, mucous membranes, respiratory tract, urinary tract, gastrointestinal tract, reproductive tract, blood |
Symptomatic | Pathogens multiply and cause clinical signs and symptoms |
Examples of modes of transmission | Direct or indirect contact, contaminated items, and insects |
Microorganisms | Microscopic entities, such as bacteria, viruses, and fungi, capable of carrying on living processes |
Asymptomatic | Pathogens multiply and clinical signs and symptoms are not present |
Elements of the chain of infection | Infectious agent, reservoir, port of exit, mode of transmission, port of entry, and host |
Infectious agents | Microorganisms, including bacteria, viruses, fungi, and protozoa |
Communicable disease | Any disease transmitted from one person/animal to another by direct or indirect contact or by vectors |
Colonization | Presence and multiplication of microorganisms without tissue invasion or damage |
Susceptibility | Individual's degree of resistance to pathogens |
Immunity | Inability to acquire disease either through natural or artificial means |
Localized infection | Wound infection with symptoms such as pain, tenderness, and redness |
Systemic infection | Infection that affects the entire body instead of a single organ or part |
Defenses against infection | Normal floras, body system defenses, and inflammation |
Inflammatory response events | Vascular and cellular response, inflammatory exudates, and tissue repair |
Normal floras | Bacteria in the body that contribute to maintaining health if residing in the usual area of the body |
Suprainfection | Secondary infection usually caused by an opportunistic pathogen |
Inflammation | Protective vascular reaction that delivers fluid, blood products, and nutrients to an area of injury |
Antigen | Foreign material that enters the body |
Health care–acquired infection (HAI) |