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Convalescent period

The period between the end of a disease and the complete restoration of health in a patient

Localized infection

microbes enter the body and remains confined to a specific tissue

Systemic infection

infection spreads to several sites and tissue fluids usually in the bloodstream

Focal infection

when infectious agent breaks loose from a local infection and is carried to other tissues

Mixed infection

several agents establish themselves simultaneously at the infection site


infection involving multiple bacteria (a variety of anaerobes)

Primary infection

initial infection

Secondary infection

Opportunistic infection after a primary (predisposing) infection

Acute infections

diseases that occur quickly and have severe symptoms, but last only for a short time.

Chronic infections

Infections that progress and persist over a long period of time


Any objective evidence of disease as noted by an observer


Subjective evidence of disease as sensed by the patient


a disease that can be identified or defined by a certain complex of signs and symptoms


nonspecific response to tissue injury that protects the host from further damage. stimulates immune re-activity and blocks the spread of an infectious agent


the accumulation of fluid in an afflicted tissue


collections of inflammatory cells and microbes in the tissues


an inflamed fibrous lesion enclosing a core of pus

Mortality rate

measures the total number of deaths in a population due to a certain disease

Morbidity rate

the number of persons afflicted with infectious diseases


an infectious disease that exhibits a relatively steady frequency over a long time period


occasional cases are reported at irregular intervals in random locales


A widespread occurrence of an infectious disease in a community at a particular time


spread of epidemic across continents

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