Incubation Period: this is the time between infection and occurrence of the first symptoms or signs of disease.
Prodromal Period: this is a short time of generalized, mild symptoms (such as malaise and muscle aches) that proceeds illness. Not all infections disease have a prodromal stage.
Illness: This is the most severe stage of an infectious disease.Signs and symptoms are most evident during this time.
Decline: This is the time that the body gradually returns to normal as the patient's immune response and/or medical treatment vanquish the pathogens. Fever an other signs and symptoms subside.
Convalescence: This is the time when the patient recovers from the illness; tissues are repaired and returned to normal.
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