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Index >> Infection and Disease >> Phases In Progress of Diseases

Phases In Progress of Diseases

Phases In Progress Of Diseases

Disease is a dynamic series of events expressing the competition between host and parasite. Most diseases follow a definite recognisable pattern of development. The various phases of disease development that appears in sequence are as follows:

1. Incubation period.
This is initial phase representing the time period between the entrance of the parasite and the appearance of symptoms. This may be short of 1-3 days as in cholera, a moderate of two weeks as in chickenpox, Or as long as 3-6 years as in leprosy.

2. Period of prodromal symptoms. This phase is characterised by I general symptoms such as nausea, fever, headache etc. which indicate that the competition for supermacy has begun. 

3. Period of acme
This is the acute phase when specific symptoms appear. There may be body rash, brain lesions, jaundice, skin ulcers, swollen glands etc. There may be high fever and chills

4. Period of decline or defervescence
This is the stage during which the symptoms subside. It is finally followed by

5. Period of convalescence
During this time the body systems return to normal. Transmission of Disease The causal agents of disease may be transmitted by a variety of methods. Broadly, an such methods could be divided as
(i) direct methods and
(ii) indirect methods virulent commensal of humans, but certain toxin producing strains have been isolated that cause

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