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CLASSIFYING INFECTIOUS DISEASES

CLASSIFYING INFECTIOUS DISEASES - CLASSIFYING INFECTIOUS...

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CLASSIFYING INFECTIOUS DISEASES   Diseases cause:    Symptoms---changes not apparent to an observer    Signs---changes that can be observed or measured A syndrome is a group of signs and symptoms that always accompanies a particular disease.    Infectious diseases may be classified in several ways:      1. How the disease is spread       a. Communicable disease—a disease that spreads from one host to another, either directly or  indirectly         b. Contagious disease--- EASILY  spread from one person to another         c. Noncommunicable disease---not spread from one host to another         2. Occurrence of the disease            a. Incidence of a disease—the fraction of a population that contracts the disease in a  particular time period         b. Prevalence of a disease—the fraction of a population having the disease at a specified time  
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     c. Frequency of occurrence 
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