4. DISEASE
• A departure from a positive state
or health or well-being
• An impairment of the normal
state of organisms that affect the
performance of vital functions
6. • OBLIGATE HOST
• Man may become an obligate host where
the microbiological agent has been
established in man and only in man for
its survival
• PRINCIPAL HOST
• Man is chiefly responsible for the
propagation of the parasite.
• OCCASIONAL HOST
• Man is the secondary host, one organism
is the principal reservoir, man is
unimportant reservoir
7. DISEASE AGENT
• There are substances or elements, the
presence or absence of which, may imitate
or perpetrate a disease process.
BIOLOGICAL (Ebola, Botulism, Legionnaire’s disease)
CHEMICAL (Radiation, Vibration, Extreme temperature)
PHYSICAL (Heat stroke, Heat exhaustion, Frostbite)
NUTRITIONAL (Hypertension, Cancer, and Diabetes)
PSYCHOLOGICAL (Bipolar, ADHD, Depression)
8. ENVIRONMENT
• There are ecological factors which
may be favorable or unfavorable in
the development of diseases.
• Favorable ecological factors
• Unfavorable ecological factors
9. ASSIGNMENT
• Research for the Six Essential
Factors in the Development of the
Infection Process.
Be prepared for a
reportorial system
Editor's Notes
virus, parasite, fungus, or bacterium
Chemical agents
noise, vibration, radiation, and extremes in temperature
diet, obesity and eating disorders, and chronic diseases such as cardiovascular disease, hypertension, cancer, and diabetes mellitus
