HOST-PARASITE INTERACTIONS

MICROBIAL FLORA OF THE NORMAL HUMAN BODY (normal flora)

SKIN
RESPIRATORY TRACT
Nose and Nasopharynx
EYE (Conjunctivae) and OUTER EAR
INTESTINAL TRACT
Stomach and Small Intestine; Large Intestine;
Intestinal Tract of Newborn
GENITOURINARY TRACT
External Genitalia & Anterior Urethra
BLOOD and TISSUES
NORMALLY STERILE SITES IN THE HUMAN BODY

Colonization of one of these sites generally involves a defect or breach in the natural defenses that creates a portal of entry

Brain; Central nervous system
Blood; Tissues; Organ systems
Sinuses; Inner and Middle Ear
Lower Respiratory Tract: Larynx; Trachea; Bronchioles (bronchi); Lungs; Alveoli
Kidneys; Ureters; Urinary Bladder; Posterior Urethra
Uterus; Endometrium (Inner mucous membrane of uterus ); Fallopian Tubes; Cervix and Endocervix
EPIDEMIOLOGY

EPIDEMIC: disease occuring suddenly in numbers clearly
in access of normal expectancy

ENDEMIC: disease present or usually prevalent in a population or geographic area at all times

PANDEMIC: a widespread epidemic distributed or occuring widely throughout a region, country, continent, or globally
PATHOGENICITY vs. VIRULENCE

PATHOGENICITY: ability to produce pathologic changes or disease.

VIRULENCE: severity of the disease produced.