Incidence: Number of new cases of sidease/total number of people in population
Prevalence: Total number of cases of disease/total number of people in population
Epidemic: INcrease in incidence of disease
Reservoir: Where microbe (that —> disease) exists in nature, usually.
ex) HIV reservoir= humans
C. perfringens = soil
V. fischeri = squid, seawater
over time, most microbes become less virulent in reservoir
Vector: Organism that transmits infectious disease from hots to host
ex) y. pestis' (plague) vector = flea
Virulent: Microbe that causes symptoms
Virulence: ability to cause symptoms
Virulence factor: Any chemical made by a pathogenic microbe that contributes to that microbe's ability to cause symptoms.