Introduction to epidemiology

what is epidemiology

human and animal ecology that relates to states of health

what are the basic assumptions of epidemiology

• disease does not occur at random 

• disease has causal and preventative factors and can be identified through observation

• disease occurrence is related to the environment of the species of interest 

what an etiologic agent characteristics

• infectivity

• pathogenicity

• virulence

an etiologic agent that kills a lot of people has high what

virulence

an etiologic agent that causes a lot of disease has a high what

pathogenicity

an etiologic agent that reproduces a lot has a high what

infectivity

what are the types of hosts

• natural host

• dead end host

• amplifier host

what are the two types of disease transmission

• horizontal

• vertical

what are the types of horizontal transmission

• direct

• indirect

what are the types of vectors

• mechanical

• biological

what is the difference between aerosol vs airborne

aerosol is a shorter distance

what does YOPI stand for

• young

• old

• pregnant

• immune compromised

the incidence of mad cow disease is more common in beef or dairy cattle

dairy cattle

what is the epidemiologic triad

• agent

• host

• environment