What is used to study a disease among certain groups?
Epidemiology
What is it used for?
to study disease in a population
What is a way to show that a disease can be spread to others?
satisfy Koch's postulates
How many microorganisms cause disease?
relatively few
What are the infectious ones grouped as?
as primary pathogens or as opportunistic pathogens
Why can't Koch's proposal be morally applied?
it would require experimental infection of a healthy individual
What is beneficial to explore during a disease outbreak?
to determine if a disease outbreak is sporadic
Who else can a host's immune system cause harm to>
to the host itself
What causes tuberculosis?
Mycobacteria species
What is unable to be cultured in vitro?
syphilis