CHAPTER 4
Saprophytes
free-living microbes that live on dead or decaying organic matter
can be seen in soil and water
Parasites
established themselves & can multiple
Pathogens
pathos - “disease”
gen - “produce”
capable to produce disease
Pthogenicity
ability to cause disease
Primary pathogen
organisms that are capable of producing disease
Opportunist pathogen
- rarely causes disease
- cause disease in immunocompromised
Commensals
Normal flora
complete harmony w/ host
does not cause disease/damage
Primary infection
initial infections
Reinfection
subsequent infection by the same parasite
Secondary infection
new parasite + pre-existing infectious disease
Local infection
local sepsis
localized site
Cross-infection
suffering from
an existing disease + new
infections from another host
Nosocomial infection
cross- infection at the hospital
Latrogenic infection
physicians induced infections
Inapparent infection
clinical effects are not apparent/visible
Subclinical infection
synonym to inapparent infection
Atypical infection
physical characteristics are not present
Latent infection
remain in the tissue/ hidden infection