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the entry and multiplication of an organism(infectious agent) in a host; are usually infectious or communicapable
if a microoganism is present or invades a host, grows and/or multiplies but does not cause infection
may not pose a risk for transmission (passing from one person to another) ex: viral meningitis & pneumonia
chain of infection
infection occurs in a cycle and depends on the presence of ALL of the following: 1)An infectious agent or pathogen 2)a reservoir or source for pathogen growth 3)a portal of exit from the reservoir 4)a mode of transmission 5)a portal of entry to a host 6)a susceptible host...... infection can develop if this chain is not interrupted
permanent residents of the skin, where they survive and multiply without causing illness, major part of the bodys protection
covers the entire exterior of the body; protects agianst pathogens, imortant to retain and maintain
attach to the skin when a person has contact with another person during normal activites; attach loosely to skin in dirt and grease or underneath fingernails
the potential for microorganisms to cause disease depends on:
1)sufficient number of organisms (dose) 2)Virulence 3)ability to enter and survive in the 4)susceptibility of the host (host resistance)
persons who show no symptoms of illness but who have pathogens on or in their bodies that can be transferred to others
required by aerobic bacteria for survival and for multiplication sufficient to cause disease; cause more infections in humans than anaerobic
strive where little or no oxygen is available; infections deep in pleural cavity, in ajoint, or in deep sinus
are required by most organisms for survival; usually the most frequent place for microorganisms
is important because it influences where microorgansims live; usually is around 20 to 43 C (68F to 109F) where they grow best
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