PMLS 2

CHAIN OF INFECTION   

6-PART MODEL  Infectious Agent Reservoir Portal of exit Mode of transmission Portal of entry Susceptibility host 

3-PART MODEL   Source Transmission Host (susceptible)

6-PART MODEL   Infectious agent -  Pathogenic microbe responsible for causing an infection Examples:  viruses, bacteria, fungi, protozoa, and worms

      2.   Reservoir – Source of infectious agent                               – Place where microbe can survive & grow or multiply Examples:  humans, animals, food, water, soil, equipment

      3.   Portal of exit – A way an infectious agent is able to leave a reservoir host Examples:  Secretions & exudates, tissue specimens, blood, feces, urine

      4. Mode of transmission    Direct                       ~ Direct Contact - physical or sexual                       ~ Droplet transmission -   Indirect