A sequence of circumstances where all events must occur to develop an infection

Infectious Agent (pathogen)

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Bacteria

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Single celled prokaryotic microorganisms (without a nuclear membrane) that multiply rapidly

DNA or RNA is encased in a protein coating

Outside of a living host cell

Unicellular eukaryotic microorganisms (with a nuclear membrane) that can infect the blood, brain, intestines and other body areas

Are transmitted to humans by the bites of lice, ticks and fleas that act as vectors

Tiny primitive organisms, that contain no chlorophyll

Parasitic worms or flukes

A place where the pathogen grows and may or may not multiply

Patient, staff member, animal, food

An exit route for pathogens to leave its host

Blood, skin, mucous membranes, respiratory tract, genitourinary tract, and gastrointestinal tract

The manner in which an infectious agent moves from one source to another

Touch, airborne droplets, medical instruments, mosquitoes, vermin

Direct Contact

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Person to person or physical contact between source and susceptible host

Fecal, oral

Contact with contaminated inanimate objects

needles, utensils, hospital equipment

Through a bite

fleas, ticks, mosquitoes

When the droplets from an infected hosted person are projected a short distance to the host's nasal mucosa, mouth or conjunctiva

When infectious particles dispersed in the air enter the host by inhalation

coughing, sneezing

Place where a pathogen enters the body

break in skin, mucous membrane, mouth, nose, genitourinary tract

A personal who becomes ill after pathogens enter the body because they cannot fight off the pathogen

Intact skin

exit; entry

Virtue of age, weak state of health, or broken skin

Yes