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wellness exam


an invasion of body tissues by microorganisms that use the bodys environment to multiply and spread disease


disease-causing agent


the natural environment for any particular pathogen, where it accumulates in large numbers.

links in the chain

pathogen, reservoir, portal of exit, transmission, portal of entry, new host

indirect transmission

Touching contaminated objects
Breathing airborne pathogens
Bites from infected insects
Drinking or eating contaminated water or food

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