Infection

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Process of infection
There are four stages of progression of infection (from point
of view of microorganism)
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1. Colonization
Infectious microorganisms exist in reservoirs e.g.
environment (contaminated water, soil), animals, or infected humans.
2 of 5
2. Invasion
The infectious agent can invade surrounding tissues. Mechanisms are developed to penetrate tissues & avoid
host’s nonspecific and specific defenses.
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3. Multiplication
Bacteria undergo rapid multiplication – replicate within infected cells (viral pathogens); replicate in macrophages & other cells (bacterial pathogens)
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4. Spread
If the immune system is comprised then the infection may spread rapidly.
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Other cards in this set

Card 2

Front

Infectious microorganisms exist in reservoirs e.g.
environment (contaminated water, soil), animals, or infected humans.

Back

1. Colonization

Card 3

Front

The infectious agent can invade surrounding tissues. Mechanisms are developed to penetrate tissues & avoid
host’s nonspecific and specific defenses.

Back

Preview of the back of card 3

Card 4

Front

Bacteria undergo rapid multiplication – replicate within infected cells (viral pathogens); replicate in macrophages & other cells (bacterial pathogens)

Back

Preview of the back of card 4

Card 5

Front

If the immune system is comprised then the infection may spread rapidly.

Back

Preview of the back of card 5

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