Process of infection

Created by: Leahs19
Created on: 20-03-24 23:18

1. Colonization

Infection microorganisms exists in reservoirs eg. Environment ( contaminated water) animals or infected human.
Transmitted via direct contact or indirectly by vectors ( insects- bites or stings) or direct exposure by food (salmonella)
Human to human trans

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2. Invasion

Infectious agent can invade surrounding tissues/ other sites
Developed mechanisms to penetrate tissues and avoid non specific and specific defensives (inflammation and immunity)

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3. Multiplication

Warm, nutrient filled host environment
Undergo rapid multiplication - replicated within infected cells (viral pathogens)- replicated in macrophages and other cells (bacterial pathogens)

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4. Spread

Produce localised infections without spread to other regions of the body.
Others are highly invasive - may enter lymphatics, blood or internal organs
Successful spread relies on factors adhesion molecules, toxins and protection against host's inflammatory

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Course of infection

Colonisation ➡️ invasion ➡️ proliferation ➡️ transmission

Evasion of immune system

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Other cards in this set

Card 2

Front

Infectious agent can invade surrounding tissues/ other sites
Developed mechanisms to penetrate tissues and avoid non specific and specific defensives (inflammation and immunity)

Back

2. Invasion

Card 3

Front

Warm, nutrient filled host environment
Undergo rapid multiplication - replicated within infected cells (viral pathogens)- replicated in macrophages and other cells (bacterial pathogens)

Back

Card 4

Front

Back

Card 5

Front

Colonisation ➡️ invasion ➡️ proliferation ➡️ transmission

Evasion of immune system

Back

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Process of infection