Bacteria infection revision
- Created by: cathal828
- Created on: 19-10-22 13:39
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- Bacterial infection
- Bacteria
- Prokaryotic
- no enclosed nucleus
- no mitochondria
- no membrane bound organelles
- Bacterial Structure and Functions
- Introduction to Bacteria
- Reproduce asexually by simple division of cells
- Reproduction of Bacteria
- rapid division
- rates surpassing the development of protective response
- Live in soil, water, or air
- Live as parasites of humans, animals & plants
- Many pathogenic bacteria reside in humans without causing disease –inadequate numbers or controlled by local defence mechanisms
- Can infect any area of the body
- Bacterial survival & growth depends on host’s defence mechanisms & bacteria’s ability to resist the defences
- Others reside in nature & cause infection by being ingested, entering wounds.
- Live as parasites of humans, animals & plants
- Prokaryotic
- Bacterial Pathogenesis: How Bacteria Cause Damage
- Invasion – direct confrontation with host’s primary defence mechanisms
- i.e antibodies & phagocytes
- Bacterial survival & growth depends on
- effectiveness of body’s defences
- the bacterium’s capacity to resist the defences
- Protection against phagocytosis - bacteria produce thick capsules of carbohydrate or protein – antiphagocytic
- injure cells, disrupt tissue & protect against inflammation
- by producing exotoxins
- Exotoxins = proteins released during bacterial growth – a poisonous substance
- Endotoxins
- released during lysis (destruction) of the bacteria
- = pyrogenic bacteria - they activate inflammatory response & produce fever
- released during lysis (destruction) of the bacteria
- by producing exotoxins
- combine with portions of the host’s antibodies & form a protective coat
- injure cells, disrupt tissue & protect against inflammation
- Protection against phagocytosis - bacteria produce thick capsules of carbohydrate or protein – antiphagocytic
- nutrient availability and multiply
- Invasion – direct confrontation with host’s primary defence mechanisms
- Bacteremia
- bacteria being transported in the blood
- infect other organs or multiplying in the blood (Sepsis)
- bacteria being transported in the blood
- Bacteria
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