Signs of ill health
13/10/2022 10:04
Disease - any harmful deviation from the normal structural functional state of the organism
Mostly caused by viruses, bacteria or other pathogens.
• Pathogenic - causing or capable of causing disease. Caused by endo parasites and ecto
• Non pathogenic - incapable of causing disease. Caused by poor husbandry.
Disorder - mostly abnormalities such as birth defects, genetic malfunction, nutritional proble
What makes a micrograms pathogenic?
Invasiveness:
• pathogen able to spread through host body from site of entry
• Enter host tissues and multiply there
• Invasiveness depends on:
○ Host defences
○ Surface structure
○ Enzyme secretion
Toxigenicity
• Pathogens which are non invasive but cause their disease by their toxigenicity: they re
(chemicals) which are poisonous to the host.
The four types of pathogens are:
• Fungi
○ Spore - producing organisms
○ Feeds on organic matter
○ Grows rapidly
○ Develop through environmental and physiological conditions
○ Examples:
§ Chytridiomycosis
§ Ringworm
• Bacteria
○ Unicellular microorganisms
○ Microscopic
○ Outnumber every other organism
○ Examples:
§ Necrotic stomatitis
§ Pneumonia
• Virus
13/10/2022 10:04
Disease - any harmful deviation from the normal structural functional state of the organism
Mostly caused by viruses, bacteria or other pathogens.
• Pathogenic - causing or capable of causing disease. Caused by endo parasites and ecto
• Non pathogenic - incapable of causing disease. Caused by poor husbandry.
Disorder - mostly abnormalities such as birth defects, genetic malfunction, nutritional proble
What makes a micrograms pathogenic?
Invasiveness:
• pathogen able to spread through host body from site of entry
• Enter host tissues and multiply there
• Invasiveness depends on:
○ Host defences
○ Surface structure
○ Enzyme secretion
Toxigenicity
• Pathogens which are non invasive but cause their disease by their toxigenicity: they re
(chemicals) which are poisonous to the host.
The four types of pathogens are:
• Fungi
○ Spore - producing organisms
○ Feeds on organic matter
○ Grows rapidly
○ Develop through environmental and physiological conditions
○ Examples:
§ Chytridiomycosis
§ Ringworm
• Bacteria
○ Unicellular microorganisms
○ Microscopic
○ Outnumber every other organism
○ Examples:
§ Necrotic stomatitis
§ Pneumonia
• Virus
