- pathogen leaves host resevoir and moves to another through a mode of transmission ie. airbourne, contact, vector etc

- where a pathogen normally occurs - they can be animal (including human) or environmental (e.g. the soil) - not always symptomatic

What is the portal of exit?

- route by which a pathogen escapes - usually go via route they typically infect ie. respiratory pathogens are airbourne - exception is faecal-oral route

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Parasite/pathogen

Transmission chains

Question	Answer
Disease transmission	- pathogen leaves host resevoir and moves to another through a mode of transmission ie. airbourne, contact, vector etc
What are resevoirs?	- where a pathogen normally occurs - they can be animal (including human) or environmental (e.g. the soil) - not always symptomatic
What is the portal of exit?	- route by which a pathogen escapes - usually go via route they typically infect ie. respiratory pathogens are airbourne - exception is faecal-oral route