From: Towards integrated surveillance-response systems for the prevention of future pandemics
Stage | Description |
---|---|
I | Pathogens that are present in animals but have not been detected in humans und natural conditions. |
II | Pathogens of animals that are transmitted from animals to humans, but are not transmitted between humans. |
III | Pathogens of animals that are transmitted from animals to humans. In humans they don’t transmit easily and soon die out. |
IV | Pathogens of animals that are transmitted to humans, leading to ongoing human to human transmission without the involvement of the animal host. |
V | Pathogens that are exclusive to humans. |