It’ll tend to change with things population, social conventions, etc. For the herd animal populations it was originally applied to you can pretty much ignore all of that but not for humans. Especially for things like coronaviruses with a high k where R0 is driven by the fat tail of the distribution. In a small village where most bat/human coronavirus crossovers tend to happen the village size limits how large a superspreader event can be. Not so in a city. And then you have things like Ebola spread being partially driven by funereal customs.
I guess a better way of putting that is that R0 is fixed for a particular population but humans are composed of many different populations, just like there are other populations of different species a virus can also infect which might have their own R0s as well.
It’ll tend to change with things population, social conventions, etc. For the herd animal populations it was originally applied to you can pretty much ignore all of that but not for humans. Especially for things like coronaviruses with a high k where R0 is driven by the fat tail of the distribution. In a small village where most bat/human coronavirus crossovers tend to happen the village size limits how large a superspreader event can be. Not so in a city. And then you have things like Ebola spread being partially driven by funereal customs.
I guess a better way of putting that is that R0 is fixed for a particular population but humans are composed of many different populations, just like there are other populations of different species a virus can also infect which might have their own R0s as well.