[roughly]

Pandemics became a thing among humans when we moved into cities because the increase in population density meant the disease could spread faster than the population’s immunity could build. Chickens in the wild (insofar as “wild chicken” is a meaningful concept) indeed may not succumb to a pandemic, chickens in a factory farm spread disease rapidly amongst themselves.

[logicchains]

Factory farms have been around for almost a century and that hasn't happened. Nothing's changed now, there's absolutely no empirical evidence that such a thing is happening.

[knome]

you cannot be serious. disease among husbanded animal populations has been a problem since mankind began keeping animals. before vaccines, the only options available were cleanliness, inoculation, and culling, to include killing entire herds when even a single individual was found to carry a disease.

https://ourworldindata.org/how-rinderpest-was-eradicated

[klipt]

> Factory farms have been around for almost a century

So around the same time as the Spanish flu pandemic?