@cstross@wandering.shop @quinn@social.circl.lu Horses are resistant to TB. Horse manure has never been a major vector. The major vector has always been other people (airborne), followed by unpasteurised cow's milk ... So TB is likely to make a comeback in the US soon. Cow manure trails far behind as a cause of transmission. It's also not a disease of the past. Though we've had an effective TB treatment for over half a century, it's still the #1 pathogenic killer worldwide. That's because we've made the diagnosis and treatment unaffordable for most. For rich countries it's something we don't have to worry about; for everyone else it's the thing you dread, the thing your children or siblings waste away from because they can't afford enough food to keep their immune system strong enough to fight it off.