I don't think bumblefoot is from the type of staff from the soil. I think it is one that is in the body. How would you explain birds from overseas having it (that we send to each other; not fly over there by themselves)? After 3 months over there and 3 months over here been in quarantine? You think they don't clean exhibits in every inch for "dirt"?
Nah; we don't have pink-eye. For real. It's just not HERE. Not in the population. It's just simple. Different isles over the world have different spreadable "diceases".
And it is ALL no shame.
Noy sure how my English skills are relevant to your experiences; and no; it has nothing to do with weight. The ones I have ever known (ever!) where light pidgeons and light chickens. It's not a weight or soil thing. I'm 100% sure my allways-wet soil is way more ready for bacteria.. it's a perfect soil-country for bacteria!
Mark my words; it's the stass type that's just passed on by blood. Does not matter. Just like a herpes-mouth-sore; it's annoying. But you can be fine humans/ducks/chicken.
Unless someone is open to do something grans with mutliple breeders; importing ducks/chicken from other countries; and start a whole new line; and try to keep that healthy without inbreeding.. anyone got a few 10000 dollars left?