Apparently, fresh urine is not completely sterile, but almost sterile.
In the german Wikipedia, it says:
Da auch die untere Harnröhre nicht völlig keimfrei ist, enthält Urin beim Austritt bis zu 10.000 Keime pro Milliliter. Allerdings sind diese in der Regel gesundheitlich unbedenklich und indizieren in dieser geringen Konzentration insbesondere keine Antibiothika-Therapie.[65][66] Zum Vergleich: Speichel enthält rund 100 Millionen Keime pro Milliliter.[67]
Translation:
“Basically, urine contains 10^4 germs per millilitre. That’s very low count, considering saliva contains 10^8 germs per millilitre. […]”
(Translation by me)
I got that wrong in my head. Probably, everything is only almost sterile, not completely sterile, except if you look at another planet. But for practical purposes, the number of germs is often negligible.
Apparently, they used to pee on each other’s wounds in earlier times to disinfect wounds. Since pee was much closer to being sterile than anything else they had access to. So that’s where this thought comes from. (Source: Someone told me this years ago.)
Ok, thanks for the note.
Apparently, fresh urine is not completely sterile, but almost sterile.
In the german Wikipedia, it says:
Translation: “Basically, urine contains 10^4 germs per millilitre. That’s very low count, considering saliva contains 10^8 germs per millilitre. […]”
(Translation by me)
I got that wrong in my head. Probably, everything is only almost sterile, not completely sterile, except if you look at another planet. But for practical purposes, the number of germs is often negligible.
Apparently, they used to pee on each other’s wounds in earlier times to disinfect wounds. Since pee was much closer to being sterile than anything else they had access to. So that’s where this thought comes from. (Source: Someone told me this years ago.)