Another organism, Lawsonia intracellularis, was isolated in the mid 1980s
from weanling ferrets with intestinal inflammation - and once from a pet ferret in 1989.
The pups are weaned in early October, and there weaned pups on land until early January, but the number of them increases sharply
from mid-October, and decreases sharply
from mid - December, see following graph of
weanlings on land.