an Entity references as follows:
Thrush is a very common bacterial infection that occurs on the hoof of a horse, specifically in the region of the frog. The bacterium involved is Fusobacterium necrophorum, and occurs naturally in the animal's environment—especially in wet, muddy, or unsanitary conditions, such as an unclean stall—and grows best with low oxygen. Horses with deep clefts, or narrow or contracted heels are more at risk of developing thrush.