What structures are involved in thrush?

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Thrush is an infection that takes hold in the frog area of the hoof. The structures involved are the horny frog, the frog sulci, and the frog corium. The horny frog is the keratinized, visible part; the frog sulci are the grooves where debris and moisture can collect, creating an ideal environment for bacteria; the frog corium is the living tissue beneath the frog that can become damaged when infection sets in. While the hoof wall, sole, and lamina play other roles in hoof health, they’re not the primary sites of thrush, and the digital cushion isn’t the focus of this condition.