Leptotrichia buccalisLeptotrichia buccalis is an anaerobic, Gram-negative rod bacteria. It is a constituent of normal oral flora.MorphologyLeptotrichia species are typically large, fusiform-shaped, non-sporulating, and non-motile rods.PathologyAlmost every case of severe infection with Leptotrichia buccalis reported in medical literature occurred in patients with neutropenia.