节瘤偶蹄形菌 (Dichelobacter nodosus)，腐蹄病病变胀，绵羊
Photomicrograph of a swab smear taken from a footrot lesion in a sheep demonstrating Dichelobacter nodosus organisms. Note classic swollen ends of the organism that is sometimes (as here) characteristically surrounded by adherent, unidentified gram-negative rods. Gram stain; original magnification, 40×.
Courtesy of Dr. John Prescott.
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