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Fusobacterium egg yolk agar is a new medium selective for Fusobacterium species and differential for Fusobacterium necrophorum. The medium is a Brucella Agar base (Difco Laboratories, Detroit, Mich.) containing vancomycin, neomycin, josamycin, and egg yolk. ARl species of fusobacteria grew with only minimal inhibition. The mean logo difference in counts between Fusobacterium egg yolk agar and control media for 30 strains of seven species of fusobacteria was 0.1922. F. necrophorum typically showed a strong lipase reaction. Most other organisms were significantly inhibited by the medium. Fusobacteria are frequently isolated from clinically significant anaerobic infections (1, 2, 4). Fusobacteria have been involved in oral and dental infections, peritonsillar abscesses, brain abscesses, aspiration pneumonia, lung abscesses, empyema, hepatic abscesses, intraabdominal abscesses, septicemia, and endocarditis, as well as other less common infections. Several species of

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