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Susceptibilities of C. jejuni strains to antimicrobial agents. The disk diffusion method was used to compare the susceptibilities of strains 81-176 (black), 81-176cj0596 (white) and 81-176cj0596+ (gray) to ampicillin (6.3 ng/disk), ethidium bromide (3.1 ng/disk), and vancomycin (500 ng/disk). Susceptibilities are expressed as the radius of the zone of inhibition by each compound, and statistical significance is represented by one asterisk (p <0.05) or two asterisks (p <0.001).
