TABLE 4.

MIC distributions and resistance rates of C. coli and other Campylobacter species isolated from conventional and organic poultry farmsa

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  • a Thin vertical lines indicate the breakpoint between susceptible and intermediate strains. Thick vertical lines indicate the breakpoint between intermediate and resistant strains (except for nalidixic acid, for which it indicates the breakpoint between susceptible and resistant strains).

  • b Campylobacter isolates from conventional poultry farms (n = 128).

  • c Campylobacter isolates from organic poultry farms (n = 115).

  • d Different symbols between operation types (conventional and organic) indicate a significant difference (P < 0.05) by a chi-square test with Yates' correction for continuity.