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Prevalence of C. jejuni -positive samples in wild birds according to different characteristics: (1) bird species, (2) bird family, (3) migratory behaviour, (4) social behaviour, (5) food diet, (6) localization of their food and (7) sampling month. Prevalence is estimated based on at least five samples corresponding to a characteristic. Characteristics sharing the same letter have no statistically different C. jejuni prevalence (chi-squared test, Bonferroni correction, P=0.05).
