Risk Factors for <i>Salmonella</i> Detection in Commercial Layer Flocks in Spain.

A clear trend in positive sampling events as a function of flock size was not observed, although lower proportions of positive sampling events for Salmonella spp. were found in smaller flocks (9.4% in flocks with <10,000 birds compared to 16.3% in flocks with 10,000–32,055 birds and 11.4% in those with >32,055 birds), while the proportion of positive sampling events for target serovars was consistently around 2.0% for flocks with <32,055 birds and around 0.9% for those above that size ( Table 1 ).

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