It was also interesting to observe that the seasonal indices for domestic and imported leafy vegetables were very similar, indi- cating that the trend in bacterial contamination did not differ based on the product origin.
Bacterial contamination in leafy herbs appeared to fluctuate over time, but no remarkable seasonal trend could be observed. Generally speaking, of the commodity groups investigated in these surveys, leafy herbs were the most contaminated and the data seem to indicate that this trend is fairly consistent throughout the seasons.
Detection of bacterial pathogens and generic E. coli (at levels above 100 CFU or MPN/g) was so seldom in the other commodity groups studied that, not surprisingly, no particularly notable events in bacterial contamination emerged. Considering that tomatoes have been involved in multiple major outbreaks of Salmonella infection in North America (Hanning et al., 2009), it is quite remarkable that none of the 4837 samples collected over three years of surveillance presented any contamination with the bac- teria examined.
It was also interesting to observe that the seasonal indices for domestic and imported leafy vegetables were very similar, indi- cating that the trend in bacterial contamination did not differ based on the product origin.Bacterial contamination in leafy herbs appeared to fluctuate over time, but no remarkable seasonal trend could be observed. Generally speaking, of the commodity groups investigated in these surveys, leafy herbs were the most contaminated and the data seem to indicate that this trend is fairly consistent throughout the seasons.Detection of bacterial pathogens and generic E. coli (at levels above 100 CFU or MPN/g) was so seldom in the other commodity groups studied that, not surprisingly, no particularly notable events in bacterial contamination emerged. Considering that tomatoes have been involved in multiple major outbreaks of Salmonella infection in North America (Hanning et al., 2009), it is quite remarkable that none of the 4837 samples collected over three years of surveillance presented any contamination with the bac- teria examined.
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