AI Article Synopsis
- The study examined how distance from beef cattle feedlots and various environmental factors affect airborne bacteria.
- Over 6 months, 300 air samples were collected and analyzed for pathogens, but none were confirmed, although 16.7% of samples had detectable indicators.
- The findings suggest that being close to feedlots does increase the likelihood of airborne bacteria, but the absence of confirmed pathogens implies that this may not significantly contribute to contamination of leafy greens.
Article Abstract
This study characterized the effect of distance from beef cattle feedlots, environmental factors, and climate on the occurrence of airborne bacterial indicators and pathogens. Three hundred air samples were collected over 6 months from five feedlots, with each air sample comprising 6000 L of air. Air samples were processed onto TSB-enriched air filters, qPCR-screened, and then qPCR-confirmed for suspect positive colonies of O157, non-O157-Shiga-toxin-producing (STEC), , and . Direct enumeration of was also collected. Although no bacterial pathogens were qPCR-confirmed for the 300 samples, was detected in 16.7% (50/300) of samples, with an overall mean concentration of 0.17 CFU/6000 L air. Logistic regression analyses revealed a higher odds of for samples in close proximity compared to >610 m (2000 ft) distance from feedlots, along with significant associations with meteorological factors, sampling hour of day, and the presence of a dust-generating activity such as plowing a field or nearby vehicular traffic. The lack of bacterial pathogen detection suggests airborne deposition from nearby feedlots may not be a significant mechanism of leafy green bacterial pathogen contamination; the result of our study provides data to inform future revisions of produce-safety guidance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9961607 | PMC |
| http://dx.doi.org/10.3390/microorganisms11020411 | DOI Listing |
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