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Air sampling recovered two STEC isolates from passive collectors; active samplers detected none
Summary
Researchers used passive cloth collectors (139 samples, 31 locations) and active mechanical samplers (173 samples, limited deployment) and recovered two STEC isolates from passive samplers and none from active samplers; presenters concluded that under current methods "air is a limited vector for STEC movement in this region."
Dr. Julie Case described two air sampling methods: passive cloth collectors deployed for 12'24 hours and active mechanical samplers run for roughly one hour. She reported that out of 139 passive'collector samples the team recovered two STEC isolates; the active samplers (173 samples at 6,000 liters of air per deployment) yielded no STEC isolates.
Case noted methodological limits: "we did not detect STEC in any of those" active samples and recommended that active samplers might be deployed longer to sample a larger volume of air in future studies. Summarizing, she said the results "suggest that air is a limited vector for STEC movement in this region," while leaving open that different deployment strategies could alter detection probabilities.
The presenters emphasized that indicator organism counts showed the samplers did recover bacteria, so negative STEC results from active samplers likely reflect low airborne STEC abundance under the chosen sampling durations and volumes rather than total method failure.
