Five swine finishing buildings were identified in which Salmonella organisms were recovered from pen fecal samples. On a weekly basis for 5 weeks,
fecal samples were collected from the pens, dust levels were recorded for a 24-hour period both inside and outside the building, and air was sampled both inside and outside the building by drawing it through filters for a 24-hour period. The filter papers were then cultured for salmonellae and Escherichia coli. E. coli organisms were recovered from some of the indoor and outdoor filters. No Salmonella spp were isolated from either the indoor or outdoor filters at any of the five Salmonella fecal-positive facilities. Dust levels varied markedly between facilities but were unrelated to the
finding of E. coli organisms on the filter papers.