Environmental contamination by E. coli and Salmonella
spp. is of concern because it causes health problems
for humans and other animals. Salmonella contamination
in the six sampled farms (three biogas and three nonbiogas
system farms) was restricted to the wastewater and
dry manure samples. Significantly, Salmonella contamination
was found in wastewater and dry manure from
these farms, along with far higher levels of E. coli the
housing for nursery piglets, although the frequency of
detection was lower than that in other sampled locations.
The contamination by Salmonella on farms may
come from public untreated water pumped onto farms,
contamination in nursery feeds, or cycling between the