Table 2

Detection frequencies of ESBL/AmpC-producing E. coli (mean values) in samples from the housing environments of all investigated farms

Source of ESBL/AmpC-positive samples (three samplings each)% ESBL/AmpC-positive samples (total no.) for all farms/all samplingsDetection frequency for farma:
Pooled feces100 (20)+++++++++++++++o+++++
Litter95.2 (18)+++++++++++++++−+++++
Boot swabs90.4 (21)++++++++++++−++−+++++
Pooled dust71.4 (21)+++++++++−+++−+−+++−+
Environmental swabs54.2 (83)+++++++++++++++−−++++
  • a Each sign represents one sampling date; +, positive for ESBL/AmpC-producing E. coli; −, negative for ESBL/AmpC-producing E. coli; o, sample not taken.