Extended-spectrum-beta-lactamase- and plasmid-encoded cephamycinase-producing enterobacteria in the broiler hatchery as a potential mode of pseudo-vertical transmission

An extended-spectrum beta-lactamases (ESBLs) and transferable (plasmid-encoded) cephamycinases (pAmpCs)-positive broiler parent flocks and their corresponding eggs, as well as various environmental and air samples from the hatchery, are analyzed. The eggs are investigated concerning ESBL-/pAmpC-producing enterobacteria on the outer eggshell surface (before/after disinfection), the inner eggshell surface, and the egg content. The results show a possible entry of ESBL-/pAmpC-producing enterobacteria from the parent flocks into the hatchery.