Organisation and in vitro expression of esp genes of the LEE (locus of enterocyte effacement) of bovine enteropathogenic and enterohemorrhagic Escherichia coli40, Goffaux, F., China Bernard, and Mainil J.G. , Vet.Microbiol., 26/11/2001, Volume 83, Issue 3, Number 286, p.275 - 286, (2001)