E. coli O104:H4 is difficult to treat as it is resistant to many antibiotics, although it is susceptible to carbapenems.
Escherichia coli O104:H4
Escherichia coli O104:H21
Escherichia coli O121
Escherichia coli O157:H7
Enteroaggregative Escherichia coli
Campylobacter upsaliensis
Salmonella enterica subsp. enterica
Salmonella