Table 1. Major features of the genome of E. coli NCTC 86 and several archetypal E. coli strains.

Characteristic	E. coli strain
	NCTC 86	MG1655	O157 : H7	E24377A	042	CFT073
Aetiology	Commensal	Laboratory	EHEC	ETEC	EAEC	UPEC
Size (bp)	5 144 392	4 641 652	5 594 477	5 249 288	5 241 977	5 231 428
Plasmids	None	None	pO157, pOSAK1	pETEC_5, pETEC_6, pETEC_35, pETEC_73, pETEC_74, pETEC_80	pAA	None
Predicted CDSs	4805	4377	5292	4991	4810	5533
G+C mol%	50.6	51.1	50.4	50.6	50.56	50.47
tRNA	69	86	103	63	93	89
rRNA	22	22	22	22	22	22

EAEC, Enteroaggregative E. coli; EHEC, enterohaemorrhagic E. coli; ETEC, enterotoxigenic E. coli.