Table 1.

E. coli genome assembly collection and metadata. The table shows the sample ID, SRA accession ID, ST131 Clade, bla _CTX-M allele(s), country and year of isolation, and numbers of unique AMR contigs in the preterm infant resistome. All seven ST131 assemblies, EC958 and NCTC13441 came from pathogenic UTIs. SE15 was a faecal commensal isolate. EC958 had 18 AMR contigs on plasmid pEC958A (pEC958B had none). NCTC13441 had 27 AMR contigs on its plasmid. The seven ST131 and two HMP samples were assembled from Illumina reads, and the three references were assembled from PacBio reads

Sample ID	SRA ID	ST131 clade or ST	bla CTX-M allele(s)	Country, year	Unique AMR contigs
8289_1#91	ERR191724	C1	14	Ireland, 2007	268
8289_1#35	ERR191668	C1	14	Ireland, 2008	270
8289_1#3	ERR191636	C2	15	Ireland, 2005	274
8289_1#34	ERR191667	C2	15	Ireland, 2010	274
8289_1#24	ERR191657	C2	14 and 15	Ireland, 2009	283
8289_1#60	ERR191693	C2	15	Ireland, 2010	262
8289_1#27	ERR191660	C2	15	Ireland, 2010	262
SE15	AP009378	A	none	Japan, 2010	251
NCTC13441	ERS530440	C2	15	UK, 2003	280
EC958	HG941718	C2	15	UK, 2005	291
3_2_53FAA	–	ST95	none	Canada, 2007	269
83 972	–	ST73	none	Sweden, 1978	213