Fig. 1

PFGE patterns of E. coli strains from four participant groups. a Preschool children (3–6 years old). Lanes: 1, Concatenated λ DNA as molecular size marker; 2, ccpm4786; 3, ccpm4787; 4, ccpm4788; 5, ccpm4789; 6, ccpm4790; 7, ccpm4791; 8, ccpm4792; 9, ccpm4793; 10, ccpm4794; 11, ccpm4795; 12, ccpm4796; 13, ccpm4797; 14, ccpm4798; 15, ccpm4799; 16, ccpm4800; 17, ccpm4801; 18, ccpm4802; 19, ccpm4803; 20, ccpm4804; 21, ccpm4805; 22, ccpm4806; 23, ccpm4807; 24, ccpm4808; 25, ccpm4809; 26, ccpm4834; 27, ccpm4835; 28, ccpm4836; 29, ccpm4837; 30, ccpm4838; 31, ccpm4839; 32, ccpm4840; 33, ccpm4841; 34, ccpm4842; 35, ccpm4843; 36, ccpm4844; 37, ccpm4845. b University students (17–22 years old). Lanes: 1, Concatenated λ DNA as molecular size marker; 2, ccpm5554; 3, ccpm5555; 4, ccpm5556; 5, ccpm5557; 6, ccpm5558; 7, ccpm5559; 8, ccpm5560; 9, ccpm5561; 10, ccpm5562; 11, ccpm5563; 12, ccpm5564; 13, ccpm5565; 14, ccpm5566; 15, ccpm5567; 16, ccpm5568; 17, ccpm5569; 18, ccpm5570; 19, ccpm5571; 20, ccpm5572; 21, ccpm5573; 22, ccpm5574; 23, ccpm5575; 24, ccpm5576; 25, ccpm5577; 26, ccpm5578; 27, ccpm5579; 28, ccpm5580; 29, ccpm5581; 30, ccpm5582; 31, ccpm5583; 32, ccpm5584; 33, ccpm5585; 34, ccpm5586; 35, ccpm5587; 36, ccpm5588; 37, ccpm5589. c Senior individuals (90–106 year old). Lanes: 1, Concatenated λ DNA as molecular size maker; 2, 9-MK1; 3, 9-MK2; 4, 9-MK3; 5, 9-MK4; 6, 9-MK5; 7, 9-MK6; 8, 9-MK7; 9, 9-MK8; 10, 9-CB1; 11, 9-CB2; 12, 9-CB3; 13, 9-CB4; 14, 9-CB5; 15, 9-CB6; 16, 9-CB7; 17, 9-CB8; 18, 11-MK1; 19, 11-MK2; 20, 11-MK3; 21, 11-MK4; 22, 11-MK5; 23, 11-MK6; 24, 11-MK7; 25, 11-MK8; 26, 11-CB1; 27, 11-CB2; 28, 11-CB3; 29, 11-CB4; 30, 11-CB5; 31, 11-CB6; 32, 11-CB7; 33, 11-CB8; 34, 15-MK1; 35, 15-MK2; 36, 15-MK3; 37, 15-MK4; 38, 15-MK5; 39, 15-MK6. d CRC cancer patients (34–77 years old). Lanes: 1, Concatenated λ DNA as molecular size maker; 2, ccpm6546; 3, ccpm6547; 4, ccpm6548; 5, ccpm6549; 6, ccpm6550; 7, ccpm6551; 8, ccpm6552; 9, ccpm6553; 10, ccpm6554; 11, ccpm6555; 12, ccpm6556; 13, ccpm6557; 14, ccpm6558; 15, ccpm6559; 16, ccpm6560; 17, ccpm6561; 18, ccpm6562; 19, ccpm6563; 20, ccpm6564; 21, ccpm6565; 22, ccpm6566; 23, ccpm6567; 24, ccpm6568; 25, ccpm6569; 26, ccpm6570; 27, ccpm6571; 28, ccpm6572; 29, ccpm6573; 30, ccpm6574; 31, ccpm6575; 32, ccpm6576; 33, ccpm6577; 34, ccpm6578; 35, ccpm6579; 36, ccpm6580; 37, ccpm6581