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Table 4 The MDR/ XDR phenotype of InPEC and ExPEC isolates against antimicrobial agents of different classes

From: Genetic diversity and multidrug resistance of phylogenic groups B2 and D in InPEC and ExPEC isolated from chickens in Central China

Type of resistance

Resistance patterns

Numer

ExPEC

InPEC

total

XDR

Resistance to at least one antimicrobial agents of eight antimicrobial classes

CTX/ CTX, CAZ + KF/ KF, CXM + TZP + FOX + AZT + STR, CN, KAN, SH + CIP, ENR + NA

0

1

1

XDR

Resistance to at least one antimicrobial agents of seven antimicrobial classes

CTX/ FEP, CTX, CAZ/ CTX, CAZ + KF, CXM + TZP + AZT + STR/ STR, CN, KAN, SH/ STR, SH, KAN/ SH, CN, AMI + CIP, ENR/ ENR + NA

4

1

5

MDR

Resistance to at least one antimicrobial agents of six antimicrobial classes

CAZ/ CTX + KF/ KF, CXM + TZP + STR, KAN/ STR, KAN, AMI / STR, SH, CN, KAN + ENR / ENR, CIP + NA

FEP, CTX, CAZ + KF, CXM + TZP + FOX + AZT + STR, SH, CN, KAN

3

0

3

MDR

Resistance to at least one antimicrobial agents of five antimicrobial classes

CAZ + KF + TZP + FOX +NA

CTX + KF, CXM + TZP + AZT + STR

2

0

2

MDR

Resistance to at least one antimicrobial agents of four antimicrobial classes

CTX + STR + CIP / CIP, ENR + NA

FEP, CTX, CAZ + KF, CXM + FOX + STR

CTX + KF, CXM + TZP + ARE, CN, KAN

KF + STR, KAN + ENR, CIP + NA

4

1

5

MDR

Resistance to at least one antimicrobial agents of three antimicrobial classes

TZP + STR, KAN + NA

CAZ + STR, CN + NA

KF / STR / STR, KAN / CN + CIP, ENR + NA

6

1

7

  1. Resistance breakpoints were Ceftazidime (CAZ, ≤17 mm), Cefoxitin (FOX, ≤14 mm), Cefepime (FEP, ≤14 mm), Cefotaxime (CEF,≤22 mm), Cefuroxime (CXM, ≤14 mm), Piperacillin (TZP, ≤17 mm), Aztreonam (AZT, ≤17 mm), Cephalothin (KF, ≤14 mm), Amikacin (AMI, ≤12 mm), Kanamycin (KAN, ≤13 mm), Streptomycin (STR, ≤11 mm), Gentamicin (CN, ≤12 mm), Spectinomycin (SH, ≤14 mm), Ciprofloxacin (CIP, ≤15 mm), Nalidixic acid (NA, ≤13 mm), Enrofloxacin (ENR, ≤15 mm) (Clinical and Laboratory Standards Institute, 2017)