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Table 1 Description of ESBL-E isolates available for further study, obtained from horses during October 2011 – May 2014

From: Characterisation of and risk factors for extended-spectrum β-lactamase producing Enterobacterales (ESBL-E) in an equine hospital with a special reference to an outbreak caused by Klebsiella pneumoniae ST307:CTX-M-1

Bacterial species

Specimen type

Infection site (N = 25)

Isolates

N = 118 (%)

Rectal screeninga

N = 93 (%)

Infectionb

N = 25 (%)

Abscess

Blood

IV catheter

Udder

Respiratory tract

Surgical incision

Wound

Urine

K. pneumoniae n = 44 (37)

33 (35)

11 (44)

1

1

1

2

3

2

1

E. cloacae n = 31 (26)

20 (22)

11 (44)

9

2

E. coli n = 31 (26)

29 (31)

2 (8)

1

1

K. oxytoca n = 6 (5)

6 (6)

Citrobacter spp. n = 4 (3)

3 (3)

1 (4)

1

E. aerogenes n = 2 (2)

2 (2)

  1. aTwenty-six horses were asymptomatic carriers of two or three ESBL-E isolates (n = 49)
  2. bEleven horses had a clinical infection caused by two or three ESBL-E isolates (n = 13)
  3. Isolates of different species of extended-spectrum β-lactamase producing Enterobacterales (ESBL-E) were obtained from specimens originating from horses at the Equine Veterinary Teaching Hospital (EVTH) during the study period