The dissemination of antimicrobial-resistance is a major global threat affecting both human and animal health. Carbapenems are human use β-lactams of last resort; thus the dissemination of carbapenemase-producing (CP) bacteria creates severe limitations for the treatment of multidrug-resistant bacteria in hospitalized patients. Even though carbapenems are not routinely used in veterinary medicine, reports of infection or colonization by carbapenemase-producing Enterobacterales in companion animals are being reported. NDM-5 and OXA-48-like carbapenemases are among the most frequently reported in companion animals. Like in humans, Escherichia coli and Klebsiella pneumoniae are the most represented CP Enterobacterales found in companion animals, alongside with Acinetobacter baumannii. Considering that the detection of carbapenemase-producing Enterobacterales presents several difficulties, misdiagnosis of CP bacteria in companion animals may lead to important animal and public-health consequences. It is of the upmost importance to ensure an adequate monitoring and detection of CP bacteria in veterinary microbiology in order to safeguard animal health and minimise its dissemination to humans and the environment.
1. Introduction
Carbapenems are β-lactam antibiotics with broad antimicrobial spectrum. With the emergence of Extended Spectrum β-lactamases (ESBLs), carbapenems became the antibiotics of last resort for treatment of human patients with ESBL-producing Enterobacterales infections
[1]. Although carbapenems are not hydrolysed by most β-lactamases, their effectiveness was seriously compromised by the emergency of carbapenem-hydrolysing enzymes, the carbapenemases
[1,2][1][2]. The most important carbapenemases belong to three different Amber classes
[2]: (i) class A, including the KPC, IMI/NMC, SFC, GES type enzymes
[1,2][1][2]; (ii) class B, including VIM, IMP, and NDM metallo-β-lactamases (MBL)
[3]; and (iii) class D, including OXA-48-like type enzymes
[4].
Regulation on the use of carbapenems in animals varies worldwide and they do not belong to the OIE List of Antimicrobial Agents of Veterinary Importance
[5]. According to the European Medicine Agency categorization of antibiotics for animal use, carbapenems are included in category A (“Avoid”), meaning they are not authorized for use in veterinary medicine in the European Union (EU), except in exceptional clinical cases in companion animals, under the cascade according to Article 112 of the veterinary medicinal products Regulation 2019 of the European Union Legislation
[6]. Reports of carbapenemase-producing (CP) and carbapenem-resistant Enterobacterales (CRE) detection among companion animals are emerging worldwide (
Table 1). The identification of CP bacteria in companion animals, which have significant direct contact with humans, has raised public health concern as animals may constitute an important reservoir of carbapenems resistance genes and contribute to its dissemination
[7]. Very recently, the building of an European Antimicrobial Resistance Surveillance network in veterinary medicine (EARS-Vet) has been reported
[8]. However, carbapenem resistance epidemiology remains quite unknow, as, unlike in human medicine, no global surveillance protocol is currently in place for companion animal veterinary medicine. Furthermore, the detection of CP bacteria relying on antimicrobial susceptibility testing alone (AST) presents several pitfalls leading to its possible miss detection in veterinary medicine. Appropriate monitoring and detection of antimicrobial resistance against these critically important antimicrobials in veterinary medicine is of the utmost importance to avoid treatment failure and prevent its dissemination to humans and the environment. However, there is a lack of recommendations directed specifically to the veterinary medicine needs in the published literature.
2. Carbapenemase-Producing Bacteria in Companion Animals
To
ouresearcher
s' best knowledge, more than 25 reports of CP bacteria in dogs and cats have been published worldwide. These include, both infection and colonization CP isolates harbouring KPC, VIM, IMP, NDM, or OXA β-lactamases (
Table 1).
Briefly, three studies detected KPC-producing
Escherichia coli and
Klebsiella pneumoniae from dogs in Brazil and in
Enterobacter xiangfangensis from a dog in the United States
[9,10,11][9][10][11]. A IMP-4-enzyme in
Salmonella isolates was recovered from a cat’s faecal samples in Australia
[12], VIM-2 in
Pseudomonas aeruginosa from dogs with pyoderma and otitis in South Korea
[13] and VIM-1 in
K. pneumoniae from dogs in Spain
[14]. A number of NDM-5-producing
E. coli have been found in dogs and cats
[15,16,17,18[15][16][17][18][19][20][21][22],
19,20,21,22], one NDM-1-producing
Acinetobacter radioresistens was detected in a dog, six NDM-1-producing
E. coli from dogs and cats in the United States, two NDM-1-producing
E. coli from a dog in China, and finally one NDM-9 from a farm dog in China
[23,24,25][23][24][25]. Several OXA-48-like carbapenemase-producing
E. coli,
K. pneumoniae, Klebsiella oxytoca, and
Enterobacter cloacae isolates were recovered from dogs, cats, and horses, representing one of the most frequent carbapenemases detected in companion animals alongside with NDM-5 (
Table 1)
[17,26,27,28,29,30,31,32][17][26][27][28][29][30][31][32]. In addition, OXA-23- and OXA-66-producing
Acinetobacter baumannii were isolated from clinical samples from dogs and cats
[23,33,34][23][33][34].
Interestingly, although the detection of CP bacteria in companion animals dates to at least 2009, detection methods vary widely between studies, with the use of selective culture media being the most frequent for the detection of commensal CP isolates, while antimicrobial susceptibility testing alone (AST) is the main method used for the detection of CP isolates in infection cases (
Table 1). Another important finding is that most CP bacterial species isolated from companion animals belong to the priority 1 (“critical”) category within the WHO priority pathogens list
[35], thus highlighting the importance of properly monitoring and effectively detecting these carbapenem resistance mechanisms in companion animals.
Table 1.
Carbapenemases found in companion animals across the world.
| Enzyme |
Year |
Country |
Host |
Source |
Bacterial Species |
Detection Methods |
Refs. |
Table 2).
Table 2.
Common β-lactam hydrolysis profile of carbapenemases.
Amber Class |
Representative Carbapenemase Type |
Hydrolysis Profile |
Refs. |
Narrow Spectrum Cephalosporins |
Extended Spectrum Cephalosporins |
Imipenem * |
Meropenem * |
| IMP-4 |
2016 |
Australia |
Cats |
Commensal |
Salmonella enterica serovar Typhimurium |
AST |
[12] |
| Class A |
KPC |
+ |
+ |
+ |
+ |
[2,9][2][9] |
| KPC-2 |
2018 |
Brazil |
Dog |
Infection (UTI) |
Escherichia coli |
Imipenem synergy test, modified Hodge testing, PCR |
[9] |
| Class B |
IMP, VIM, NDM, |
+ |
+ |
+ |
+ |
[3] |
KPC-2 |
2021 |
Brazil |
Dog |
Infection (UTI) |
Klebsiella pneumoniae |
Imipenem synergy test, AST |
[ |
| Class D |
OXA-48-like | 10 |
+ |
- |
Variable 1 | ] |
| - |
[ | 4 | , | 38 | , | 39][4][38][39] |
KPC-4 |
2018 |
USA |
Dog |
Infection (UTI, SSTI) |
Enterobacter xiangfangensis |
Biochemical Tests |
[11 |
| OXA-23-like | ] |
| + |
+ |
+ |
+ |
[ | 4] |
NDM-1 |
2013 |
United States |
Dogs, Cats |
Infection (SSTI, UTI) |
Escherichia coli |
AST |
[24] |
| NDM-1 |
2017 |
China |
Dogs |
Commensal |
Escherichia coli |
Selective culture media |
[16,25][16][25] |
| NDM−1 |
2018 |
Italy |
Dog |
Commensal |
Acinetobacter radioresistens |
Selective culture media |
[23] |
| NDM-5 |
2016 |
Algeria |
Dogs |
Commensal |
Escherichia coli |
PCR |
[17] |
| NDM-5 |
2017 |
China |
Dogs |
Commensal |
Escherichia coli |
Selective culture media |
[16] |
| NDM-5 |
2019 |
United Kingdom |
Dog |
Infection (SSTI) |
Escherichia coli |
AST |
[19] |
| NDM-5 |
2018 |
Finland |
Dogs |
Infection (Otitis externa) |
Escherichia coli |
AST followed by modified Hodge testing, UV spectrometric detection of imipenem hydrolysis |
[18] |
| NDM-5 |
2021 |
Italy |
Dog |
Infection (UTI) |
Escherichia coli |
Meropenem synergy test |
[15] |
| NDM-5 |
2018 |
United States |
Dog |
Infection (URTI) |
Escherichia coli |
AST |
[20] |
| NDM-5 |
2018 |
United States |
Dogs, Cats |
Infection (UTI, URTI) |
Escherichia coli |
AST |
[22] |
| NDM-5 |
2018 |
South Korea |
Dog, Cat |
Commensal |
Escherichia coli |
AST, PCR |
[21] |
| NDM-9 |
2017 |
China |
Dog |
Commensal |
Escherichia coli |
Selective culture media |
[16] |
| OXA-48 |
2009–2010 |
Germany |
Dogs, Cats, Horses |
Infection |
Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae |
Selective culture media for cephalosporin resistance, PCR |
[36] |
| OXA-48 |
2013 |
Germany |
Dog |
Commensal, Infection (UTI, SSTI, URTI, CRBSI) |
Klebsiella pneumoniae, Escherichia coli |
AST |
[29] |
| OXA-48 |
2016 |
United States |
Dogs, Cats |
Infection (UTI, SSTI, Genital tract) |
Escherichia coli |
AST |
[31] |
| OXA-48 |
2016 |
Algeria |
Dogs |
Commensal |
Escherichia coli |
PCR |
[17] |
| OXA-48 |
2017 |
Algeria |
Dogs, Cat, Horses, Pet birds |
Commensal |
Enterobacter cloacae, Escherichia coli, Klebsiella pneumoniae |
Selective culture media |
[32] |
| OXA-48 |
2017 |
France |
Dog |
Commensal |
Escherichia coli |
Selective culture media |
[30] |
| OXA-48 |
2018 |
Germany |
Dogs, Cats, Horses |
Infection (UTI, SSTI, genital tract, otitis, URTI) |
Klebsiella pneumoniae, Enterobacter cloacae, Escherichia coli, Klebsiella oxytoca |
Selective culture media |
[28] |
| OXA-181 |
2018 |
Switzerland |
Dogs, Cats |
Commensal |
Escherichia coli |
Selective culture media |
[26] |
| OXA-181 |
2020 |
Portugal |
Dog |
Commensal |
Escherichia coli |
Selective culture media and AST |
[27] |
| OXA-181 |
2021 |
Portugal |
Cat |
Infection (SSTI) |
Klebsiella pneumoniae |
Selective culture media and AST |
[37] |
| OXA-23 |
2014 |
Portugal |
Cat |
Infection (UTI) |
Acinetobacter baumannii |
AST |
[33] |
| OXA-23 |
2017 |
Germany |
Dogs, Cats |
Infection (UTI, suppurate inflammation) |
Acinetobacter baumannii |
Selective culture media |
[34] |
| OXA−23 |
2018 |
Italy |
Dogs, Cats |
Commensal |
Acinetobacter baumanni |
Selective culture media |
[23] |
| OXA-66 |
2017 |
Germany |
Dogs, Cats |
Infection (UTI, SSTI, URTI, CRBSI, suppurate inflammation) |
Acinetobacter baumannii |
Selective culture media |
[34] |
| VIM-1 |
2016 |
Spain |
Dog |
Commensal |
Klebsiella pneumoniae |
Selective culture media, Meropenem synergy test |
[14] |
| VIM-2 |
2018 |
South Korea |
Dog |
Infection (SSTI) |
Pseudomonas aeruginosa |
AST |
[13] |