Emergence of ceftazidime/avibactam resistance in carbapenem-resistant Klebsiella pneumoniae in China.
Clin Microbiol Infect
; 26(1): 124.e1-124.e4, 2020 Jan.
Article
em En
| MEDLINE
| ID: mdl-31494252
ABSTRACT
OBJECTIVES:
The aim was to investigate the activity of ceftazidime/avibactam (CAZ/AVI) against carbapenem-resistant Klebsiella pneumoniae (CRKP) and identify the resistance mechanisms before CAZ/AVI coming to Chinese market.METHODS:
Clinical CRKP isolates were continuously collected from 36 tertiary hospitals in China from 1 March 2017 to 31 July 2017. CAZ/AVI MICs were determined by agar dilution method. CAZ/AVI resistant isolates were submitted to whole genome sequencing. The copy number and relative expression of blaKPC were determined by quantitative PCR.RESULTS:
A total of 872 CRKP isolates were collected, and MIC50 and MIC90 of CAZ/AVI were 4 and 8 mg/L. The resistant rate of CAZ/AVI was 3.7% (32/872). Among the resistant isolates, 53.1% (17/32) were metallo-ß-lactamase-producing K. pneumoniae (MBL-KP), 40.6% (13/32) were Klebsiella pneumoniae carbapenemase (KPC)-producing K. pneumoniae (KPC-KP) and 6.3% (2/32) produced both MBL and KPC. One of the KPC-KP with high level CAZ/AVI resistance (>128 mg/L) harboured mutated blaKPC-2 (D179Y). In 12 wild-type blaKPC-2 isolates, the relative copy number and expression of blaKPC-2 gene were 2.5-fold and 2.7-fold higher than that in the CAZ/AVI MIC ≤0.5 mg/L group (p < 0.05), and when added avibactam at a fixed concentration of 8 mg/L, 91.7% (11/12) isolates could restore susceptibility.CONCLUSIONS:
Resistance against CAZ/AVI in CRKP emerged before clinical use of CAZ/AVI in China, although most of the CRKP isolates maintained the susceptibility. MBL production, blaKPC-2 point mutation and high KPC expression played an important role in CAZ/AVI resistance.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Carbapenêmicos
/
Ceftazidima
/
Farmacorresistência Bacteriana Múltipla
/
Compostos Azabicíclicos
/
Klebsiella pneumoniae
/
Antibacterianos
Limite:
Humans
País/Região como assunto:
Asia
Idioma:
En
Revista:
Clin Microbiol Infect
Assunto da revista:
DOENCAS TRANSMISSIVEIS
/
MICROBIOLOGIA
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China