The importance of meropenem resistance, rather than imipenem resistance, in defining carbapenem-resistant Enterobacterales for public health surveillance: an analysis of national population-based surveillance

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2024年2月15日

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Chiaki Ikenoue,
Mari Matsui,
Yuba Inamine,
Daisuke Yoneoka,
Motoyuki Sugai,
Satowa Suzuki,
Mari Matsui,
Satowa Suzuki,
Yohei Takahashi,
Nozomi Kamitaka,
Shiho Takahashi,
Nami Kanno,
Takuya Ishi,
Ryo Shimada,
Hiroko Takahashi,
Mayumi Ogawa,
Koji Kikuchi,
Hiroyuki Ueno,
Kentaro Tomari,
Junko Yoshihara,
Naoshi Ando,
Takako Katakura,
Yuko Matsumoto,
Yoko Anzawa,
Satoko Haruna,
Mikako Hosoya,
Masanori Watahiki,
Mika Shiroza,
Koji Yokoyama,
Makiko Noda,
Ayako Furuta,
Ryuji Kawahara,
Kaoru Umeda,
Takahiro Yamaguchi,
Noriko Nakanishi,
Kumiko Kuroda,
Etsuko Saito,
Yumiko Inoue,
Yuta Kawakami,
Tatsuaki Aota,
Kanako Masuda,
Hitoshi Ohtsuka,
Chiemi Fukuda,
Kazumi Seki,
Yoko Iwashita,
Yukiko Asano,
Yuka Fukuguchi,
Emi Arikawa,
Rika Maeda,
Tsuyoshi Kudeken

摘要

Background

In Japan, carbapenem-resistant Enterobacterales (CRE) infections were incorporated into the National Epidemiological Surveillance of Infectious Diseases (NESID) in 2014, necessitating mandatory reporting of all CRE infections cases. Subsequently, pathogen surveillance was initiated in 2017, which involved the collection and analysis of CRE isolates from reported cases to assess carbapenemase gene possession. In this surveillance, CRE is defined as (i) minimum inhibitory concentration (MIC) of meropenem ≥2 mg/L (MEPM criteria) or (ii) MIC of imipenem ≥2 mg/L and MIC of cefmetazole ≥64 mg/L (IPM criteria). This study examined whether the current definition of CRE surveillance captures cases with a clinical and public health burden.

Methods

CRE isolates from reported cases were collected from the public health laboratories of local governments, which are responsible for pathogen surveillance. Antimicrobial susceptibility tests were conducted on these isolates to assess compliance with the NESID CRE definition. The NESID data between April 2017 and March 2018 were obtained and analyzed using antimicrobial susceptibility test results.

Results

In total, 1681 CRE cases were identified during the study period, and pathogen surveillance data were available for 740 (44.0%) cases. Klebsiella aerogenes and Enterobacter cloacae complex were the dominant species, followed by Klebsiella pneumoniae and Escherichia coli. The rate of carbapenemase gene positivity was 26.5% (196/740), and 93.4% (183/196) of these isolates were of the IMP type. Meanwhile, 315 isolates were subjected to antimicrobial susceptibility testing. Among them, 169 (53.7%) fulfilled only the IPM criteria (IPM criteria-only group) which were susceptible to meropenem, while 146 (46.3%) fulfilled the MEPM criteria (MEPM criteria group). The IPM criteria-only group and MEPM criteria group significantly differed in terms of carbapenemase gene positivity (0% vs. 67.8%), multidrug resistance rates (1.2% vs. 65.8%), and mortality rates (1.8% vs 6.9%).

Conclusion

The identification of CRE cases based solely on imipenem resistance has had a limited impact on clinical management. Emphasizing resistance to meropenem is crucial in defining CRE, which pose both clinical and public health burden. This emphasis will enable the efficient allocation of limited health and public health resources and preservation of newly developed antimicrobials.