The increased frequency of methicillin-resistant Staphylococcus aureus with low MIC of beta-lactam antibiotics isolated from hospitalized patients

Methicillin-resistant Staphylococcus aureus (MRSA) causes severe infectious diseases and can be life-threatening in healthcare-settings. MRSA is classified into health-care associated (HA)-MRSA strains and community acquired (CA)-MRSA strains based on genotype and phenotype. CA-MRSA has been reporte...

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Veröffentlicht in:Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy 2020-06, Vol.26 (6), p.604-610
Hauptverfasser: Iwata, Yasunori, Sakai, Norihiko, Yoneda, Ikuko, Satou, Kenji, Furuichi, Kengo, Senda, Yasuko, Sakai-Takemori, Yukiko, Wada, Taizo, Fujita, Shinichi, Ogura, Hisahiro, Sato, Kouichi, Minami, Taichiro, Yamaguchi, Kaori, Kitajima, Shinji, Toyama, Tadashi, Yamamura, Yuta, Miyagawa, Taro, Hara, Akinori, Shimizu, Miho, Sakai, Yoshio, Ikeo, Kazuho, Shichino, Shigeyuki, Ueha, Satoshi, Nakajima, Takuya, Matsushima, Kouji, Wada, Takashi
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container_title Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy
container_volume 26
creator Iwata, Yasunori
Sakai, Norihiko
Yoneda, Ikuko
Satou, Kenji
Furuichi, Kengo
Senda, Yasuko
Sakai-Takemori, Yukiko
Wada, Taizo
Fujita, Shinichi
Ogura, Hisahiro
Sato, Kouichi
Minami, Taichiro
Yamaguchi, Kaori
Kitajima, Shinji
Toyama, Tadashi
Yamamura, Yuta
Miyagawa, Taro
Hara, Akinori
Shimizu, Miho
Sakai, Yoshio
Ikeo, Kazuho
Shichino, Shigeyuki
Ueha, Satoshi
Nakajima, Takuya
Matsushima, Kouji
Wada, Takashi
description Methicillin-resistant Staphylococcus aureus (MRSA) causes severe infectious diseases and can be life-threatening in healthcare-settings. MRSA is classified into health-care associated (HA)-MRSA strains and community acquired (CA)-MRSA strains based on genotype and phenotype. CA-MRSA has been reported to show the lower minimal inhibitory concentration (MIC) of some antibiotics as compared to HA-MRSA. Recently, the prevalence of CA-MRSA has been increased in worldwide. CA-MRSA is isolated not only from the healthy individuals in a community but also from the patients in healthcare settings. However, the changing trend in frequency of HA-MRSA and CA-MRSA in the hospital setting is not clear. Therefore, we analyzed the trend of MIC to speculate the frequency of HA-MRSA and CA-MRSA in the facility. Moreover, gene mutations were evaluated on resistant gene loci with next generation sequencer. The frequency of strains with low MIC of beta-lactam antibiotics was gradually increased in isolated MRSA strains from the hospitalized patients. Whole genome analysis revealed the frequency of gene mutation was also decreased in some resistant loci, such as blaZ and blaR1. These findings highlight the changing trend of MRSA strains isolated from hospitalized patients.
doi_str_mv 10.1016/j.jiac.2020.01.016
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subjects Anti-Bacterial Agents - pharmacology
Bacterial Proteins - genetics
beta-Lactamases - genetics
beta-Lactams - pharmacology
CA-MRSA
Community-Acquired Infections - diagnosis
Community-Acquired Infections - microbiology
Cross Infection - diagnosis
Cross Infection - microbiology
DNA, Bacterial
Drug Resistance, Multiple, Bacterial - genetics
Female
Genotype
Humans
Japan
Male
Methicillin-Resistant Staphylococcus aureus - isolation & purification
Microbial Sensitivity Tests - trends
Middle Aged
MRSA
Mutation
Prevalence
Protein Structure, Tertiary - genetics
Staphylococcal Infections - diagnosis
Whole Genome Sequencing
title The increased frequency of methicillin-resistant Staphylococcus aureus with low MIC of beta-lactam antibiotics isolated from hospitalized patients
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