Article
Immunology
Mariana Castanheira, Rodrigo E. Mendes, Ana C. Gales
Summary: The Acinetobacter baumannii-calcoaceticus complex (ABC) is a significant group of organisms causing human infections worldwide, with a small number of clones responsible for increased infections and resistance to antimicrobial agents. This article discusses the current epidemiology and resistance mechanisms in ABC. A. baumannii-calcoaceticus is the most common species in the Acinetobacter genus and is responsible for a large percentage of nosocomial infections, including bacteremia, pneumonia, and skin and urinary tract infections. Key clones of A. baumannii-calcoaceticus play a major role in the global dissemination of these organisms, and multidrug resistance is a common trait among these clones due to their remarkable adaptability. A. baumannii-calcoaceticus isolates can develop resistance through various mechanisms, such as horizontal gene transfer, natural transformation, acquisition of mutations, and mobilization of genetic elements.
CLINICAL INFECTIOUS DISEASES
(2023)
Article
Microbiology
Yi Huang, Md Roushan Ali, Wei Li, Wanying Wang, Yuanyuan Dai, Huaiwei Lu, Zhien He, Yujie Li, Baolin Sun
Summary: This study focused on Acinetobacter baumannii, a major health threat, and specifically investigated the ST369 strain prevalent in China. The researchers identified potential mutations that could impact bacterial virulence and resistance, providing a foundation for further research on clinical isolates harboring similar mutations.
Article
Microbiology
James A. Karlowsky, Meredith A. Hackel, Sarah M. McLeod, Alita A. Miller
Summary: Sulbactam-durlobactam demonstrated potent antibacterial activity against geographically diverse clinical isolates of Acinetobacter baumannii-calcoaceticus complex (ABC), including carbapenem-non-susceptible and multidrug-resistant (MDR) isolates.
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
(2022)
Article
Microbiology
Katerina Tsilipounidaki, Christos-George Gkountinoudis, Zoi Florou, George C. Fthenakis, Vivi Miriagou, Efthymia Petinaki
Summary: The present study reports the detection and molecular characterization of nine blaNDM-1-positive Acinetobacter baumannii isolates isolated from patients in a tertiary care hospital in Central Greece. The isolates were characterized using whole genome sequencing, revealing their multilocus sequencing typing (MLST), bla(NDM-1) environment, resistome, and virulence genes. The results showed that the isolates belonged to four different clones. This is the first report of the emergence of polyclonal bla(NDM-1)-positive Acinetobacter baumannii in Greece. The findings highlight the need for diligent surveillance protocols to limit the horizontal transfer of the bla(NDM-1) gene.
Review
Ophthalmology
Kenneth K. H. Lai, Sarah Wang, Andrew K. T. Kuk, Alan Tsang, Jacqueline H. C. Tai, Callie K. L. Ko
Summary: Acinetobacter baumannii-calcoaceticus complex is a common cause of hospital-acquired infections, including orbital cellulitis. This study presents a case of orbital cellulitis caused by the A. baumannii-calcoaceticus complex, which was successfully treated with antibiotics.
OCULAR IMMUNOLOGY AND INFLAMMATION
(2023)
Article
Infectious Diseases
Min-Ge Wang, Chang Fang, Kai-Di Liu, Lin-Lin Wang, Ruan-Yang Sun, Rong-Min Zhang, Liang-Xing Fang, Jian Sun, Ya-Hong Liu, Xiao-Ping Liao
Summary: This study investigated the transmission and molecular characteristics of bla(NDM)-producing Escherichia coli between companion animals and their healthcare providers at veterinary clinics in Guangzhou, China. The study revealed the clonal spread of bla(NDM)-positive E. coli isolates between these two groups.
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
(2022)
Review
Infectious Diseases
Carmi Bartal, Kenneth V. Rolston, Lior Nesher
Summary: Carbapenem-resistant Acinetobacter baumannii (CRAB) predominantly causes colonization and infection in hospitalized patients. Distinguishing between the two is challenging. Treatment should be based on clear signs of infection and consideration of the presence of indwelling medical devices. Current treatment options are limited and combination therapy appears to be the best option.
INFECTIOUS DISEASES AND THERAPY
(2022)
Article
Public, Environmental & Occupational Health
Meijie Jiang, Xia Chen, Shuang Liu, Zhijun Zhang, Ning Li, Chao Dong, Ling Zhang, Haiyan Wu, Shuping Zhao
Summary: The study found that there was no significant change in the antibiotic-resistant and carbapenemase-resistant genes of 295 MDR A. baumannii isolates in the hospital over the past 12 years, and most isolates had a relatively close genetic relationship. The detection rates of carbapenemase-resistant genes bla(OXA-23), bla(TEM-1), and bla(OXA-66) were high, and the most common sequence types were ST208 and ST369.
FRONTIERS IN PUBLIC HEALTH
(2021)
Article
Infectious Diseases
Samira M. Hamed, Amira F. A. Hussein, Mohamed H. Al-Agamy, Hesham H. Radwan, Mai M. Zafer
Summary: This study investigated a novel composite transposon Tn7382 harboring resistance genes blaNDM-1 and aphA6 in Acinetobacter baumannii using bioinformatic tools and an in silico approach. The potential mobility of Tn7382 was inferred through comparative genomic analysis, and experimental validation is still required.
JOURNAL OF GLOBAL ANTIMICROBIAL RESISTANCE
(2022)
Article
Microbiology
Renru Han, Li Ding, Yang Yang, Yan Guo, Dandan Yin, Shi Wu, Peiyuan Zhi, Demei Zhu, Qingmei Liu, Xiaojuan Tan, Yuanju Zhu, Jay Zhang, Li Li, Fupin Hu
Summary: This study evaluated the in vitro activity of KBP-7072 against clinical A. baumannii isolates collected from China. The results showed that KBP-7072 had inhibitory effects on all isolates, including carbapenem-resistant and other multidrug resistant strains, and its activity was superior to other expanded spectrum tetracyclines. Therefore, KBP-7072 may be a potential alternative for the treatment of carbapenem-resistant A. baumannii infections.
MICROBIOLOGY SPECTRUM
(2022)
Article
Multidisciplinary Sciences
Lucie Semenec, Amy K. K. Cain, Catherine J. J. Dawson, Qi Liu, Hue Dinh, Hannah Lott, Anahit Penesyan, Ram Maharjan, Francesca L. L. Short, Karl A. A. Hassan, Ian T. T. Paulsen
Summary: This study characterizes the genomes of A. baumannii and K. pneumoniae strains co-isolated from a single human lung infection, and investigates their interactions through various assays. The findings shed light on their effects on antimicrobial resistance and virulence during co-infection.
NATURE COMMUNICATIONS
(2023)
Article
Biotechnology & Applied Microbiology
Xingchen Bian, Xiaofen Liu, Xuefei Zhang, Xin Li, Jing Zhang, Huajun Zheng, Sichao Song, Xiang Li, Meiqing Feng
Summary: Acinetobacter baumannii is a common nosocomial pathogen with high carbapenem resistance rates in Chinese hospitals. The predominant clone carrying bla(OXA-23) gene is CC208. Multi-drug resistant A. baumannii isolates exhibit various virulence factors related to bacterial motility and polysaccharide biosynthesis.
Review
Microbiology
Ilaria Cavallo, Alessandra Oliva, Rebecca Pages, Francesca Sivori, Mauro Truglio, Giorgia Fabrizio, Martina Pasqua, Fulvia Pimpinelli, Enea Gino Di Domenico
Summary: Acinetobacter baumannii is a major pathogen in vulnerable and critically ill patients, causing various infections with high mortality rates. Carbapenems have been the first choice for treatment, but widespread prevalence of carbapenem-resistant A. baumannii has led to the use of colistin as the main therapeutic option. However, high clinical failure rates have been reported for colistin monotherapy. Additionally, A. baumannii forms biofilms on medical devices, posing a significant treatment challenge.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Infectious Diseases
Heriyannis Homenta, Julyadharma Julyadharma, Hani Susianti, Noorhamdani Noorhamdani, Dewi Santosaningsih
Summary: This study identified the clonal relatedness of carbapenem-resistant Acinetobacter baumannii-calcoaceticus complex isolates in two tertiary care hospitals in Indonesia. The CC1 clone of MLVA type (MT) 1, MT3, and MT4 CRAB-cc belonging to the sequence type (ST) 642 was found to be predominant. Further research is needed to investigate the clinical importance and distribution of ST642 in Indonesian hospitals for the development of prevention and control measures.
TROPICAL MEDICINE AND INFECTIOUS DISEASE
(2022)
Article
Infectious Diseases
Wenxin Chen, Zhihong Liu, Hongguang Lin, Jie Yang, Ting Liu, Jiaomei Zheng, Xueming Long, Zhiliang Sun, Jiyun Li, Xiaojun Chen
Summary: This study investigated the prevalence of bla(NDM-1) carrying Enterobacteriaceae on an intensive pig farm. The results showed the presence of four bla(NDM-1) positive and multidrug-resistant Providencia strains. The research suggests the need to focus on animal health and welfare in intensive farming to reduce antibiotic usage frequency.