Article
Biotechnology & Applied Microbiology
Katharina Juraschek, Janina Malekzadah, Burkhard Malorny, Annemarie Kaesbohrer, Stefan Schwarz, Diana Meemken, Jens Andre Hammerl
Summary: This study investigated the occurrence and genetic basis of the fluoroquinolone resistance enhancing determinant qnrB in ESBL-/non-ESBL-producing E. coli. The qnrB-carrying E. coli were found to be highly heterogenic in their multilocus sequence types (STs) and their phenotypic resistance profiles.
Article
Infectious Diseases
Katharina Juraschek, Annemarie Kaesbohrer, Burkhard Malorny, Stefan Schwarz, Diana Meemken, Jens Andre Hammerl
Summary: Plasmids are mobile genetic elements that contribute to the dissemination of resistance determinants, including plasmid-mediated quinolone resistances (PMQRs) like the qnrS1 gene. This study investigated 2799 commensal Escherichia coli isolates from the pork and beef production chain in Germany, revealing the prevalence of qnrS1-carrying IncX plasmids in diverse E. coli strains.
Article
Microbiology
Steven Dunn, Laura Carrilero, Michael Brockhurst, Alan McNally
Summary: The study found that different E. coli strains vary in their ability to acquire and maintain MDR plasmids, with highly strain-specific transcriptional responses observed following plasmid acquisition. However, the subtle transcriptional responses consistent across all strains suggest that fitness costs arising from transcriptional disruption are unlikely to act as a barrier to dissemination of this MDR plasmid in E. coli.
Article
Microbiology
Jing Wang, Meng-Jun Lu, Zhen-Yu Wang, Yue Jiang, Han Wu, Zhi-Ming Pan, Xinan Jiao
Summary: This study investigated the prevalence and characterization of tet(X4) in Escherichia coli isolates from a pig farm in Shanghai, China, and revealed the dissemination mechanism of tet(X4) in this swine farm. The results showed clonal transmission of tet(X4)-positive E. coli ST761 in this pig farm.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Infectious Diseases
Yujie Hu, Seamus Fanning, Scott Nguyen, Wei Wang, Chang Liu, Xinnan Cui, Yinping Dong, Xin Gan, Jin Xu, Fengqin Li
Summary: CFSA629, a MDR S. Typhimurium ST34 isolate from China, carries a novel mcr-1.19 variant on an IncHI2 plasmid, highlighting the importance of surveillance to prevent the spread of mcr genes among foodborne Salmonella. Improved surveillance is crucial in controlling the dissemination of mcr genes worldwide.
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
(2021)
Article
Infectious Diseases
Joaquim Vines, Anna Cusco, Sebastian Napp, Julio Alvarez, Jose Luis Saez-Llorente, Montserrat Rosas-Rodoreda, Olga Francino, Lourdes Migura-Garcia
Summary: Colistin, once discontinued in human medicine due to toxicity, is now being used as a last-resort antibiotic for treating hospital infections caused by multi-drug resistant Enterobacteriaceae. A study found that colistin-resistant E. coli isolates carrying mcr-1 were transmitted from livestock to a farmer through horizontal gene transfer. Additionally, virulence factors including Shiga toxin E. coli were detected, emphasizing the role of livestock as a reservoir for potential zoonotic pathogens.
Article
Microbiology
Jennifer Moussa, Edmond Abboud, Sima Tokajian
Summary: The prevalence of antibiotic-resistant bacteria in surface water in Lebanon is a growing concern. The dissemination of resistance determinants is exacerbated with the ongoing intensified population mobility in Lebanon and the widespread lack of wastewater treatment. Further studies are needed to address this issue and prevent potential public health risks.
FEMS MICROBIOLOGY ECOLOGY
(2021)
Article
Environmental Sciences
Murugadas Vaiyapuri, Anna SherinPulithara Sebastian, Iris George, Sandhya Soolamkandath Variem, Radhakrishnan Nair Vasudevan, Joshy Chalil George, Madhusudana Rao Badireddy, Visnuvinayagam Sivam, Shaheer Peeralil, Devi Sanjeev, Muthulakshmi Thandapani, Sheela Albert Moses, Ravishankar Chandragiri Nagarajarao, Mukteswar Prasad Mothadaka
Summary: The study assessed the burden of antimicrobial resistance (AMR) in Escherichia coli in Vembanad Lake, Kerala, India. The findings revealed high prevalence of E. coli with resistance to multiple antibiotics, presence of genetically diverse ESBL types, and potential for resistance transmission through plasmids. This highlights the health hazards posed by genetically diverse ESBL E. coli in the lake and the need for pragmatic control measures.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Jianxiu Hao, Jun Ren, Hongbing Fang, Ling Tao
Summary: The study found that the average contents of chromium and cadmium in the sediments exceeded the average value in soil, the world average concentration in the shales, and the first-level standard of soil environmental quality in China, making them the main risk metals. Vegetation coverage was identified as the largest influencing factor for the spatial distribution of heavy metals in the sediment, followed by per capita income. The Wuhai section was mainly polluted by cadmium and lead, while the Baotou section was mainly polluted by chromium.
Article
Genetics & Heredity
Grace A. Blackwell, Emma L. Doughty, Robert A. Moran
Summary: Conjugative, broad host-range plasmids of the L/M complex, associated with antibiotic resistance, have been found in Gram-negative bacteria causing human infections and persisting in hospital environments. Accurate typing of these plasmids is crucial for tracing their clinical and global dissemination in epidemiological studies. The complex has been divided into L, M1, and M2 subtypes, but further investigation reveals additional diversity within the group, with distinct lineages evolving through genetic recombination and acquisition of antibiotic resistance genes.
Article
Public, Environmental & Occupational Health
L. Salazar-Ospina, J. M. Vanegas, J. N. Jimenez
Summary: The study found high intermittent colonization of beta-lactam-resistant Gram-negative bacilli in haemodialysis patients, with diverse clones identified. Fluoroquinolone use and chronic obstructive lung disease were associated with colonization by ESBL-producing Gram-negative bacilli.
JOURNAL OF HOSPITAL INFECTION
(2021)
Article
Genetics & Heredity
Carol H. Pong, Ruth M. Hall
Summary: The sequence of the conjugative plasmid pSRC22-2, isolated from a multiply antibiotic resistant Salmonella enterica serovar Ohio isolate SRC22 cultured from swine in 1999, was determined. Plasmid pSRC22-2 has a copy number of approximately 40 and high frequency transfer of tetracycline resistance. It belongs to the X1 alpha subgroup and shares its backbone with other X1 alpha plasmids, including IS elements and a novel miniature inverted repeat transposable element (MITE).
Article
Environmental Sciences
Zirong Xiao, Liping Yu, Jia Li, Wen Zhu, Yuxiao Li, Yanni Li, Changlin Zhan, Hongxia Liu, Jiaquan Zhang, Yanan Wang, Shan Liu
Summary: This study examines the distribution characteristics and potential sources of black carbon (BC) in surface sediments from three distinct development areas. Human activities significantly influenced the distribution and sources of BC in sediments from different types of lakes in areas with diverse developmental characteristics.
JOURNAL OF SOILS AND SEDIMENTS
(2023)