Identification and characterization of novel isothiazolones with potent bactericidal activity against multi-drug resistant Acinetobacter baumannii clinical isolates

2019 ◽  
Vol 53 (4) ◽  
pp. 474-482 ◽  
Author(s):  
Breanna L. Luna ◽  
Javier A. Garcia ◽  
Min Huang ◽  
Peter J. Ewing ◽  
Sonya C. Valentine ◽  
...  
2020 ◽  
Vol 13 (2) ◽  
pp. 327
Author(s):  
R Bawazeer ◽  
M Algoribi ◽  
T Abujamel ◽  
L Okdah ◽  
M Alzayer ◽  
...  

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Amit Gaurav ◽  
Varsha Gupta ◽  
Sandeep K. Shrivastava ◽  
Ranjana Pathania

AbstractThe increasing prevalence of antimicrobial resistance has become a global health problem. Acinetobacter baumannii is an important nosocomial pathogen due to its capacity to persist in the hospital environment. It has a high mortality rate and few treatment options. Antibiotic combinations can help to fight multi-drug resistant (MDR) bacterial infections, but they are rarely used in the clinics and mostly unexplored. The interaction between bacteriostatic and bactericidal antibiotics are mostly reported as antagonism based on the results obtained in the susceptible model laboratory strain Escherichia coli. However, in the present study, we report a synergistic interaction between nalidixic acid and tetracycline against clinical multi-drug resistant A. baumannii and E. coli. Here we provide mechanistic insight into this dichotomy. The synergistic combination was studied by checkerboard assay and time-kill curve analysis. We also elucidate the mechanism behind this synergy using several techniques such as fluorescence spectroscopy, flow cytometry, fluorescence microscopy, morphometric analysis, and real-time polymerase chain reaction. Nalidixic acid and tetracycline combination displayed synergy against most of the MDR clinical isolates of A. baumannii and E. coli but not against susceptible isolates. Finally, we demonstrate that this combination is also effective in vivo in an A. baumannii/Caenorhabditis elegans infection model (p < 0.001)


2020 ◽  
Vol 9 (40) ◽  
Author(s):  
Peechanika Chopjitt ◽  
Thidathip Wongsurawat ◽  
Piroon Jenjaroenpun ◽  
Parichart Boueroy ◽  
Rujirat Hatrongjit ◽  
...  

ABSTRACT Here, we report the complete genome sequences of four clinical isolates of extensively drug-resistant Acinetobacter baumannii (XDRAB), isolated in Thailand. These results revealed multiple antimicrobial-resistant genes, each involving two sequence type 16 (ST16) isolates, ST2, and a novel sequence type isolate, ST1479.


2004 ◽  
Vol 48 (3) ◽  
pp. 1055-1057 ◽  
Author(s):  
Rose Jung ◽  
Maroof Husain ◽  
Michael K. Choi ◽  
Douglas N. Fish

ABSTRACT The bactericidal activity of moxifloxacin alone and in combination with cefepime or piperacillin-tazobactam against clinical isolates of Klebsiella pneumoniae, Enterobacter cloacae, and Acinetobacter baumannii was evaluated by using time-kill methods and antimicrobial concentrations of one-half and one times the MIC. Synergy was observed in 58 to 88% of the strains and resulted in bactericidal activity against 60 to 100% of the strains. Combinations including moxifloxacin demonstrated enhanced bactericidal activity compared with that of either agent tested alone.


2005 ◽  
Vol 43 (9) ◽  
pp. 4382-4390 ◽  
Author(s):  
S. G. Bartual ◽  
H. Seifert ◽  
C. Hippler ◽  
M. A. D. Luzon ◽  
H. Wisplinghoff ◽  
...  

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