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Poor efficacy of the combination of clarithromycin, amikacin, and cefoxitin against Mycobacterium abscessus in the hollow fiber infection model.
Ann Clin Microbiol Antimicrob
January 2025
Laboratoire des Mycobactéries, Institut des Agents Infectieux, Laboratoire de Biologie Médicale Multi-Site, Hôpital de la Croix Rousse, Hospices Civils de Lyon, Lyon, France.
Background: Mycobacterium abscessus (MABS) causes difficult-to-treat pulmonary and extra-pulmonary infections. A combination therapy comprising amikacin, cefoxitin, and a macrolide agent is recommended, but its antimicrobial activity and clinical efficacy is uncertain. Inducible resistance to macrolides (macrolides-iR) has been associated with poor clinical response in pulmonary infections, whilst for extra-pulmonary infections data are scarce.
View Article and Find Full Text PDFMaxillary MRSA osteomyelitis in a paediatric patient: non-surgical management.
BMJ Case Rep
January 2025
Dentistry, All India Institute of Medical Sciences Mangalagiri, Mangalagiri, Andhra Pradesh, India
Methicillin-resistant (MRSA) osteomyelitis of the maxilla is a rare condition in paediatric patients, with limited evidence available for optimal treatment protocols. We present the case of a paediatric patient in the early childhood age group with post-traumatic maxillary osteomyelitis caused by MRSA. The child developed facial swelling following trauma, and imaging revealed maxillary sinus wall thickening and bone erosions.
View Article and Find Full Text PDFNebulized aminoglycosides for ventilator-associated pneumonia: Methodological considerations and lessons from experimental studies.
J Intensive Med
January 2025
Department of Pneumology, Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona - SGR 911- Ciber de Enfermedades Respiratorias (Ciberes), Barcelona, Spain.
Aminoglycosides are concentration-dependent antibiotics exerting a bactericidal effect when concentrations at the site of infection are equal to or greater than 5 times the minimum inhibitory concentrations (MIC). When administered intravenously, they exhibit poor lung penetration and high systemic renal and ototoxicity, imposing to restrict their administration to 5 days. Experimental studies conducted in anesthetized and mechanically ventilated sheep and pigs provide evidence that high doses of nebulized aminoglycosides induce a rapid and potent bacterial killing in the infected lung parenchyma.
View Article and Find Full Text PDFCorrelation between rrs gene mutations and amikacin resistance in Mycobacterium abscessus: implications for fitness cost and clinical prevalence.
J Antimicrob Chemother
January 2025
Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, China.
Objectives: Amikacin is crucial for treating Mycobacterium abscessus (Mab) infections, with resistance primarily attributed to rrs gene mutations. The correlation between specific mutations and amikacin susceptibility, along with the associated fitness cost, requires further investigation.
Methods: We isolated spontaneous amikacin-resistant mutants in vitro and identified their mutation sites in the rrs gene via Sanger sequencing, which were then compared with existing reports.
Isolation, Identification, and Antimicrobial Susceptibilities of Bacteria from the Conjunctival Sacs of Dogs with Bacterial Conjunctivitis in Different Regions of Wuhan, China.
Vet Sci
January 2025
Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
In order to investigate the bacterial species present in the conjunctival sacs of dogs with bacterial conjunctivitis in Wuhan (Hongshan District, Wuchang District, Jiangxia District, and Huangpi District) and their resistance to aminoglycoside antibiotics, samples of conjunctival sac secretions were collected from 56 dogs with bacterial conjunctivitis in various regions of Wuhan. Drug susceptibility testing for aminoglycoside antibiotics was performed on the most commonly isolated gram-positive and gram-negative bacteria. The expression of two aminoglycoside modifying enzyme genes, and , and three 16S rRNA methyltransferase genes, , and , were analyzed by PCR.
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