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Tuesday, April 21, 2020

Efficacy of Newly Isolated and Highly Potent Bacteriophages in a Mouse Model of XDRAB Bacteremia.

Bacteremia can be caused by Acinetobacter baumannii with clinical manifestations ranging from transient bacteremia to septic shock. Extensively drug-resistant A. baumannii (XDRAB) strains producing the New Delhi metallo-ß-lactamase, which confers resistance to all ß-lactams including carbapenems, have emerged and infected patients suffer increased mortality, morbidity and length of hospitalization. The lack of new antimicrobials led to a renewed interest into phage therapy, the so-called forgotten cure. Accordingly, we tested new lytic bacteriophages in a Galleria mellonella and a mouse model of XDRAB-induced bacteremia.Galleria mellonella were challenged with 5.105 CFU of the XDRAB strain FER. Phages vB_AbaM_3054 and vB_AbaM_3090 were administrated…

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Tuesday, April 21, 2020

Design and Preclinical Development of a Phage Product for the Treatment of Antibiotic-Resistant Staphylococcus aureus Infections.

Bacteriophages, viruses that only kill specific bacteria, are receiving substantial attention as nontraditional antibacterial agents that may help alleviate the growing antibiotic resistance problem in medicine. We describe the design and preclinical development of AB-SA01, a fixed-composition bacteriophage product intended to treat Staphylococcus aureus infections. AB-SA01 contains three naturally occurring, obligately lytic myoviruses related to Staphylococcus phage K. AB-SA01 component phages have been sequenced and contain no identifiable bacterial virulence or antibiotic resistance genes. In vitro, AB-SA01 killed 94.5% of 401 clinical Staphylococcus aureus isolates, including methicillin-resistant and vancomycin-intermediate ones for a total of 95% of the 205 known multidrug-resistant…

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Tuesday, April 21, 2020

Complete genome sequence of a novel bacteriophage, PBKP05, infecting Klebsiella pneumoniae.

An increasing number of Klebsiella pneumoniae isolates have been found to be multi-drug resistant. A novel bacteriophage, PBKP05, which infects K. pneumoniae, was isolated and characterized. It has a linear double-stranded DNA genome of 30,240 base pairs in length. Its G+C content is 53%, and 47 putative open reading frames are functionally annotated. This phage can be a candidate material for phage therapy.

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Tuesday, April 21, 2020

Biomimetic hydroxyapatite nanocrystals are an active carrier for Salmonella bacteriophages.

The use of bacteriophages represents a valid alternative to conventional antimicrobial treatments, overcoming the widespread bacterial antibiotic resistance phenomenon. In this work, we evaluated whether biomimetic hydroxyapatite (HA) nanocrystals are able to enhance some properties of bacteriophages. The final goal of this study was to demonstrate that biomimetic HA nanocrystals can be used for bacteriophage delivery in the context of bacterial infections, and contribute – at the same time – to enhance some of the biological properties of the same bacteriophages such as stability, preservation, antimicrobial activity, and so on.Phage isolation and characterization were carried out by using Mitomycin C…

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