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multi-drug resistant bacteria

Elisa Boanini, Paola Torricelli, Francesca Bonvicini, Maria Cristina Cassani, Milena Fini, Giovanna Angela Gentilomi, Adriana Bigi
The development of new biomaterials able to favor bone formation and to inhibit bone abnormal resorption is mandatory to face the increasing number of age-related musculo-skeletal disorders. Moreover, the increasing antibiotic resistance of clinically important bacteria, which is among the main causes of implant failure, requires new antimicrobial systems. In this study, we prepared multifunctional materials consisting of hydroxyapatite-zoledronate composite crystals decorated with Ag Nanoparticles (AgNPs)...
February 15, 2018: European Journal of Pharmaceutics and Biopharmaceutics
Richa Singh, Jeet Vora, Shradhda B Nadhe, Sweety A Wadhwani, Utkarsha U Shedbalkar, Balu A Chopade
Acinetobacter baumannii has emerged as one of the major nosocomial pathogens implicated in variety of severe infections and mortality. It is rapidly developing multi-drug resistance and also possesses surface colonization ability, which make it most difficult to treat through traditional antibiotics. This is an extensive study to describe the antibacterial activity of bacteriagenic silver nanoparticles (AgNPs) against A. baumannii AIIMS 7 in planktonic and biofilm mode. Minimum inhibitory concentration of antibiotics were in the range of 1 to 4096 μg/ml whereas AgNPs inhibited planktonic bacteria at concentration of 16 μg/ml...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Prasannavenkatesh Durai, Yeongjoon Lee, Jieun Kim, Dasom Jeon, Yangmee Kim
Papiliocin, isolated from the swallowtail butterfly (Papilio xuthus), is an antimicrobial peptide with high selectivity against Gram-negative bacteria.We previously showed that the N-terminal helix of papiliocin (PapN) plays a key role in the antibacterial and anti-inflammatory activityof papiliocin. In this study, we measured the selectivity of PapN against multi-drug resistant Gram-negative bacteria,as well as its anti-inflammatory activity. Interactions between Trp2 of PapN and lipopolysaccharide (LPS) which is a major component of the outer membrane of Gram-negative bacteria were studied using the Trp fluorescence blue shift and quenching in LPS micelles...
February 13, 2018: Journal of Microbiology and Biotechnology
Y Zhang, S J Deng, Z Q Wang, J W Ding, X G Sun
Objective: To analyze the etiology and drug sensitivity of lacrimal canaliculitis. Methods: Retrospective study of case series. The general information, culture results and drug sensitivity results of 52 patients (including 10 males and 42 females with an average age of 60.3 years) clinically diagnosed with lacrimal canaliculitis during 2011 and 2016 at Beijing Tongren Hospital of Capital Medical University have been analyzed. The enumeration data have been tested with Chi-square method. Results: The positive rate of bacterial culture was 78...
February 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
Magdalena Wypij, Magdalena Świecimska, Joanna Czarnecka, Hanna Dahm, Mahendra Rai, Patrycja Golinska
AIMS: Presently, the effective antimicrobial agents have been limited by emergence of microbial strains with multi-drug resistance and biofilm formation potential. In the present study, we report remarkable antimicrobial activity of silver nanoparticles (AgNPs) synthesized from Streptomyces calidiresistens IF11 and IF17 strains, including inhibition of biofilm formation and synergistic effect of AgNPs and antibiotics against selected bacteria and yeasts. Cytotoxic effect of AgNPs on mammalian cell lines was also evaluated...
February 10, 2018: Journal of Applied Microbiology
Xin-Lei Gao, Ming-Fei Shao, Qing Wang, Li-Tao Wang, Wen-Yan Fang, Feng Ouyang, Ji Li
Clinically relevant antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in bioaerosols have become a greater threat to public health. However, few reports have shown that ARB and ARGs were found in the atmosphere. High-throughput sequencing applied to environmental sciences has enhanced the exploration of microbial populations in atmospheric samples. Thus, five nosocomial bioaerosols were collected, and the dominant microbial and pathogenic microorganisms were identified by high-throughput sequencing in this study...
February 2, 2018: Journal of Hazardous Materials
Katharina L van Santen, Jonathan R Edwards, Amy K Webb, Lori A Pollack, Erin O'Leary, Melinda M Neuhauser, Arjun Srinivasan, Daniel A Pollock
Background: To provide a standardized, risk-adjusted method for summarizing antibiotic use (AU) and to enable hospitals to track their AU over time and compare their AU data to national benchmarks, CDC developed a new metric, the Standardized Antimicrobial Administration Ratio (SAAR). Methods: Hospitals reporting to the National Healthcare Safety Network (NHSN) AU Option collect and submit aggregated AU data electronically as antimicrobial days of therapy per patient days present...
February 2, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
Muthupandian Saravanan, Sisir Kumar Barik, Davoodbasha MubarakAli, Periyakaruppan Prakash, Arivalagan Pugazhendhi
The present study is focused on the biological synthesis of silver nanoparticles (AgNPs) from the Bacillus brevis (NCIM 2533) was investigated. The synthesized AgNPs were characterized by various spectroscopic and microscopic techniques and confirmed the AgNPs having the surface Plasmon resonance peak at 420 nm and in the size range of 41-68 nm with spherical in shape by AFM and SEM analysis. It was confirmed and ascertained the presence of bioactive compounds in the AgNPs using TLC and FTIR. The In-vitro antibacterial activity of AgNPs showaed potential antibacterial property against multi-drug resistant pathogens such as Salmonella typhi and Staphylococcus aureus...
January 30, 2018: Microbial Pathogenesis
Sebastian Franco-Ulloa, Giuseppina La Sala, Gian Pietro Miscione, Marco De Vivo
DNA gyrases are enzymes that control the topology of DNA in bacteria cells. This is a vital function for bacteria. For this reason, DNA gyrases are targeted by widely used antibiotics such as quinolones. Recently, structural and biochemical investigations identified a new class of DNA gyrase inhibitors called NBTIs (i.e., novel bacterial topoisomerase inhibitors). NBTIs are particularly promising because they are active against multi-drug resistant bacteria, an alarming clinical issue. Structural data recently demonstrated that these NBTIs bind tightly to a newly identified pocket at the dimer interface of the DNA-protein complex...
February 3, 2018: International Journal of Molecular Sciences
Tony Velkov, Alejandra Gallardo-Godoy, James D Swarbrick, Mark A T Blaskovich, Alysha G Elliott, Meiling Han, Philip E Thompson, Kade D Roberts, Johnny X Huang, Bernd Becker, Mark S Butler, Lawrence H Lash, Sónia Troeira Henriques, Roger L Nation, Sivashangarie Sivanesan, Marc-Antoine Sani, Frances Separovic, Haydyn Mertens, Dieter Bulach, Torsten Seemann, Jeremy Owen, Jian Li, Matthew A Cooper
Resistance to the last-resort antibiotic colistin is now widespread and new therapeutics are urgently required. We report the first in toto chemical synthesis and pre-clinical evaluation of octapeptins, a class of lipopeptides structurally related to colistin. The octapeptin biosynthetic cluster consisted of three non-ribosomal peptide synthetases (OctA, OctB, and OctC) that produced an amphiphilic antibiotic, octapeptin C4, which was shown to bind to and depolarize membranes. While active against multi-drug resistant (MDR) strains in vitro, octapeptin C4 displayed poor in vivo efficacy, most likely due to high plasma protein binding...
January 23, 2018: Cell Chemical Biology
Jafar Hasan, Shubham Jain, Rinsha Padmarajan, Swathi Purighalla, Vasan K Sambandamurthy, Kaushik Chatterjee
Toward minimizing bacterial colonization of surfaces, we present a one-step etching technique that renders aluminum alloys with micro- and nano-scale roughness. Such a multi-scale surface topography exhibited enhanced antibacterial effect against a wide range of pathogens. Multi-scale topography of commercially grade pure aluminum killed 97% of Escherichia coli and 28% of Staphylococcus aureus cells in comparison to 7% and 3%, respectively, on the smooth surfaces. Multi-scale topography on Al 5052 surface was shown to kill 94% of adhered E...
February 15, 2018: Materials & Design
Saima Ali, Muhammad Rashid Khan, Irfanullah, Moniba Sajid, Zartash Zahra
BACKGROUND: Parrotiopsis jacquemontiana (Decne) Rehder. is locally used for skin infections and in wound healing. In this study we have evaluated methanol extract of its leaves and derived fractions against the clinical multi-drug resistant bacterial strains. METHODS: P. jacquemontiana leaves powder extracted with 95% methanol (PJM) and fractionated in escalating polarity of solvents; n-hexane (PJH), chloroform (PJC), ethyl acetate (PJE), n-butanol (PJB) and the remaining as aqueous fraction (PJA)...
January 31, 2018: BMC Complementary and Alternative Medicine
Elwira Sieniawska, Rafal Sawicki, Joanna Golus, Marta Swatko-Ossor, Grazyna Ginalska, Krystyna Skalicka-Wozniak
The most commonly used plant source of β-elemene is Curcuma wenyujin Y. H. Chen & C. Ling (syn. of Curcuma aromatic Salisb.) with its content in supercritical CO₂ extract up to 27.83%. However, the other rich source of this compound is Nigella damascena L. essential oil, in which β-elemene accounts for 47%. In this work, the effective protocol for preparative isolation of β-elemene from a new source-N. damascena essential oil-using high performance counter-current chromatography HPCCC was elaborated...
January 28, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Nicholas M Maurice, Brahmchetna Bedi, Ruxana T Sadikot
Pseudomonas aeruginosa is a major health challenge that causes recalcitrant multi-drug resistant infections, especially in immunocompromised and hospitalized patients. P. aeruginosa is an important cause of nosocomial and ventilator-associated pneumonia characterized by high prevalence and fatality rates. P. aeruginosa also causes chronic lung infections in individuals with cystic fibrosis (CF). Multi-drug and totally drug resistant strains of P. aeruginosa are increasing threats that contribute to high mortality in these patients...
January 26, 2018: American Journal of Respiratory Cell and Molecular Biology
John Gammon, Julian Hunt
Multi-resistant bacteria pose an increasing and significant challenge to public health. Isolation precautions in patients with multi-drug-resistant bacteria and other communicable infectious agents can be associated with adverse effects. Although few would dispute the need for such practices in preventing the spread of transmissible infections, patients' perspectives of isolation suggest that the imposed environment creates barriers to their physical, social and emotional needs. This article reviews the literature to uncover any reliable evidence supporting the assertion that the experience of isolation in healthcare settings impacts adversely on patient wellbeing...
January 25, 2018: British Journal of Nursing: BJN
Mark Arnold Thomas Blaskovich, Karl A Hansford, Mark Stuart Butler, ZhiGuang Jia, Alan Edward Mark, Matthew A Cooper
Glycopeptide antibiotics (GPA) are a key weapon in the fight against drug resistant bacteria, with vancomycin still a mainstream therapy against serious Gram-positive infections more than 50 years after it was first introduced. New, more potent semisynthetic derivatives that have entered the clinic, such as dalbavancin and oritavancin, have superior pharmacokinetic and target engagement profiles that enable successful treatment of vancomycin-resistant infections. In the face of resistance development, with multi-drug resistant (MDR) S...
January 24, 2018: ACS Infectious Diseases
Zumrut Sahbudak Bal, Fulya Kamit Can, Pinar Yazici, Ayse Berna Anil, Muhterem Duyu, Dilek Yilmaz Ciftdogan, Ozkalay Nisel Yilmaz, Feriha Cilli, Bulent Karapinar
Colistin, an old cationic polypeptide antibiotic, have been reused due to rising incidence of infections caused by multi-drug resistant (MDR) Gram-negative microorganisms and the lack of new antibiotics. Therefore, we evaluated safety and efficacy of colistin in treatment of these infections. This study included 104 critically ill children with a median age of 55,9 months between January 2011 and January 2016. Nephrotoxicity occurred in 11 (10.5%) patients. Nephrotoxicity occurred between the third and seventh day of treatment in 63% of colistin induced nephrotoxicity episodes...
January 17, 2018: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Marcin Ciszewski, Tomasz Czekaj, Eligia M Szewczyk
Unreasonable antibacterial therapy is suspected to be the main reason of emergence of multi-resistant bacteria. The connection between seasonal variability of antibiotic use and reasonable antibacterial therapy has been described. We examined the issue basing on the data obtained from the primary care system in Szczecin (Poland) in order to verify the situation in this region of Central Europe. Increase in antibiotic consumption in a viral infection season was proved to be statistically significant. Statistically significant differences in various drug forms dispensation were also observed...
March 30, 2017: Polish Journal of Microbiology
Atia-Tul-Wahab, Mahwish Siddiqui, Iman Ibrahim, Arifa Hussain, El Hassan Ajandouz, Akram Hijazi, Elias Baydoun, M Iqbal Choudhary
Staphylococcus aureus is one of the most infectious agents among staphylococcal bacteria. Currently many strains of S. aureus have developed resistance against available antibiotics. Therefore, the treatment of infections caused by them is a major challenge. During current study, desogestrel (1), a contraceptive drug, was found to be a potent growth inhibitor of drug resistant strains of S. aureus. Therefore, in search of new and effective agents against multi-drug resistant S. aureus strains, whole-cell bio-catalytic conversion of desogestrel (1) by Cunninghamella blakesleeana ATCC 8688A at pH 7...
January 2, 2018: Bioorganic Chemistry
Qian Liu, Xueqin Ni, Qiang Wang, Zhirong Peng, Lili Niu, Meiling Xie, Yicen Lin, Yi Zhou, Hao Sun, Kangcheng Pan, Bo Jing, Dong Zeng
The present study aimed to isolate an optimal lactic acid bacterial strain from the feces of healthy giant pandas. The strain exhibited good stability at low pH and high bile salt concentrations, activity against pathogens relevant to pandas, and antibiotic susceptibility. In the current study, 25 isolates were obtained from de Man, Rogosa, and Sharpe agar. Two (E21 and G83) and eight (E1, E2, E16, E18, E21, E69, E70, and G83) isolates demonstrated good performance at pH 2.0 and bile 2% (w/v), respectively...
January 20, 2018: Probiotics and Antimicrobial Proteins
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