Category Archives: Antimicrobials

Research – New compound which kills antibiotic-resistant superbugs discovered

Science Daily

A new compound which visualises and kills antibiotic resistant superbugs has been discovered by scientists at the University of Sheffield and Rutherford Appleton Laboratory (RAL).

The team, led by Professor Jim Thomas, from the University of Sheffield’s Department of Chemistry, is testing new compounds developed by his PhD student Kirsty Smitten on antibiotic resistant gram-negative bacteria, including pathogenic E. coli.

Gram-negative bacteria strains can cause infections including pneumonia, urinary tract infections and bloodstream infections. They are difficult to treat as the cell wall of the bacteria prevents drugs from getting into the microbe.

Antimicrobial resistance is already responsible for 25,000 deaths in the EU each year, and unless this rapidly emerging threat is addressed, it’s estimated by 2050 more than 10 million people could die every year due to antibiotic resistant infections.

Doctors have not had a new treatment for gram-negative bacteria in the last 50 years, and no potential drugs have entered clinical trials since 2010.

The new drug compound has a range of exciting opportunities. As Professor Jim Thomas explains: “As the compound is luminescent it glows when exposed to light. This means the uptake and effect on bacteria can be followed by the advanced microscope techniques available at RAL.

Research – Relationship of Sanitizers, Disinfectants, and Cleaning Agents with Antimicrobial Resistance

Journal of Food Protection

ABSTRACT

Sanitizers, disinfectants, and cleaning agents are vital to food hygiene assurance and are a major public health protection measure. Limiting microbial antibiotic resistance is also a global public health priority. Although many factors contribute to the rise in antimicrobial resistance in bacteria infecting humans, antibiotic use in both human clinical settings and for food-producing animals are primary contributors. Some concerns have been raised about the possibility of coselection between food hygiene chemicals and reduced antimicrobial susceptibility. This article reviews available evidence from individual studies purporting to demonstrate a possible risk of antimicrobial resistance development, following biocide usage. Furthermore, the conclusions of several key expert reports and meta-analysis publications were assessed for supportive evidence of a relationship between biocide usage in food production and resistance development. Although many studies report on the isolation of antimicrobial-resistant bacterial strains in food, evidence is lacking on the attribution of this resistance to biocide usage. Also, although a theoretical risk of causality exists, many of the studies performed to demonstrate this are in vitro studies using laboratory-grown or -trained bacterial isolates, challenged with sublethal (below the recommended food industry) disinfectant or sanitizing agent concentrations. The proper use of, and adherence to biocide manufacturer’s instruction for use, and the avoidance of biocide active agent dilution (e.g., through biofilm presence) must be ensured in food production environments. It is recommended that in situ studies should be performed to further assess causality, ensured a clear differentiation between interpretation of stable antimicrobial resistance and phenotypic adaptation. Furthermore, authorization of new biocidal active substances should take a scientific and risk-based approach regarding the potential for driving microbial resistance.

HIGHLIGHTS
  • Sanitizers and disinfectants (biocides) are essential for food safety assurance.

  • Concerns have been raised about theoretical risk of biocide-induced antimicrobial resistance.

  • In vitro studies provide weak causal evidence to attribute antimicrobial resistance to biocide usage.

  • GMPs, proper biocide usage, and avoidance of biofilms mitigate risk of antimicrobial resistance.

Research – Relationship of Sanitizers, Disinfectants, and Cleaning Agents with Antimicrobial Resistance

Journal of Food Protection

Sanitizers, disinfectants, and cleaning agents are vital to food hygiene assurance and are a major public health protection measure. Limiting microbial antibiotic resistance is also a global public health priority. Although many factors contribute to the rise in antimicrobial resistance in bacteria infecting humans, antibiotic use in both human clinical settings and for food-producing animals are primary contributors. Some concerns have been raised about the possibility of coselection between food hygiene chemicals and reduced antimicrobial susceptibility. This article reviews available evidence from individual studies purporting to demonstrate a possible risk of antimicrobial resistance development, following biocide usage. Furthermore, the conclusions of several key expert reports and meta-analysis publications were assessed for supportive evidence of a relationship between biocide usage in food production and resistance development. Although many studies report on the isolation of antimicrobial-resistant bacterial strains in food, evidence is lacking on the attribution of this resistance to biocide usage. Also, although a theoretical risk of causality exists, many of the studies performed to demonstrate this are in vitro studies using laboratory-grown or -trained bacterial isolates, challenged with sublethal (below the recommended food industry) disinfectant or sanitizing agent concentrations. The proper use of, and adherence to biocide manufacturer’s instruction for use, and the avoidance of biocide active agent dilution (e.g., through biofilm presence) must be ensured in food production environments. It is recommended that in situ studies should be performed to further assess causality, ensured a clear differentiation between interpretation of stable antimicrobial resistance and phenotypic adaptation. Furthermore, authorization of new biocidal active substances should take a scientific and risk-based approach regarding the potential for driving microbial resistance.

HIGHLIGHTS
  • Sanitizers and disinfectants (biocides) are essential for food safety assurance.

  • Concerns have been raised about theoretical risk of biocide-induced antimicrobial resistance.

  • In vitro studies provide weak causal evidence to attribute antimicrobial resistance to biocide usage.

  • GMPs, proper biocide usage, and avoidance of biofilms mitigate risk of antimicrobial resistance.

Research – Chicken superbug CAN’T be treated with antibiotics: Warning as common bacteria found in half of supermarket poultry turns drug resistant

Daily Mail

campy2

Image CDC

  • Campylobacter is found at low levels on half of chickens sold by major stores 
  • The bug is responsible for an estimated 500,000 cases of illness in the UK
  • More than nine per cent of one strain is resistant to three types of antibiotic 
  • Farmer using antibiotics to treat animals have raised levels of resistance 

 

Research – Increased prevalence of Escherichia coli strains from food carrying blaNDM and mcr-1-bearing plasmids that structurally resemble those of clinical strains, China, 2015 to 2017

Eurosurveillance

Antimicrobial resistance poses an increasing risk to human and animal health worldwide. In particular, carbapenem resistance mediated by serine β-lactamases and metallo-β-lactamases (MBLs), such as the OXA enzymes produced by  and  carbapenemase (KPC-1) and New Delhi metallo-β-lactamase (NDM-1) produced by Enterobacteriaceae, is associated with a high mortality rate among hospitalised patients [1,2]. NDM-1, a type of Ambler class B metallo-β-lactamases (MBLs), exhibits high hydrolytic activity against almost all known β-lactam antimicrobials (except aztreonam), including the last-line carbapenems [3,4]. It was first found to be produced by  and  strains isolated from a Swedish patient of Indian origin who was admitted to hospital in New Delhi, India [5]. Thereafter, the   gene disseminated in various countries and regions such as China, the Middle East, South East Asia and Europe [4]. This multidrug resistance gene, which may be located on either plasmids or chromosome [3,6,7], leaves few therapeutic options for infected patients. In China, Ho et al. reported the first isolation of  -positive  from a 1-year-old infant and its mother in 2011 [8]. NDM-1-producing Enterobacteriaceae have since disseminated to various provinces in China, with the majority of such strains isolated from stool samples [9]. However, reports of isolation of carbapenem-resistant Enterobacteriaceae (CRE) from food samples remain scarce around the world.

Research – Vibrio spp. from Yesso scallop (Patinopecten yessoensis) demonstrating virulence properties and antimicrobial resistance

Wiley Online Library

Abstract

We report the prevalence and characterization of Vibrio spp. isolated from marketed Yesso scallop (Patinopecten yessoensis) in Korea. A total of 30 isolates including, V. parahaemolyticus (n = 2), V. alginolyticus (n = 9), V. fluvialis (n = 7), V. diabolicus (n = 7), V. anguillarum (n = 4) and V. aestuarianus (n = 1) were isolated and identified. The phenotypic pathogenicity tests demonstrated that, 18 (60%), 21 (70%), 18 (60%), 7 (23%), 22 (73%), 21 (70%), 9 (30%), and 11 (33%) of the isolates were positive for DNase, protease, gelatinase, lipase, phospho‐lipase, amylase, slime production, and haemolysis, respectively. PCR assays revealed the prevalence of toxR, tlh, VAC, vfh, hupO, and VPI genes among the isolates with varying combinations. A close genetic affinity among V. alginolyticus and V. diabolicus strains was observed. Also the virulence genes specific to one Vibrio species were detected among other species as well. In addition, 29/30 (97%) isolates were multidrug resistant, while higher resistance rates were shown for ampicillin, colistin, vancomycin, and cephalothin. The results imply that the scallops in Korean markets harbor Vibrio spp., which are potentially virulent and multidrug resistant, thus their public health implications should not be underrated.

Practical applications

For many decades, vibrios are known for its importance in seafoodborne illnesses. Yesso scallop is the most popular and extensively cultured scallop variety in Korea. Therefore, we sought to assess the marketed fresh Yesso scallops for the prevalence and molecular characterization of Vibrio species. A total of 30 strains were isolated and identified by a series of biochemical tests, subsequent gyrB gene sequencing and phylogenetic analyses. Six Vibrio spp. were identified with V. alginolyticus as the most prevalent. Interestingly, V. alginolyticus was genetically similar to V. diabolicus. Besides, the virulence genes specific to V. alginolyticus and V. parahaemolyticus were observed in other species as well. It suggests that the detection of the species‐specific genes does not ensure the correct identification of pathogenic vibrios. Further, the occurrence of V. parahaemolyticus‐specific virulence genes in other Vibrio spp. potentially complicates the correct tracking of V. parahaemolyticus infections. In addition, 73% of these Vibrio spp. isolates showed multiple antibiotic resistance (MAR) indices higher than 0.2, which signifies their high risk of infection. Collectively, these results provide important evidence that not only the well‐known pathogenic vibrios like V. parahaemolyticus, but also other Vibrio spp. can act alike because of their similar characteristics.

Research – Antimicrobial resistance in Campylobacter jejuni and Campylobacter coli from retail chilled chicken in the UK

FSA

 

The development and spread of antimicrobial resistance (AMR) is a public health concern worldwide. It is a complex issue driven by a variety of interconnected factors enabling microorganisms to withstand antimicrobial treatments to which they were once susceptible. The use of antibiotics is important in treating infections and preventing disease from arising in both animals and humans. However, the overuse and/or misuse of antibiotics in both animal husbandry and healthcare settings has been linked to the emergence and spread of microorganisms which are resistant to them, rendering treatment ineffective and posing a risk to public health.
The FSA is responsible for food safety. It assesses whether current agricultural practices may have an effect on public health via the food chain and works to affect change where this is considered to be the case. The transmission of AMR microorganisms through the food chain is thought to be one of the routes by which people are exposed to AMR bacteria. However, there is uncertainty around the contribution food makes to the problem of AMR in human infections. This report forms part of the project: A Microbiological Survey of Campylobacter Contamination in Fresh Whole UK Produced Chilled Chickens at Retail Sale (2015-2018) and presents AMR data for a subset of those Campylobacter isolates collected as part of this survey. There is a continued need to monitor the prevalence and types of AMR bacteria in retail chicken and other
foods to assess the risk to public health and also to inform a baseline to monitor future progress in reducing AMR in the food chain.

Research – Wiping out MRSA: effect of introducing a universal disinfection wipe in a large UK teaching hospital

ARIC Journal

mrsa

Background

Contamination of the inanimate environment around patients constitutes an important reservoir of MRSA. Here we describe the effect of introducing a universal disinfection wipe in all wards on the rates of MRSA acquisitions and bacteraemias across a large UK teaching hospital.

Methods

A segmented Poisson regression model was used to detect any significant changes in the monthly numbers per 100,000 bed days of MRSA acquisitions and bacteraemias from April 2013 – December 2017 across QEHB.

Results

From April 2013 to April 2016, cleaning of ward areas and multi-use patient equipment by nursing staff consisted of a two-wipe system. Firstly, a detergent wipe was used, which was followed by a disinfection step using an alcohol wipe. In May 2016, QEHB discontinued the use of a two-wipe system for cleaning and changed to a one wipe system utilising a combined cleaning and disinfection wipe containing a quaternary ammonium compound. The segmented Poisson regression model demonstrated that the rate of MRSA acquisition/100,000 patient bed days was affected by the introduction of the new wiping regime (20.7 to 9.4 per 100,000 patient bed days; p <0.005).

Discussion

Using a Poisson model we demonstrated that the average hospital acquisition rate of MRSA/100,000 patient bed days reduced by 6.3% per month after the introduction of the new universal wipe.

Conclusion

We suggest that using a simple one wipe system for nurse cleaning is an effective strategy to reduce the spread and incidence of healthcare associated MRSA.

Research – Bacteria found in ancient Irish soil halts growth of superbugs: New hope for tackling antibiotic resistance

Science Daily

Researchers analyzing soil from Ireland long thought to have medicinal properties have discovered that it contains a previously unknown strain of bacteria which is effective against four of the top six superbugs that are resistant to antibiotics, including MRSA. Antibiotic-resistant superbugs could kill up to 1.3 million people in Europe by 2050, according to recent research. The World Health Organisation (WHO) describes the problem as ‘one of the biggest threats to global health, food security, and development today.’

Research – Prevalence, genotyping, serotyping, and antibiotic resistance of isolated Salmonella strains from industrial and local eggs in Iran

Wiley Online Library

Abstract

This present study aimed to evaluate prevalence and characterization of serotypes, antimicrobial resistance (AMR) and genotypic profiles of Salmonella isolates in industrial and local eggs from Zanjan province of Iran. A total of 120 egg samples were collected and processed according to bacteriological analytical manual to isolate Salmonella strains from both eggs surface and contents. PCR method and genotyping were used to verify, identification and classification of isolates by screening invA genes and 16 s‐rRNA gene sequencing. Salmonella contamination rate in eggshell and contents of industrial and local eggs were 0% and 1.66%, respectively. High degree of AMR was observed to nalidixic acid and erythromycin. Gene sequencing for each isolates showed more similarity with Salmonella enterica subsp. enterica serovar Enteritidis and Salmonella enterica subsp. enterica serovar Typhimurium strains.

Practical applications

Salmonella contamination in eggs and the role of healthy chickens as reservoir and distributer of Salmonella in poultry farms can be a common food safety concern for public health. Therefore, Continuous monitoring of presence Salmonella and their antimicrobial resistance is of critical importance. Present study gives an insight of the current statues of egg’s contamination with Salmonella isolates, their antimicrobial resistance, genotupic profile, and epidemiological relationship in Iran.