Events during September 2023

Diphtheria is a potentially fatal disease caused by strains of Corynebacterium diphtheriae, C. ulcerans or C. pseudotubercolosis that express the diphtheria toxin. It can present as a respiratory infection or as non-healing skin wounds. Diphtheria was historically most likely to be caused by C. diphtheriae. It is very rare in England (typically <10 cases per year) due to a successful routine immunisation programme. However, there has been a recent gradual increase in cases over several years, particularly cutaneous infections and those caused by toxigenic C. ulcerans strains (which can be carried by household pets).

In 2022, there was a particulary large increase in diphtheria in England, with 87 cases and 3 deaths. This included 72 toxigenic C. diphtheriae infections in asylum seekers, thought to be aquired during their travel to the UK. Symptoms ranged from severe respiratory diphtheria to cutaneous infections and asymptomatic carriage. Similar increases of C. diphtheriae infections in travelling migrants have been seen in several European countries. Some of these isolates are multidrug resistant, including to macrolides, the default recommendation for treatment, and this will require careful monitoring.

It’s life, but not as we know it. Emerging parasitic diseases

This presentation will outline the content of Paola's Clincal Case Study from her Higher Specialist Portfolio in Medical Microbiology. Here she will present the initial clinical presentation, diagnosis and treatment of a case of neonatal sepsis that linked to a previous unusual maternal screening swab. She will also outline her experience of the Higher Specialist Diploma and her plans for developing a training plan within Microbiology QMC, Nottingham for future candidates within their trust.

This presentation is based on a case study used for a portfolio of Higher Specialist Diploma awarded by the IBMS. The presentation will look at how blood cultures taken on admission helped with diagnosis and appropriate treatment of a patient. It will also go in to brief detail on the organism isolated, Streptobacillus moniliformis.

To explore the molecular profiles of Acanthamoeba from laboratory-confirmed Acanthamoeba keratitis (AK) cases reported within the United Kingdom (UK) using DNA taken directly from clinical samples.

Acanthamoeba species are free-living organisms responsible for causing a debilitating, sight-threatening disease of the cornea. Of the 24 known Acanthamoeba species, 14 cause AK.

Thirty-five Acanthamoeba DNA-positive corneal samples from the Scottish Microbiology Reference Laboratories (SMiRL), Glasgow collection were selected from cases reported from 2017 - 2019. Following extraction of the DNA directly from each clinical specimen, the DNA was subjected to in-depth molecular typing using a nested PCR / bi-directional sequencing approach.

Molecular profiling was successful for 32 samples which comprised of two genotypes namely T3 and T4. The T4 genotype were further sub-typed; five sub-types existed namely; T4A, T4B, T4C, T4E and T4F.

Using a molecular typing assay applied directly to corneal tissue, this study highlights the T4 genotype and the T4A subtype are the predominant molecular variants of Acanthamoeba to cause ocular disease in the UK. Gaining in-depth information on the molecular profiling of Acanthamoeba is essential to increase our knowledge and understanding of the epidemiology, transmission pathways and potential associations with clinical outcomes for this rare, yet potentially debilitating ocular disease.

Antimicrobial resistance (AMR) in anaerobic bacteria varies greatly between institutions and countries. It is crucial that we have robust and widely available methods and perform regular surveillance to raise awareness of AMR amongst laboratory and clinical teams.

The UKARU offers a UK-wide service for the identification and antimicrobial susceptibility testing (AST) of anaerobic clinical isolates. Since 2016, this service has included weekly AST by agar dilution. The MIC population distributions for isolates referred are presented in real time via the ARUMIC platform, facilitating continuous monitoring of the development of resistance and valuable data for the review and development of epidemiological cut-offs (ECOFFs) and species-specific breakpoints, alongside the European Committee for Antimicrobial Susceptibility Testing (EUCAST).

During 2017 – 2021 EUCAST and the UKARU reviewed the AST methodology and breakpoints for anaerobes and developed a standardised disk diffusion method. Fastidious Anaerobe Agar with horse blood (FAA-HB) was used to test the most commonly isolated anaerobic bacteria including Bacteroides spp (n=170), Prevotella spp. (n=49), Fusobacterium necrophorum (n=51), Clostridium perfringens (n=58) and Cutibacterium acnes(n=54). The antimicrobials included for the initial phase were benzylpenicillin, piperacillin-tazobactam, meropenem, metronidazole and clindamycin with vancomycin included for the Gram positive organisms. Breakpoints for additional agents have just been published on the EUCAST website.

This lecture will provide insights into the development of AMR in anaerobic bacteria, the available AST methodologies and the importance of surveillance for this important group of pathogens.

Many of us have diagnosed, treated or researched Clostridiodes difficile infection (CDI) for many years and probably know the organism and the disease it produces very well indeed. But how well do we really know it? In truth, we only know this from our own perspective. What is it really like to suffer from CDI? How well do the pathways and guidance we contribute to function in the experience patients?

This talk will focus on patient experiences of CDI, what they can teach us as clinicians and researchers and why involving patients and the public in designing our research and clinical services can help everyone.

Understanding your laboratories baseline data is the most important first step to identify where to improve services. Data is key to understanding preanalytical processes, simple things such as the location of phlebotomy clinics, the timings of transport collections, the number of paper requests all have an impact on specimen reception workflows and specimen turnaround times.

Many labs still continue to measure a specimen's turnaround time from the moment it arrives at the lab, which is too late.

We will demonstrate how data modelling and innovative transport solutions will improve system workflows, reduce specimen rejections, smooth out specimen arrivals, reduce the output of CO2 and meet the preanalytical quality requirements for your next UKAS inspection.

Blood Transfusion follows binary guidelines designed to protect against the formation of allo red cell antibodies capable of causing Haemolytic Disease of the Foetus and Newborn. For the first time, in 2021, the England and Wales Census included a gender identity question, ‘Is the gender you identify with the same as your sex registered at birth?’. 0.5% of respondents answered ‘No’ (262 000 people) of which 48 000 identified as a trans man, 30 000 as non-binary and 18 000 as another gender identity. Thus, there is a small, but significant, population of Transgender and Gender Diverse (TGD) individuals in society.

What are the implications for Blood Transfusion? There are several scenarios:

The lab could receive a sample labelled male and issue blood components which fail to meet the requirements of Kell negative and, if applicable, CDE negative red cells to someone with childbearing potential.

The lab could receive an antenatal sample labelled male and the LIMS does not allow staff to perform all the same testing and product issuing as it would for a female.

Some TGD individuals who have transitioned may get a new NHS number. Lab staff may be unaware and lab records are not merged which means all future transfusion requests are relying solely on antibody screening results with no historical transfusion information.

The clinical consequences of these errors are missed incompatibilities, special requirements not met (SRNM) errors and immediate or delayed transfusion reactions with a potential for major morbidity or mortality.?All the circumstances described above illustrate that provision of healthcare is not uniform?for?all patients in the UK and could be described as indirect discrimination - a policy or practice that is identical for all people but has an unfair or disproportionate effect on a people with a protected characteristic.

HR and OH departments – how to work with them to achieve the best results