Publications by authors named "Abraham Niehaus"

Background: The molecular epidemiology of carbapenem-resistant Enterobacterales in Cape Town remains largely unknown.

Objectives: This study aimed to describe the molecular epidemiology, resistome, virulome and mobilome of carbapenem-resistant (CRKP) within Cape Town to guide therapy, antimicrobial stewardship and infection prevention and control practices.

Methods: Eighty-five CRKP isolates from hospitalized patients underwent WGS as part of a prospective, multicentre, cross-sectional study, conducted between 1 November 2020 and 30 November 2022, across public-sector and private-sector hospitals in Cape Town, South Africa.

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Background: Carbapenem-resistant Enterobacterales (CRE) are a substantial problem in Cape Town. CRE epidemiology is largely unknown and mortality remains high.

Objectives: To describe and characterize the clinical and microbiological epidemiology of CRE within Cape Town hospitals to better inform therapy with regard to current and novel antibiotics, as well as improve antimicrobial stewardship (AMS), and infection prevention and control (IPC).

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Intestinal helminths and microbiota share the same anatomical niche during infection and are likely to interact either directly or indirectly. Whether intestinal helminths employ bactericidal strategies that influence their microbial environment is not completely understood. In the present study, the hypothesis that the adult hookworm produces molecules that impair bacterial growth , is tested.

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Antibiotic stewardship of hospital-acquired infections because of difficult-to-treat resistant (DTR) Gram-negative bacteria is a global challenge. Their increasing prevalence in South Africa has required a shift in prescribing in recent years towards colistin, an antibiotic of last resort. High toxicity levels and developing resistance to colistin are narrowing treatment options further.

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Article Synopsis
  • The study addresses the challenge of treating gonorrhoea due to increasing multidrug-resistant strains and emphasizes the importance of cost-effective molecular diagnostic tests for effective treatment.
  • It involved analyzing mRNA expression levels of antibiotic resistance genes and efflux pump genes in clinical samples from KwaZulu-Natal, South Africa, using techniques like quantitative real-time PCR and whole-genome sequencing.
  • Key findings identified specific gene expression markers that significantly predict resistance, suggesting that monitoring these markers could improve antimicrobial stewardship and patient management in gonorrhoea treatment.*
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Article Synopsis
  • Antimicrobial resistance is making it harder to treat infections, which is why there's a need for rapid tests to determine how effective antibiotics will be against certain bacteria.
  • This study focused on identifying genetic markers of resistance in samples from a sexually transmitted infections clinic in Durban, South Africa, using real-time PCR for quick results.
  • Results showed a high agreement (≥92%) between the genetic tests and traditional culture methods for detecting resistance, suggesting that these molecular assays could be useful as a fast diagnostic tool in STI management, though further research with larger groups is needed.
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Antimicrobial resistance (AMR) is a major challenge to managing infectious diseases. Africa has the highest incidence of gonorrhoea, but there is a lack of comprehensive data from sparse surveillance programs. This study investigated the molecular epidemiology and AMR profiles of Neisseria gonorrhoeae isolates in KwaZulu-Natal province (KZN), South Africa.

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and are the four main aetiologies of sexually transmitted infections responsible for vaginal discharge syndrome (VDS). Commercially available multiplex polymerase chain reaction (PCR) assays are expensive and generally not customisable. We evaluated a highly customisable singleplex PCR approach by testing it in parallel with the Anyplex™ II STI-7 detection assay in a cohort of South African women that presented with VDS between May 2016 and January 2017.

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Africa has the highest incidence of infections globally, but data on these isolates is scarce. Here, we report six genome sequences with five novel sequence types isolated from patients with uncomplicated genitourinary gonorrhea in South Africa.

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Diagnosis of bacterial vaginosis (BV) in resource-poor settings relies on semiquantitative microscopy algorithm such as the Nugent score (NS). We evaluated a quantitative real-time PCR (qPCR) assay to detect and quantify individual BV-associated bacterial communities. Vaginal swabs from 247 South African women attending an STI clinic were evaluated for BV using NS.

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Background: Drug-resistant tuberculosis (TB) remains extremely difficult to treat because there are often few remaining active medications and limited diagnostic options to detect resistance. Resistance to isoniazid is typically caused by mutations in either katG or the inhA promoter. inhA mutations confer low-level resistance to isoniazid and cross-resistance to ethionamide while katG mutations confer high-level isoniazid resistance and no cross-resistance.

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Background: Salmonella enterica serotype Enteritidis is a universally recognized cause of foodborne disease. In South Africa, outbreaks of foodborne disease are generally under reported. We investigated the etiology of acute gastroenteritis in 216 patients who presented to a rural hospital in KwaZulu-Natal, South Africa, after consuming a meal at a school function.

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