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17 February 2025 | Story Andre Damons | Photo Supplied
Prof Carolina Pohl-Albertyn
Prof Carlien Pohl-Albertyn is the NRF SARChI Research Chair in Pathogenic Yeasts at the UFS.

A new study by researchers from the University of the Free State (UFS), the National Health Laboratory Service, and the University of Venda has confirmed for the first time that common brown locusts are carriers of pathogenic yeasts that can cause severe infections in humans – especially in people with compromised immune systems or who are seriously ill.

The study, ‘South African brown locusts, Locustana pardalina, hosts fluconazole resistant, Candidozyma (Candida) auris (Clade III)’, highlights for the first time the presence of the pathogenic (disease-producing) fungal yeast C. auris in the digestive tract of the locusts, and shows their potential in disseminating this emerging pathogen. The research started in April 2022, when 20 gregarious (swarming) adult locusts were collected during a large locust outbreak which occurred from September 2021 to May 2022 in the semi-arid Eastern Karoo region in the Eastern Cape. The study is still under peer review.

According to Prof Carlien Pohl-Albertyn, National Research Foundation (NRF) SARChI Research Chair in Pathogenic Yeasts, three C. auris strains were isolated from three different adult locusts, two of which also harboured strains of another potentially pathogenic yeast, Candida orthopsilosis. “The fact that we were able to isolate C. auris from 15% of the sampled locusts, using non-selective media and a non-restrictive temperature of 30°C, may indicate that C. auris is abundant in the locusts and that specific selective isolation is not mandatory,” Prof Pohl-Albertyn said.

“Interestingly, C. auris was isolated from the fore- and hindgut of the locusts. Isolation from the foregut, which is dedicated to food intake and storage, filtering and partial digestion, indicates that C. auris was probably obtained by the locusts via feeding activities. Isolation from the hindgut confirms that C. auris can survive the digestive processes in the midgut and is likely to be released back into the environment via faeces.”

Healthy humans are not at great risk

One of the C. auris strains was studied in more detail. This strain was not resistant to disinfectants but showed decreased susceptibility to the common antifungal drug fluconazole. This is a characteristic of this yeast species and thus not surprising. Most of the emerging pathogenic yeasts show this intrinsic resistance. This highlights the urgent need to discover and develop new antifungal drugs.

Prof Pohl-Albertyn, also a Professor of Microbiology in the UFS Department of Microbiology and Biochemistry, says, “Healthy humans are not at great risk for infection by this yeast and there is currently no proof that ingestion may be harmful to them. This is unfortunately not the case for people with compromised immune systems or who are seriously ill. However, few susceptible people come into direct contact with the locusts in South Africa.”

She added that there are treatment options available, using other antifungal drugs, but C. auris can become resistant to all the currently available antifungal drugs.

Importance of the study

“The fact that locusts are a food source for other animals, such as birds, could lead to eventual distribution of the yeast to people. In other countries, wild locusts are a food source for humans and there more direct transmission may be possible,” Prof Pohl-Albertyn said.

She explained that this study tries to answer questions regarding the natural hosts of this emerging pathogen and how it may facilitate the spread of the pathogen to the rest of the environment. The study is one part of the puzzle regarding how new pathogens may emerge from the environment and spread to people.

“One of the questions in the field of pathogenic yeasts is how C. auris was able to emerge as a pathogen in several different countries in a relatively short period. It is well known as a hospital-acquired pathogen, but it is not known where in the environment it occurs naturally, and which environmental factors may have shaped its evolution and ability to cause human infections. This has implications for the prevention of the spread of this specific yeast species, as well as our preparedness for new pathogenic yeasts that may be emerging from the environment.”

News Archive

DNA sequencer launched at the UFS
2013-11-25

Dr Gansen Pillay, Deputy Chief Executive Officer of the National Research Foundation, explaining to the scholars what will be expected of them.

The University of the Free State (UFS) can now collect immensely valuable data on drug resistance in HIV/Aids and TB with the new DNA sequencer that was launched recently at the International workshop on HIV/AIDS and TB drug resistance at the Bloemfontein Campus.

The DNA sequencer will allow the Free State province to produce viral and bacterial genetic data to fight the local development of HIV/ Aids and TB drug resistance.

The HIV and TB epidemics have expanded very fast and South Africa now has the largest HIV and TB treatment programme in the world, with over 2 million patients on treatment. However, these successful treatment programmes are now being threatened by the appearance of drug resistance.

The Free State province has been at the forefront of fighting HIV drug resistance in South Africa and has one of the most advanced treatment programmes for the management of resistance strains in the country. In addition, researchers at the University of the Free State are leading partners in the Southern African Treatment and Resistance Network (SATuRN; www.bioafrica.net/saturn), a research network that has trained over 2 000 medical officers in the treatment of drug resistance strains.

The Department of Medical Microbiology and Virology in the Medical School at the UFS has partnered with the provincial department of health, the Medical Research Council (MRC) and the Delegation of the European Union to South Africa to fund a dedicated DNA sequencer machine that will be used to generate HIV and TB drug-resistance results. This new machine will enable cutting-edge research to take place, using the data in the province and, importantly, support patients with resistance strains to have access to advanced genotypic testing techniques.

“HIV drug resistance is a very serious problem in South Africa, and the recent advances in DNA testing technology allow clinicians in the province to access drug resistance testing, which enables them to manage patients appropriately who fail treatment, and use the results to cost-effectively extend and improve patients’ lives,” says Dr Cloete van Vuuren, Specialist in Infectious Diseases at the UFS’s Faculty of Health.

Dr Dominique Goedhals, pathologist from the Department of Medical Microbiology and Virology at the UFS, adds: “We have been looking forward to expanding our work with the clinicians and researchers, using DNA sequencing to shed light on the causes and consequences of drug resistance in urban and rural settings in the province.”

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