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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

Wayde runs 100 m personal best in Slovenia
2017-06-21

Description: Wayde runs 100 m personal best in Slovenia Tags: Wayde runs 100 m personal best in Slovenia

Wayde van Niekerk is in great form leading up to the
World Championships in London in August.
Photo: Charl Devenish

“This also bodes well for my two main distances." This is what Wayde van Niekerk said according to www.iaaf.org, after running a personal best time of 9.94 in the 100 m in Velenje, Slovenia, on 20 June 2017. The Kovsie athlete improved his previous best by 0.04 seconds at the 22nd International Athletics Meeting.

Van Niekerk was referring to the other distances in which he excels – the 200 m and 400 m. The 400 m world record-holder said he was pleased with his latest run: "It's my best time and I'm glad the competition ended the way I wanted it to.”

National 200 m record and world’s fastest in 2017
His feat in the 100 m was his latest success, as he recently became the national record-holder in the 200 m again, and also the fastest man on the planet in this distance in 2017. After he ran a 19.90, the world’s fastest this year, when he won the South African title in Potchefstroom in April, the American Christian Coleman (19.85) improved on that.

However, Van Niekerk ran a 19.84 in the 200 m at the Racers Grand Prix in Kingston, Jamaica, on 11 June 2017. This was 0.06 seconds quicker than his personal best, and 0.03 seconds better than Anaso Jobodwana’s national record of 19.87.

Same pace a second time in a week
It was also the second time in a week that he ran a 19.84 in the 200 m. This after he did it on a temporary built track at the Boost Boston Games on 4 June 2017. The race was run on a straight street course and was therefore not officially recognised as a record.

He seems to be in good shape leading up to his attempt to run a double, his favourite 400 m and the 200 m, at the World Championships in London, England, in August.

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