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New study finds emerging pathogen inside brown locusts

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

UFS receives multimillion rand international funding for Advancement

2013-01-21

21 January 2013

We are one of four South African universities that have been selected to take part in a multimillion-rand programme to bolster private fund-raising and Advancement efforts.

The UFS will receive US$640 000 (R5 612 800) over a period of five years to use in advancement efforts.

In total, the US-based Kresge Foundation will make US$2.5 million available to the four universities, which includes the UFS, Durban University of Technology (DUT), Tshwane University of Technology (TUT) and the University of Johannesburg (UJ), over the next five years as part of a joint initiative with Inyathelo: The South African Institute for Advancement, to support the long-term financial sustainability of higher education institutions in South Africa.

Kresge will also provide programmes and support aimed at enhancing student access to universities and improving graduation rates.

Bill Moses, who directs Kresge’s education programme, says declining government support means that South African university officials need to tap into diversified philanthropic and private funding if they want to enhance their institutions’ ability to serve students better. “Stronger Advancement skills are critical to their success and ultimately to getting more South African students into universities and completing degrees. Advancement is not just about raising funds. It is the practice of building, maintaining and improving support, skills and other resources to ensure the sustainability of an institution,” explains Moses.

This latest Kresge initiative follows the success of a five-year partnership with Inyathelo that helped five high-profile South African institutions - the University of the Witwatersrand (Wits); the University of Pretoria (UP); the University of the Western Cape (UWC); the Cape Peninsula University of Technology (CPUT) and the Children’s Hospital Trust - increase their private fund-raising revenue threefold. The four universities will receive additional funding over the next five years and will serve as mentors to the new group of institutions.

In April last year, Kresge announced a new commitment to South African higher education that builds on its efforts in the United States to improve university access and help students succeed academically. Their ‘Promoting access and success at South African universities’ programme will seek to strengthen pathways to and through universities, especially for students who are often unprepared for university study. Moses says enhancing the ability of universities in South Africa to graduate the next generation of knowledge workers, will make it possible for the country to compete more effectively in the global economy. “Access to higher education in South Africa has improved dramatically since the end of Apartheid. A doubling of enrolment since 1994 has, however, contributed to serious challenges, including under-prepared students and disappointing graduation rates. We are confident that our programme will help address some of these obstacles to success,” says Moses.

Kresge has already funded several efforts that support its interest in strengthening pathways to and through universities this year, including a grant to the University of the Free State to expand the South African Survey of Student Engagement, as well as funding to the University of Pretoria to support a conference in January, which will highlight opportunities to promote access and success at South African universities.

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