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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

Judge Albie Sachs and Candice Mama discuss traumas of the past and forgiveness in the present

2015-08-05

Judge Albie Sachs embraces Candice Mama for her courage in confronting Eugene de Kock, who killed her father.

Two generations. Two stories of triumph. Two South Africans who have displayed immense courage.

Public Dialogue on Trauma, Memory, and Representations of the Past

Judge Albie Sachs and Candice Mama exchanged their experiences of past trauma and subsequent transformation in a public conversation. The event was co-hosted by Prof Pumla Gobodo-Madikizela and The Institute for Justice and Reconciliation (IJR) in Cape Town on Thursday 30 July 2015.

The event was the first instalment in a series entitled Public Dialogue on Trauma, Memory, and Representations of the Past. The theme of the discussion was ‘Intergenerational Dialogue on Trauma and Healing’.

"The aim of these public dialogue events we are co-hosting with IJR is to place the issues of trauma and memory, and the strategies that individuals and communities use to heal, in the public sphere," Prof Gobodo-Madikizela, Senior Research Professor in Trauma, Forgiveness, and Reconciliation Studies at the University of the Free State (UFS) said.

Judge Albie Sachs and Candice Mama in conversation

Former Constitutional Court Judge, Albie Sachs, talked about his participation in South Africa’s liberation struggle, the loss of his right arm in an assassination attempt, and meeting the man responsible – Henri van der Westhuizen. Despite years of exile and extended periods of solitary confinement, Judge Sachs maintains that “we need to acknowledge our history, not be trapped by it.” Judge Sachs also remarked, though, that “we’re seeing too much lamentation, not enough activation.” In a heartrending gesture, Judge Sachs embraced Candice Mama in a hug for her courage in confronting Eugene de Kock, who killed her father.

How poignant then, when Mama said, “I wanted to embrace the brokenness within him,” when she spoke about her meeting with De Kock. By the time I met with Eugene, I could meet him as a human being, not as a villain.” Mama believes that forgiving someone translates into an investment in the person you are forgiving and in your own sanity. She also emphasised the importance of dialogue to move our country forward: “When we share our stories with each other authentically, walls break down.”

This is a stance that Prof Gobodo-Madikizela supports strongly: “When we listen to one another, something unexpected emerges; we encounter the human in each other,” she said. “When we listen with open hearts to each other, we see and experience each other’s humanity.”

Building a bridge between research and society

Referring to the research aspect of the event, Prof Gobodo-Madikizela said that, "in establishing the series of public dialogue events, our vision is to create a bridge between scholarly research and the community at large, on the one hand, and a visual conscience of society, on the other." The UFS is collaborating with the IJR on this research project, which is funded by the Andrew W. Mellon Foundation. The endeavour is led by Prof Gobodo-Madikizela, who also serves as Board Member of the IJR.

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