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24 July 2023 | Story André Damons | Photo Supplied
Tyla Baker
Tyla Baker, a postgraduate student in the Department of Microbiology and Biochemistry at the University of the Free State (UFS).

Yeast and other filamentous fungi, which pose a great risk to the health of immune-compromised or suppressed individuals, can be found in various drinking water sources such as ground, spring, surface, and tap water. These opportunistic pathogens may cause severe to fatal infections and can range from superficial to bloodstream or systemic infections.

This is according to Tyla Baker, a postgraduate student in the Department of Microbiology and Biochemistry at the University of the Free State (UFS). She is studying for her MSc degree in Microbiology under the supervision Prof Carlien Pohl-Albertyn, National Research Forum (NRF) SARChI Research Chair in Pathogenic Yeasts. Prof Jacobus Albertyn and Dr Jolly Musoke are her co-supervisors.

Baker says the fungi in the water highlights that current water treatment processes are not efficient in their removal from water destined for household use. “These infections may not be harmful to people with healthy immune systems, but do pose a great risk to the health of immune-compromised or suppressed individuals. 

Definite possibility to contract fungal infections from polluted water 

“As the number of people with immune systems that are less functional (e.g. premature babies, elderly persons, people with cancer, diabetes or other serious diseases, HIV+ persons, transplant patients) increases, the number of people at risk of fungal infection also increases,” says Baker.

According to Baker, a previous study done in Brazil has identified yeast in bottled mineral water as well as municipally supplied tap water. The potential risk to contract fungal infections from polluted water sources is a definite possibility but more research is required to fully understand and determine the level of risk and the extent of its effects, she says. In the context of Mangaung, it is a concern that untreated water from sewage works as well as other sewage often leaks into the environment (as evidenced by numerous recent articles in local newspapers). These waters are potential carriers of large numbers of pathogens (including pathogenic yeasts/fungi) that may increase the risk to people coming into contact with it.

Baker says there is a good chance people are consuming these kinds of micro-organisms daily, considering that yeast and other filamentous fungi can also form biofilms inside pipes and spread as the impact of water flow dislodges these cells. “People will not even be aware that they are consuming these micro-organisms, some fungi are considered nuisance microbes and may cause a change in the smell and taste of water which may act as an indicator that the water is contaminated, but tests would be needed to confirm this,” she says.

The effects of consuming these fungi are still a grey area of research since the full extent of the consumption of yeast is still unknown, but there are studies being conducted to elucidate the full impact of this occurrence, says Baker. The risk depends on the immune status of the person, the specific species of yeast/fungus ingested, and the number of cells/spores ingested.

Culture-dependent and independent methods

 “It is important to know that many pathogenic yeasts and other fungi are opportunistic pathogens, meaning they infect individuals whose immune systems are compromised due to various reasons such as illness (HIV/AIDS, cancer, TB etc.), undergoing organ transplants or even something as simple as using antimicrobial agents such as antibiotics. 

“Taking this into account, along with the HIV/AIDS statistics in South Africa, which has a prevalence rate of 13,7% with approximately 8,2 million people in 2021 living with HIV, these individuals are more susceptible to infection by these opportunistic pathogens. Some of these pathogenic yeasts are also multidrug resistant or show resistance to readily available antifungals, such as fluconazole, which hinders the ability of healthcare professionals to efficiently treat infections to avoid fatal/severe outcomes,” explains Baker.  

For her studies, she will be testing for fungi in water by using a combination of culture-dependent and independent methods to try and identify yeast present in wastewater. Baker says culture-dependent techniques will include culturing (growing) yeast on an appropriate medium while culture-independent techniques will include more intricate molecular work in the form of a multiplex PCR (polymerase chain reaction) which will enable her to identify an array of pathogenic yeasts present in samples.

According to Baker, people can stay safe by boiling water before drinking it, although temperatures above 100°C are required to kill most harmful microbes. Regular cleaning of shower heads and faucets help to prevent build-up which may act as a surface to which fungi will attach to and grow. Another way to stay safe is to maintain and regularly inspect water filters for damage and avoid contact with untreated sewage.

News Archive

UFS welcomes two new deans in the faculties of Theology and Law
2014-08-04

 

The university council has approved the appointment of two deans: Prof Fanie Snyman, at the Faculty of Theology and Prof Caroline Nicholson, at the Faculty of Law.

Both professors offer the university a wealth of knowledge and experience in research and teaching.

Prof Fanie Snyman

Prof Snyman joined the university in 1984 as a senior lecturer in the Department Old Testament. His career followed a steadfast ascent which led him to attaining the title of professor and head of department the following year. On 1 July 2013, Prof Snyman took on the additional role of acting dean of the faculty.

As dean, he set out a clear vision of academic leadership with four primary focus areas: research, teaching and learning, internationalisation and regional engagement.

He is the author of eight books and contributed to seven internationally- and twelve nationally-published books. He has published nine articles in international journals and about 60 more in accredited journals.

Prof Snyman proposes to bring staff members together to extensively rethink and reposition the faculty in terms of identity, transformation and the way forward. “We live in a complex world, characterised by uncertainty and in constant change. This calls for complex but also innovative solutions,” he says.

Prof Caroline Nicholson

Prof Caroline Nicholson was born in Scotland and came to South Africa as a young child. She obtained her BProc and LLB degrees at the University of the Witwatersrand and completed her articles of clerkship at Chernin’s in Hyde Park Corner, Johannesburg. Prof Nicholson was admitted as both an attorney and notary public of the then Supreme Court of South Africa in 1986.

In 1986 she joined the University of South Africa (UNISA ) as a lecturer and remained there until 1999. During this time she completed an LLM in Banking Law and an LLD in Comparative Conflict of Laws – focusing on international parental child abduction. During the same year she moved to the Faculty of Law at the University of Pretoria where she worked for the last fifteen years. In 2003 she completed a Postgraduate Diploma in Alternative Dispute Resolution (ADR) and has an abiding interest in ADR, especially within the Family Law context.

Prof Nicholson has produced numerous articles and research presentations on a variety of legal subjects. Her primary areas of interest are, however, legal education and child law. She is known both nationally and internationally for her research contributions.

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