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Fungi in water pose great risk to immune-compromised individuals

24 July 2023 | Story André Damons | Photo Supplied

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 receives R13,7 Million for Research into Prehistoric Organisms

2007-03-27

Some of the guests attending the launch of the research contract are: Dr Siyabulela Ntutela (Deputy Director: Biotechnology at the Department of Science and Technology), Dr Godfrey Netswera (Manager of Thuthuka and the Support Programme at the National Research Foundation (NRF)), Dr Esta van Heerden (Platform Manager and lecturer at the Department of Microbial, Biochemical and Food Biotechnology at the UFS), Mr Butana Mboniswa (Chief Executive Officer of BioPAD), and Mr Vuyisele Phehani (Portfolio Manager for BioPAD).
Photo: Leonie Bolleurs

The University of the Free State (UFS) has been awarded a massive R13,7 million contract to conduct research into prehistoric micro-organisms which live under extreme conditions, for example in mineshafts.

This is one of the biggest research contracts awarded to the UFS in recent years.

The biotechnology research contract was awarded to the UFS by BioPAD, a South African biotechnology company that brokers partnerships between researchers, entrepreneurs, business, government and other stakeholders to promote innovation and create sustainable biotechnology businesses.

The project is endorsed by the Department of Science and Technology and the National Research Foundation (NRF), which contributes to the bursaries of the 17 postgraduate students on the programme.

The contract involves the establishment of a Platform for Metagenomics - a technique which allows researchers to extract the DNA from microbes in their natural environment and investigate it in a laboratory.

“Through this platform we will be able to understand deepmine microbial populations
and their potential application in the search for life in outer space. It is most likely
that, if life were to be found on other planets in our solar system, it would probably
resemble that which existed millions of years ago on earth. Apart from all this, these
organisms have unique properties one can exploit in biotechnological application for
South Africa and its community,” said Dr Esta van Heerden, platform manager and
lecturer at the UFS Department of Microbial, Biochemical and Food Biotechnology.
She is assisted by her collegues, Prof. Derek Litthauer and Dr Lizelle Piater.

“The platform aims to tap into the unique genetic material in South African mines
which will lead to the discovery of new genes and their products. These new and unique products will find application in the medical field (anti-cancer, anti-bacterial en anti-viral cures), the industrial sector (nanotechnology, commercial washing agents and the food industry), environmental sector (pollution management, demolition of harmful metals and other toxic waste),” said Dr Van Heerden.

According to Dr Van Heerden, the Metagenomics Platforms stems from the Life in
Extreme Environments (LExEN) programme which was started in 1994 by Princeton
University in the United States of America (USA) in South African mines with grants
from among others the National Aeronautics and Space Administration (NASA) and
the National Science Foundation (NSF) in the USA. Other international collaborators
on the project include Geosynec Consultants Inc. (USA), Oak Ridge National
Laboratory (USA), the University of Tennessee (USA) and in South Africa the
Universities of the Witwatersrand, North West and Limpopo and companies like BHP
Billiton, MINTEK and mining companies like Harmony, Gold Fields and AngloGold
Ashanti.

The research field laboratory of the Metagenomics Platform, which was situated in
Glen Harvey, was moved to the Main Campus of the UFS in Bloemfontein. “In this
way the university has become the central hub for all research programmes. We are
also the liaison between the LExEN programme and the various mining companies
involved,” said Dr Van Heerden. The new laboratory was introduced during the
launch of the research contract.

“Our decision to commit BioPAD to this project stems from the company’s commitment to advance human capacity development to strengthen South Africa’s research infrastructure. It is also part of our aim to create and protect intellectual property,” said Mr Butana Mboniswa, Chief Executive Officer of BioPAD.

Talking on behalf of the UFS senior management, Prof. Teuns Verschoor, Vice-Rector
of Academic Operations, said that the university shares the excitement to be part of
the exploration of unknown forms of life, the discovery of new genes and
their products and in applying newly gained knowledge to better understand our
universe.

Media release
Issued by: Lacea Loader
Assistant Director: Media Liaison
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: loaderl@ufs.ac.za
27 March 2007

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