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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

Premiere of the documentary on King Moshoeshoe - Address by the Rector

2004-10-14

Address by the rector and vice-chancellor of the University of the Free State, prof Frederick Fourie, at the premiere of the documentary on King Moshoeshoe, Wednesday 13 October 2004

It is indeed a privilege to welcome you at this key event in the Centenary celebrations of the University of the Free State.

We are simultaneously celebrating 100 years of scholarship with 10 years of democracy

Today is a very important day with great significance for the University. This Centenary is not merely a celebration of an institution of a certain age. It is a key event in this particular phase of our history, in our transformation as an institution of higher learning, in taking the creation of a high-quality, equitable, non-racial, non-sexist, multicultural and multilingual university seriously.

This is about building something new out of the old, of creating new institutional cultures and values from diverse traditions.

It is about learning together - as an higher education institution - about who we are where we come from – to decide where we are going.

It is about merging the age-old tradition of the university, of the academic gown, with the Basotho blanket, the symbol of community engagement.

Then why is it important that we remember Moshoeshoe, where does he fit into our history?

In the Free State province, where large numbers of Basotho and Afrikaners (and others) now live together, a new post-apartheid society is being built in the 21st century.

The challenge is similar to that faced by Moshoeshoe 150 years ago. As you will see tonight, he did a remarkable thing in forging a new nation out of a fragmented society. He also created a remarkable spirit of reconciliation and a remarkable style of leadership.

Not all people in South Africa know the history of Moshoeshoe. Many Basotho – but not all – are well versed in the history of Moshoeshoe, and his name is honoured in many a street, town and township. Many white people know very little of him, or have a very constrained or even biased view of his role and legacy. In Africa and the world, he his much less known than, for instance, Shaka. (In Lesotho, obviously, he is widely recognised and praised.)

We already benefit from his legacy: the people of the Free State share a tradition of moderation and reconciliation rather than one of aggression and domination.

With Moshoeshoe, together with Afrikaner leaders and reconciliators such as President MT Steyn and Christiaan de Wet, we have much to be thankful for.

Our challenge is take this legacy further: to forge a new society in which different cultural, language and racial groups – Basotho, Afrikaners and others – will all feel truly at home.

Bit by bit, on school grounds, on university campuses, in each town and city, people must shape the values and principles that will mould this new non-racial, multicultural and multilingual society.

A shared sense of history, shared stories and shared heroes are important elements in such a process.

Through this documentary film about King Moshoeshoe, the UFS commits itself to developing a shared appreciation of the history of this country and to the establishment of the Free State Province as a model of reconciliation and nation-building.

Moshoeshoe is also a strong common element, and binding factor, in the relationship between South Africa / the Free State, and its neighbour, Lesotho.

For the University of the Free State this also is an integral part of real transformation – of creating a new unity amidst our diversity.

Transformation has so many aspects: whilst the composition of our student and staff populations have been changing, many other things change at the same time: new curricula, new research, new community service learning projects.

In also includes creation of new values, new (shared) histories, new (shared) heroes.

It includes the incorporation of the Qwaqwa campus, which serves a region where so many of the children of Moshoeshoe live, including her majesty Queen Mopeli.

We see in Moshoeshoe a model of African leadership – of reconciliation and nation-building – that can have a significant impact in South Africa and Africa as a whole.

We also find in the legacy of King Moshoeshoe the possibility of an “founding philosophy”, or “defining philosophy”, for the African renaissance.

To develop this philosophy, we must gain a deeper understanding of what really happened there, of his role, of his leadership.

Therefore the University of the Free State will encourage and support further research into the history, politics and sociology of the Moshoeshoe period, including his leadership style.

We hope to do this in partnership with National University of Lesotho.

The Moshoeshoe documentary is one element of a long-term project of the UFS. The other elements of the project that we are investigating are possible PhD-level research; a possible annual Moshoeshoe memorial lecture on African leadership; and then possible schools projects and other ways and symbols of honouring him.

It is my sincere wish that all communities of the Free State and of South Africa will be able to identify with the central themes of this documentary, and develop a shared appreciation for leaders such as King Moshoeshoe and the legacy of peace, reconciliation and nation-building that they have left us.

Prof. Frederick Fourie
Rector and Vice-Chancellor
University of the Free State
13 October 2004.

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