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Disinfectants – are we at the end of the road?

09 October 2020 | Story Leonie Bolleurs | Photo Supplied

SARS-CoV-2, an enveloped coronavirus, is susceptible to most disinfectants. Therefore, the majority of disinfectants, including those containing 70% ethanol, should be able to kill the virus fairly quickly.

Nevertheless, it was found that some bacteria are highly resistant to several commercially available disinfectants. These bacteria are currently still quite rare, and the work of the Veterinary Biotechnology group at the University of the Free State (UFS) aims to prevent the development of more highly resistant bacteria.

The research group in the Department of Microbial, Biochemical and Food Biotechnology is working on disinfectant resistance. They recently published an article, ‘Molecular basis of bacterial disinfectant resistance’.

Group members include: Prof Robert Bragg, professor in the department; Dr Charlotte Boucher, research associate; Samantha Mc Carlie, master’s student and laboratory manager; master’s students, Twyne Skein and Gunther Staats; honours students, Carlo Visser, Bernadette Belter, Boudine van der Walt, Jacky Huang, and Mart-Louise van Zyl; and an NRF intern, Gloria Kankam.

According to Mc Carlie, the work being done on disinfectant resistance is largely attributable to the major issues currently experienced with antibiotic resistance.

“Antibiotic resistance is becoming one of the biggest life-threatening challenges of our time – even overshadowing the current COVID-19 pandemic – as multidrug-resistant infections are becoming increasingly difficult to treat. Bacterial infections that are present in hospitals and agriculture are becoming unresponsive to many of the antibiotics currently in use, marking the start of a post-antibiotic era.”

It is predicted that by 2050, antimicrobial resistance could lead to as many deaths as cancer causes today and could account for between 10 million and 50 million deaths per year.

Lack of proper biosecurity

Mc Carlie says the resistance to antibiotics is spreading rapidly due to a lack of proper biosecurity measures in the food and agricultural industry as well as in the hospital environment, even if the COVID-19 pandemic has gone a long way towards increasing the awareness of hospital staff to the importance of good biosecurity. Millions of rands are lost every year due to multidrug-resistant infections in the dairy and poultry industries of South Africa, and superbugs are present in almost every major hospital in the country.

“Currently, the best viable protection we have against bacteria is biosecurity and disinfectants. Biosecurity relies heavily on the use of disinfectants to control bacterial growth. This makes it only more troubling that disinfectant resistance is emerging at an alarming rate.”

She believes it is important to understand the mechanisms of resistance in order to combat resistance to disinfectants. “Once the mechanisms are identified, possible solutions can be investigated.”

The research group is currently monitoring disinfectant resistance, looking at which microorganisms are resistant to which disinfectants. They take environmental samples and test the levels of disinfectant resistance to observe the development and spread thereof.

Once they have an understanding of the development of disinfectant resistance, the Veterinary Biotechnology group will be able to make recommendations to hospitals and the agricultural industry on how to prevent the development of these resistant microorganisms.

“As we learn more about these highly resistant isolates, it will direct day-to-day treatment of multidrug-resistant infections and hopefully aid in the fight against antibiotic and disinfectant resistance,” says Mc Carlie.

The dangers of over-prescribing

“Resistance to antimicrobials such as antibiotics and disinfectants is a natural occurrence. We did not invent antibiotics, we discovered them, and so bacterial resistance has been around for as long as antibiotics have – as a survival strategy.”

“However, the widespread use of antimicrobials creates selective pressure for those microorganisms that are resistant to the antimicrobial being used. Over-prescribing and improper use of antibiotics has led to widespread antibiotic resistance. We expect the same trend to be seen with disinfectant resistance in the near future,” says Mc Carlie.

She urges the public to take note that disease-causing microorganisms can become resistant to antibiotics and disinfectants if they are not used correctly. A course of antibiotics should always be taken at the correct time and until the last dose. In the same way, disinfectants should be used at the recommended level and not diluted below that level.

These resistant organisms are causing major issues in the agricultural and medical industries, but this effect has not been seen in households yet. As long as disinfectants are used correctly, most will be able to kill the novel coronavirus.

There is, however, a need to establish tests on the efficacy of the massive number of ‘hand sanitisers’ that are now suddenly available.

According to Prof Bragg, existing disinfectants and hand sanitisers have been specifically tested against SARS-CoV-2 and have been found to be effective. He says the undergraduate students in the department will be evaluating a wide range of different hand sanitisers as part of their practical training.

Mc Carlie adds that the excessive use of poor-quality disinfectants as hand sanitisers can result in bacteria developing resistance to these disinfectants. “It is therefore very important that reliable high-quality disinfectants are used as hand sanitisers during this COVID-19 crisis, otherwise we will be replacing one crisis with a potentially even bigger crisis.”

Mc Carlie believes there is a need to start looking at alternatives to control bacterial growth. “Disinfectants are currently the only viable option, and if these microorganisms become resistant to disinfectants as well, we will have nowhere else to turn,” she says.

News Archive

“To forgive is not an obligation. It’s a choice.” – Prof Minow during Reconciliation Lecture

2014-03-05

“To forgive is not an obligation. It’s a choice.” – Prof Minow during the Third Annual Reconciliation Lecture entitled Forgiveness, Law and Justice.
Photo: Johan Roux

No one could have anticipated the atmosphere in which Prof Martha Minow would visit the Bloemfontein Campus. And no one could have predicted how apt the timing of her message would be. As this formidable Dean of Harvard University’s Law School stepped behind the podium, a latent tension edged through the crowded audience.

“The issue of getting along after conflict is urgent.”

With these few words, Prof Minow exposed the essence of not only her lecture, but also the central concern of the entire university community.

As an expert on issues surrounding racial justice, Prof Minow has worked across the globe in post-conflict societies. How can we prevent atrocities from happening? she asked. Her answer was an honest, “I don’t know.” What she is certain of, on the other hand, is that the usual practice of either silence or retribution does not work. “I think that silence produces rage – understandably – and retribution produces the cycle of violence. Rather than ignoring what happens, rather than retribution, it would be good to reach for something more.” This is where reconciliation comes in.

Prof Minow put forward the idea that forgiveness should accompany reconciliation efforts. She defined forgiveness as a conscious, deliberate decision to forego rightful grounds of resentment towards those who have committed a wrong. “To forgive then, in this definition, is not an obligation. It’s a choice. And it’s held by the one who was harmed,” she explained.

Letting go of resentment cannot be forced – not even by the law. What the law can do, though, is either to encourage or discourage forgiveness. Prof Minow showed how the law can construct adversarial processes that render forgiveness less likely, when indeed its intention was the opposite. “Or, law can give people chances to meet together in spaces where they may apologise and they may forgive,” she continued. This point introduced some surprising revelations about our Truth and Reconciliation Commission (TRC).

Indeed, studies do report ambivalence, disappointment and mixed views about the TRC. Whatever our views are on its success, Prof Minow reported that people across the world wonder how South African did it. “It may not work entirely inside the country; outside the country it’s had a huge effect. It’s a touchstone for transitional justice.”

The TRC “seems to have coincided with, and maybe contributed to, the relatively peaceful political transition to democracy that is, frankly, an absolute miracle.” What came as a surprise to many is this: the fact that the TRC has affected transitional justice efforts in forty jurisdictions, including Rwanda, Sierra Leone, Cambodia and Liberia. It has even inspired the creation of a TRC in Greensborough, North Carolina, in the United States.

There are no blueprints for solving conflict, though. “But the possibility of something other than criminal trials, something other than war, something other than silence – that’s why the TRC, I think, has been such an exemplar to the world,” she commended.

Court decision cannot rebuild a society, though. Only individuals can forgive. Only individuals can start with purposeful, daily decisions to forgive and forge a common future. Forgiveness is rather like kindness, she suggested. It’s a resource without limits. It’s not scarce like water or money. It’s within our reach. But if it’s forced, it’s not forgiveness.

“It is good,” Prof Minow warned, “to be cautious about the use of law to deliberately shape or manipulate the feelings of any individual. But it is no less important to admit that law does affect human beings, not just in its results, but in its process.” And then we must take responsibility for how we use that law.

“A government can judge, but only people can forgive.” As Prof Minow’s words lingered, the air suddenly seemed a bit more buoyant.

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