How Overuse of Sub-Standard Disinfectants Could Develop Bacterial Resistance

How Overuse of Sub-Standard Disinfectants Could Develop Bacterial Resistance

COVID-19 has had a significant impact on our lives. One effect that could yet be seen might be the development of bacterial resistance to disinfectants, as a result of the overuse of substandard disinfectants.

SARS-CoV-2 – the virus that causes COVID-19 – is susceptible to most disinfectants, including those containing 70% alcohol. As a result the manufacture and sale of “hand sanitisers” has become big business in the COVID-19 era. Hand sanitising is a key public health intervention and is encouraged in all public spaces. There is, unfortunately, very little control of the quality and efficacy of many of these hand sanitisers. These products are ubiquitous. Many of these “hand sanitisers” are in unlabelled bottles with no traceability.

But the increased use of disinfectants can have an unintended consequence. It could allow for the development of bacterial strains which are resistant to these disinfectants.

A team of the veterinary biotechnology research group at the University of the Free State in South Africa is working to understand the mechanisms of resistance to disinfectants. Our findings suggest that many of the mechanisms that bacteria use to become resistant to antibiotics are also used to develop resistance to disinfectants.

Once this study has been completed, we will have a good understanding of all of the genes involved in resistance to disinfectants in a particular bacterial strain. We hope to discover the mechanisms by which the bacterium has developed such high levels of resistance to certain disinfectants.

Tracking these mechanisms is becoming increasingly important. This is because disinfectants are one of the most viable protections against bacterial disease. (Another is biosecurity – preventing individuals from coming into contact with the pathogen.) Disinfectants could play an increasingly important role in managing bacterial infections in the future if the current trend of antibiotic resistance continues.

Once the mechanisms of resistance are identified, possible solutions can be investigated.

Investigating resistant strains

We set out to identify which microorganisms were resistant to which disinfectants. We took environmental samples and tested the levels of disinfectant resistance.

We started by measuring the levels of resistance in vitro – in a test tube in the laboratory – as well as studying resistance at a molecular level. We isolated a bacterial strain that is highly resistant – up to 100 times more resistant – to all the different disinfectants which have been tested.

We did full genome sequencing of this isolate and compared the genes to closely related isolates. We found a large number of unique genes in this highly resistant strain.

News Source: Science The Wire

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