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14 August 2024 | Story Martinette Brits | Photo Supplied
Dr Luther van der Mescht
Dr Luther van der Mescht, Senior Lecturer in the Department of Zoology and Entomology.

Ticks that feed on South Africa’s cattle are developing resistance to the only effective pesticides, making them increasingly difficult to control. If this issue is not addressed, the spread of these parasites and their resistance to pesticides could significantly impact farmers' incomes and food security.

According to a study by Dr Luther van der Mescht, Senior Lecturer in the Department of Zoology and Entomology, many tick populations in South Africa are resistant to at least two of the three main types of acaricides (chemical classes) used in the country.

Dr Van der Mescht notes that with around 12 million cattle in South Africa, these ticks not only lower meat and milk production but also carry pathogens that can cause potentially fatal diseases. He estimates that the economic losses from tick-borne diseases and the use of acaricides could reach up to R670 million annually in the cattle industry alone.

He adds that South Africa's agricultural sector is unique due to its dual farming system, which includes both subsistence and commercial farmers, amplifying the impact of ticks. “The country is also home to a wide variety of tick species that transmit numerous pathogens across a diverse range of habitats and climates in which cattle are farmed. Consequently, the effects of ticks and tick-borne diseases in South Africa may be more severe compared to those in developed countries.”

Dr Van der Mescht highlights that ticks are developing resistance primarily due to poor farm management practices, such as underdosing, overdosing, and excessive use of acaricides. “Additionally, insufficient government support in educating farmers and managing resistance exacerbates the problem.”

Managing acaricide resistance

Dr Van der Mescht explains that while ticks will inevitably develop resistance to acaricides, this usually happens much slower if pesticides are used strategically. To slow the development of resistance, several measures can be implemented: 

• Minimise the number of acaricide treatments.
• Assess tick diversity and acaricide resistance at the farm level and monitor it regularly. The study found that acaricide resistance was highly variable across South Africa, likely due to different farm management practices; hence it should be assessed at the farm level.
• Quarantine animals when transferring them to a new farm, ensuring they are free of ticks before releasing them.
• Rotate acaricides from different chemical classes, with a gap of at least two years between applications.

• Government veterinary services should raise awareness about acaricide resistance and provide support, particularly to under-resourced farmers. Establishing acaricide resistance testing laboratories would help monitor resistance and offer guidance to farmers.

Expert in parasitology

Dr Van der Mescht is particularly fascinated by the fact that most animals on earth follow a parasitic way of life. He graduated with a PhD in Conservation Ecology from the Department of Conservation Ecology and Entomology at Stellenbosch University in 2015, focusing on rodent parasites.

Career highlights include receiving the Wilhelm Neitz Memorial Scholarship in Parasitology from the Parasitological Society of Southern Africa (PARSA) for study abroad, and the Blaustein Centre for Scientific Cooperation Postdoctoral Fellowship in 2016 from Ben-Gurion University of the Negev, Israel, to conduct research on the experimental evolution of host specialisation. He also received the Claude Leon Foundation Postdoctoral Fellowship in 2019 to study the cat flea at Stellenbosch University’s Department of Botany and Zoology.

With over four years of experience in the industry at a contract research organisation, he has conducted more than 40 clinical studies for international pharmaceutical companies and published over 50 peer-reviewed scientific articles.

Making research visible, impactful, and relevant to society

Dr Van der Mescht recently published an article for The Conversation and participated in interviews with eNCA, Newzroom Afrika, and Cape Talk to discuss his research. “This effort aligns with the Vision 130 strategy of being a regionally engaged university and supports one of the key pillars of research development at the University of the Free State (UFS), which is to make our research visible, impactful, and relevant to society.”

He also highlighted the significance of popular science, noting that it helps scientists communicate their research to a broader audience, build their professional reputation, enhance their funding opportunities, and improve their research outcomes.

News Archive

Heart diseases a time bomb in Africa, says UFS expert
2010-05-17

 Prof. Francis Smit

There are a lot of cardiac problems in Africa. Sub-Saharan Africa is home to the largest population of rheumatic heart disease patients in the world and therefore hosts the largest rheumatic heart valve population in the world. They are more than one million, compared to 33 000 in the whole of the industrialised world, says Prof. Francis Smit, Head of the Department of Cardiothoracic Surgery at the Faculty of Health Sciences at the University of the Free State (UFS).

He delivered an inaugural lecture on the topic Cardiothoracic Surgery: Complex simplicity, or simple complexity?

“We are also sitting on a time bomb of ischemic heart disease with the WHO (World Health Organisation) estimating that CAD (coronary artery disease) will become the number-one killer in our region by 2020. HIV/Aids is expected to go down to number 7.”

Very little is done about it. There is neither a clear nor coordinated programme to address this expected epidemic and CAD is regarded as an expensive disease, confined to Caucasians in the industrialised world. “We are ignoring alarming statistics about incidences of adult obesity, diabetes and endemic hypertension in our black population and a rising incidence of coronary artery interventions and incidents in our indigenous population,” Prof. Smit says.

Outside South Africa – with 44 units – very few units (about seven) perform low volumes of basic cardiac surgery. The South African units at all academic institutions are under severe threat and about 70% of cardiac procedures are performed in the private sector.

He says the main challenge in Africa has become sustainability, which needs to be addressed through education. Cardiothoracic surgery must become part of everyday surgery in Africa through alternative education programmes. That will make this specialty relevant at all levels of healthcare and it must be involved in resource allocation to medicine in general and cardiothoracic surgery specifically.

The African surgeon should make the maximum impact at the lowest possible cost to as many people in a society as possible. “Our training in fields like intensive care and insight into pulmonology, gastroenterology and cardiology give us the possibility of expanding our roles in African medicine. We must also remember that we are trained physicians as well.

“Should people die or suffer tremendously while we can train a group of surgical specialists or retraining general surgeons to expand our impact on cardiothoracic disease in Africa using available technology maybe more creatively? We have made great progress in establishing an African School for Cardiothoracic Surgery.”

Prof. Smit also highlighted the role of the annual Hannes Meyer National Registrar Symposium that culminated in having an eight-strong international panel sponsored by the ICC of EACTS to present a scientific course as well as advanced surgical techniques in conjunction with the Hannes Meyer Symposium in 2010.

Prof. Smit says South Africa is fast becoming the driving force in cardiothoracic surgery in Africa. South Africa is the only country that has the knowledge, technology and skills base to act as the springboard for the development of cardiothoracic surgery in Africa.

South Africa, however, is experiencing its own problems. Mortality has doubled in the years from 1997 to 2005 and half the population in the Free State dies between 40 to 44 years of age.

“If we do not need health professionals to determine the quality and quantity of service delivery to the population and do not want to involve them in this process, we can get rid of them, but then the political leaders making that decision must accept responsibility for the clinical outcomes and life expectancies of their fellow citizens.

“We surely cannot expect to impose the same medical legal principles on professionals working in unsafe hospitals and who have complained and made authorities aware of these conditions than upon those working in functional institutions. Either fixes the institutions or indemnifies medical personnel working in these conditions and defends the decision publicly.

“Why do I have to choose the three out of four patients that cannot have a lifesaving operation and will have to die on their own while the system pretends to deliver treatment to all?”

Prof. Smit says developing a service package with guidelines in the public domain will go a long way towards addressing this issue. It is also about time that we have to admit that things are simply not the same. Standards are deteriorating and training outcomes are or will be affected.

The people who make decisions that affect healthcare service delivery and outcomes, the quality of training platforms and research, in a word, the future of South African medicine, firstly need rules and boundaries. He also suggested that maybe the government should develop health policy in the public domain and then outsource healthcare delivery to people who can actually deliver including thousands of experts employed but ignored by the State at present.

“It is time that we all have to accept our responsibilities at all levels… and act decisively on matters that will determine the quality and quantity of medical care for this and future generations in South Africa and Africa. Time is running out,” Prof. Smit says.
 

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