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31 July 2020 | Story Andre Damons | Photo Supplied
Prof Felicity Burt and Prof Paul Grobler from the UFS.

Three scientists from the University of the Free State (UFS), together with authors from other institutions, are part of an international COVID-19 study published in an international peer-reviewed scientific journal recently. 

Prof Paul Grobler, Academic Head of Department: Genetics; Prof Felicity Burt, researcher from the Division of Virology, Faculty of Health Sciences and the NHLS, and SARChI (South African Research Chairs Initiative) Research Chair in vector-borne and zoonotic diseases; as well as Prof Trudy Turner from the University of Wisconsin-Milwauwkee, but also an affiliated professor in the Department of Genetics at the UFS, are co-authors of the paper that appeared in Plos One. The study is titled: ACE2 and TMPRSS2 variation in savanna monkeys (Chlorocebus spp.): Potential risk for zoonotic/anthroponotic transmission of SARS-CoV-2 and a potential model for functional studies.

 The paper follows an initiative of Prof Chris Schmitt at Boston University with researchers affiliated to the University of California, Los Angeles, Rutgers University, the Polish Academy of Sciences, the Ministry of Health of the Russian Federation, the University of Antwerp, the Wake Forest School of Medicine, and the University of Wisconsin-Milwaukee. The team used the opportunity presented by previously sequenced genomes to screen for variation in the genes associated with susceptibility to infection with SARS-CoV-2.

Concerns about animal welfare and conservation issues

Prof Grobler, who has been studying vervet monkeys from a conservation perspective for two decades, says considering the impact of COVID-19 on the country, he feels that any aspect that might potentially help to understand the progression and transmission of the disease, as well as unexpected risks – however small – should be investigated. 
“Since wildlife management is my field, I am of course also concerned about the potential animal welfare and conservation issues involved.  It should, however, be emphasised that while SARS-CoV-2 infection in vervet monkeys has now been shown to be genetically possible, there is no proof of it actually happening in the wild yet.” 

“I am sure that much work on COVID-19 and vervets will follow internationally, but this is the first study to describe variation at the genes linked to susceptibility,” says Prof Grobler. 

Because of his previous work with vervet monkeys in South Africa and further afield, Prof Grobler was invited by Prof Schmitt to contribute to the manuscript.

“I made some suggestions from a conservation perspective, based on my interpretations and also recent international work that have shown that many primate species may be at risk for SARS-CoV-2 infection and are potentially vulnerable to COVID-19. I also felt that some aspects of the paper would be greatly improved with input from a South African expert in zoonotic disease to add to the genetic and conservation perspectives, and I therefore requested that Prof Burt also be approached.”

Potential for non-human primates infection

Prof Burt, whose research interests and expertise include the investigation of viruses of zoonotic origin, and/or those transmitted by mosquitoes and ticks that impact human and/or animal well-being – using a One Health approach – says the study was a collaborative effort between scientists with expertise in a wide range of disciplines, including biological anthropology, genetics, primatology, molecular biology, and virology.

“The concept of One Health encourages collaboration between multiple disciplines, promoting the concept that the interaction between humans, animals, and the environment has an impact on the health of people, animals, plants, and the environment. The outcome is an exciting study that incorporates knowledge from each discipline to investigate the potential susceptibility of non-human primate populations to SARS-CoV-2.” 

“The research suggests that there is potential for novel SARS-CoV-2 to infect non-human primates, and that surveillance of non-human primates living in close proximity to human populations is not only warranted, but is actually important for defining risk to both humans and animals,” says Prof Burt. 

According to her, the majority of recently emerged viruses, including SARS-CoV-2, were zoonotic in origin. The close proximity of humans and wild non-human primates provides potential for cross-species transmission of pathogens; for some endangered species, this could have devastating effects. Similarly, identifying if non-human primates have the potential to act as intermediate hosts for pathogens with significant public health implications, would be important for understanding zoonotic transmission.

“Novel viruses are continually emerging, and we need to be prepared. A multidisciplinary approach to understanding interactions at the wildlife-human interface will be essential for the prevention of future outbreaks.”

News Archive

Is milk really so well-known, asks UFS’s Prof. Osthoff
2011-03-17

Prof. Garry Osthoff
Photo: Stephen Collett

Prof. Garry Osthoff opened a whole new world of milk to the audience in his inaugural lecture, Milk: the well-known (?) food, in our Department of Microbial, Biochemical and Food Biotechnology of the Faculty of Natural and Agricultural Sciences.

Prof. Osthoff has done his research in protein chemistry, immuno-chemistry and enzymology at the Council for Scientific and Industrial Research (CSIR) in Pretoria and post-doctoral research at the Bowman-Grey School of Medicine, North Carolina, USA. That was instrumental in establishing food chemistry at the university.
 
He is involved in chemical aspects of food, with a focus on dairy science and technology. He is also involved in the research of cheese processing as well as milk evolution and concentrated on milk evolution in his lecture. Knowledge of milk from dairy animals alone does not provide all the explanations of milk as food.
 
Some aspects he highlighted in his lecture were that milk is the first food to be utilised by young mammals and that it is custom-designed for each species. “However, mankind is an opportunist and has found ways of easy access to food by the practice of agriculture, where plants as well as animals were employed or rather exploited,” he said.
 
The cow is the best-known milk producer, but environmental conditions forced man to select other animals. In spite of breeding selection, cattle seem not to have adapted to the most extreme conditions such as high altitudes with sub-freezing temperatures, deserts and marshes.
 
Prof. Osthoff said the consumption of the milk as an adult is not natural; neither is the consumption of milk across species. This practice of mankind may often have consequences, when signs of malnutrition or diseases are noticed. Two common problems are an allergy to milk and lactose intolerance.
 
Allergies are normally the result of an immune response of the consumer to the foreign proteins found in the milk. In some cases it might help to switch from one milk source to another, such as switching from cow’s milk to goat’s milk.
 
Prof. Osthoff said lactose intolerance – the inability of adult humans to digest lactose, the milk sugar – is natural, as adults lose that ability to digest lactose. The symptoms of the condition are stomach cramps and diarrhoea. This problem is mainly found in the warmer climates of the world. This could be an indication of early passive development of dairy technology. In these regions milk could not be stored in its fresh form, but in a fermented form, in which case the lactose was pre-digested by micro-organisms, and the human population never adapted to digesting lactose in adulthood.
 
According to Prof. Osthoff, it is basically the lactose in milk that has spurred dairy technology. Its fermentation has resulted in the development of yoghurts and all the cheeses that we know. In turn, the intolerance to lactose has spurred a further technological solution: lactose-free milk is currently produced by pre-digestion of lactose with enzymes.
 
It was realised that the milks and products from different species differed in quality aspects such as keeping properties and taste. It was also realised that the nutritional properties differed as well as their effects on health. One example is the mentioned allergy against cow’s milk proteins, which may be solved by the consumption of goat’s milk. The nutritional benefits and technological processing of milk aroused an interest in more information, and it was realised that the information gained from human milk and that of the few domesticated species do not provide a complete explanation of the properties of milk as food. Of the 250 species of milk which have been studied, only the milk of humans and a few domesticated dairy animals has been studied in detail.

Media Release
15 March 2011
Issued by: Lacea Loader
Director: Strategic Communication
Tel: 051 401 2584
Cell: 083 645 2454
E-mail: news@ufs.ac.za

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