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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

Inaugural lecture: Prof Robert Bragg, Dept. of Microbial, Biochemical and Food Biotechnology
2006-05-17



Attending the inaugural lecture were in front from the left Prof Robert Bragg (lecturer at the Department of Microbial, Biochemical and Food Biotechnology) and Frederick Fourie (Rector and Vice-Chancellor).  At the back from the left were Prof James du Preez (Departmental Chairperson:  Department of Microbial, Biochemical and Food Biotechnology) and Prof Herman van Schalkwyk (Dean: Faculty of Natural and Agricultural Sciences). Photo: Stephen Collett
 

A summary of an inaugural lecture delivered by Prof Robert Bragg at the University of the Free State:

CONTROL OF INFECTIOUS AVIAN DISEASES – LESSONS FOR MAN?

Prof Robert R Bragg
Department of Microbial, Biochemical and Food Biotechnology
University of the Free State

“Many of the lessons learnt in disease control in poultry will have application on human medicine,” said Prof Robert Bragg, lecturer at the University of the Free State’s (UFS) Department of Microbial, Biochemical and Food Biotechnology during his inaugural lecture.

Prof Bragg said the development of vaccines remains the main stay of disease control in humans as well as in avian species.  Disease control can not rely on vaccination alone and other disease-control options must be examined.  

“With the increasing problems of antibiotic resistance, the use of disinfection and bio security are becoming more important,” he said.

“Avian influenza (AI) is an example of a disease which can spread from birds to humans.  Hopefully this virus will not develop human to human transmission,” said Prof Bragg.

According to Prof Bragg, South Africa is not on the migration route of water birds, which are the main transmitters of AI.  “This makes South Africa one of the countries less likely to get the disease,” he said.

If the AI virus does develop human to human transmission, it could make the 1918 flu pandemic pale into insignificance.  During the 1918 flu pandemic, the virus had a mortality rate of only 3%, yet more than 50 million people died.

Although the AI virus has not developed human-to-human transmission, all human cases have been related to direct contact with infected birds. The mortality rate in humans who have contracted this virus is 67%.

“Apart from the obvious fears for the human population, this virus is a very serious poultry pathogen and can cause 100% mortality in poultry populations.  Poultry meat and egg production is the staple protein source in most countries around the world. The virus is currently devastating the poultry industry world-wide,” said Prof Bragg.

Prof Bragg’s research activities on avian diseases started off with the investigation of diseases in poultry.  “The average life cycle of a broiler chicken is 42 days.  After this short time, they are slaughtered.  As a result of the short generation time in poultry, one can observe changes in microbial populations as a result of the use of vaccines, antibiotics and disinfectants,” said Prof Bragg.   

“Much of my research effort has been directed towards the control of infectious coryza in layers, which is caused by the bacterium Avibacterium paragallinarum.  This disease is a type of sinusitis in the layer chickens and can cause a drop in egg product of up to 40%,” said Prof Bragg.

The vaccines used around the world in an attempt to control this disease are all inactivated vaccines. One of the most important points is the selection of the correct strains of the bacterium to use in the vaccine.

Prof Bragg established that in South Africa, there are four different serovars of the bacterium and one of these, the serovar C-3 strain, was believed to be unique to Southern Africa. He also recently discovered this serovar for the first time in Israel, thus indicating that this serovar might have a wider distribution than originally believed.

Vaccines used in this country did not contain this serovar.  Prof Bragg established that the long term use of vaccines not containing the local South African strain resulted in a shift in the population distribution of the pathogen.

Prof Bragg’s research activities also include disease control in parrots and pigeons.   “One of the main research projects in my group is on the disease in parrots caused by the circovirus Beak and Feather Disease virus. This virus causes serious problems in the parrot breeding industry in this country. This virus is also threatening the highly endangered and endemic Cape Parrot,” said Prof Bragg.

Prof Bragg’s research group is currently working on the development of a DNA vaccine which will assist in the control of the disease, not only in the parrot breeding industry, but also to help the highly endangered Cape Parrot in its battle for survival.

“Not all of our research efforts are directed towards infectious coryza or the Beak and Feather Disease virus.  One of my Masters students is currently investigating the cell receptors involved in the binding of Newcastle Disease virus to cancerous cells and normal cells of humans. This work will also eventually lead to a possible treatment of cancer in humans and will assist with the development of a recombinant vaccine for Newcastle disease virus,” said Prof Bragg.

We are also currently investigating an “unknown” virus which causes disease problems in poultry in the Western Cape,” said Prof Bragg.
 
“Although disinfection has been extensively used in the poultry industry, it has only been done at the pre-placement stage. In other words, disinfectants are used before the birds are placed into the house. Once the birds are placed, all use of disinfectants stops,” said Prof Bragg.

“Disinfection and bio security can be seen as the ‘Cinderella’ of disease control in poultry.  This is also true for human medicine. One just has to look at the high numbers of people who die from hospital-acquired infections to realise that disinfection is not a concept which is really clear in human health care,” said Prof Bragg.

Much research has been done in the control of diseases through vaccination and through the use of antibiotics. “These pillars of disease control are, however, starting to crumble and more effort is needed on disinfection and bio security,” said Prof Bragg.

Prof Bragg has been working in close co-operation with a chemical manufacturing company in Stellenbosch to develop a unique disinfectant which his highly effective yet not toxic to the birds.

As a result of this unique product, he has developed the continual disinfection program for use in poultry. In this program the disinfectant is used throughout the production cycle of the birds. It is also used to ensure that there is excellent pre-placement disinfection.

“The program is extensively used for the control of infectious diseases in the parrot-breeding industry in South Africa and the product has been registered in 15 countries around the world with registration in the USA in the final process,” said Prof Bragg.

“Although the problem of plasmid mediated resistance to disinfectants is starting to rear its ugly head, this has allowed for the opening of a new research field which my group will hopefully exploit in the near future,” he said.

 

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