About This Project
Recently, tuberculosis was discovered in populations of African black and white rhinoceroses in Kruger National Park (KNP), South Africa. In order to prevent the spread of this deadly disease, movement restrictions have been imposed on rhinoceros in KNP. The aim of this project is to develop new diagnostic tests to determine infection and allow uninfected animals to be moved outside of this endemic area.
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What is the context of this research?
Currently, the largest populations of African rhinoceros exists in protected areas such as KNP. Despite protection, rhinoceros in these areas are still threatened by poaching and disease, such as TB (1,2,3,4). The discovery of TB in these species has lead to imposed movement restrictions from KNP, which hinders conservation efforts to save rhinos by spreading the population. Early discussions with decision-makers in South Africa led to an agreement to develop a plan so that rhinoceros can be tested for TB and those that pass the quarantine and testing program, can be moved. Unfortunately, large knowledge gaps exist how TB gets transmitted to and from rhinos, progression from infection to disease, ecological impact, etc (5). To fill these gaps, reliable diagnostic tools are needed.
What is the significance of this project?
TB results from chronic infection and can lead to fatal disease in people and animals. Animals can carry the bacteria for months and even years before becoming sick. TB can be transmitted between different species of animals (domestic and wildlife) and even between people and animals. Understanding the disease is the first step in preventing further spread to other animals, especially threatened and endangered species such as rhinoceros, lions, wild dogs and African elephants. The loss of apex predators to TB will have detrimental effects on the ecosystem in KNP. This highlights the impact this disease may have in disrupting conservation plans and efforts to maintain biodiversity. New approaches to detect the spread of the disease are urgently needed.
What are the goals of the project?
We will determine the efficacy of blood and sputum diagnostic tools for the diagnosis of TB infection from banked (n = 50) and newly obtained (n = ~50) rhinoceros samples.
This will be achieved by modifying an existing animal blood TB test and using a human TB DNA test. The blood test enable us to measure the animal's immune response, indicating if it has encountered TB before or not. To measure this memory, we will challenge the animal's blood with TB-specific antigens and measure the amount of native rhinoceros immunological messenger molecules secreted by its immune cells. This requires that we purchase specific reagents to capture these molecules for measurement. For the human TB DNA test, we need to purchase the available cartridges able to directly detect TB in respiratory samples.
These costs will enable us to collect the necessary blood and respiratory samples for downstream TB testing. These will also include the cost of correctly shipping the samples to Cape Town from remote areas in South Africa to keep the integrity of the samples intact. In Cape Town, all samples can then be processed accordingly and cultured for Mycobacterial growth.
Due to the scarcity of species specific diagnostic reagents for wildlife such as rhinoceros, some human and animal TB diagnostic tests need to be appropriately adjusted and validated for their use in rhinoceros. The requested amount will contribute towards these largeoptimization costs and will enable our group to design, optimize and validate tests to correctly diagnose TB infected rhinoceros.
The project can officially kick-off beginning September 2018, however the timeline surrounding this project is absolutely dependent on the funds raised. Because this project is a very time sensitive project, we hope to get our diagnostic tools in the hands of wildlife veterinarians and approved laboratories before the end of 2020.
Aug 21, 2018
Dec 31, 2018
Collect blood and respiratory samples from immobilized black and white rhinoceros.
Jun 10, 2019
Mycobacterial culture all respiratory samples collected from the immobilized rhinoceros.
Dec 30, 2019
Use expensive currently available human respiratory TB detection methods (GeneXpert MTB/RIF ULTRA) to determine animal TB status together with culture.
Jun 29, 2020
Optimize the measurement of our identified blood immune markers using a combination of human and animal protein measurement kits.
Meet the Team
Animal TB Research Group at SUN is the only research group in South Africa that has as its SOLE focus, a multifaceted approach to investigating the immunology, epidemiology, pathogenesis and application of research findings to management of tuberculosis in animals (both domestic and wildlife) and at human-animal interfaces. The team exists of our PI: Prof Michele Miller (NRF SA Research Chair), four staff members, 9 postgraduate students and 18 national and international collaborators.
Wynand J. Goosen
From a young age I have always been fascinated with medical research and I have a massive love for all animals. It was only after my bachelors degree I realized that it was possible for me to combine the two. I took a chance and contacted some established researchers in the field of veterinary science and decided to take me under their wings. This was probably the single best thing that ever happened to me in my life. It was here where I got to work with African wild dogs, African buffaloes (1,2,3,4,5,6) , African elephants, African lions (7) and now very importantly African rhinoceros. Since poaching surfaced in South Africa, I pledged my services to combating poaching by playing towards my strengths and that is wildlife disease diagnostics. I am trying to keep our rhinoceros disease free in order for South African veterinarians to safely move these animals to safer areas hidden away from poachers.
Prof Michele A. Miller has a PhD in veterinary Immunology and has worked as a clinical wildlife veterinarian at a number of zoos and as a conservation medicine researcher. She holds the NRF SARChI Chair in Animal Tuberculosis and her current research focus is the immunology, epidemiology, management and control of tuberculosis in animals and those aspects that impact the
human-animal interface. Orcid: 0000-0002-5883-6076
Now a rhino TB threat - The Mercury, 20 Sept 2016 by Tonie Carnie
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