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Mahony TJ, Briody TE, Ommeh SC. Can the Revolution in mRNA-Based Vaccine Technologies Solve the Intractable Health Issues of Current Ruminant Production Systems? Vaccines (Basel) 2024; 12:152. [PMID: 38400135 PMCID: PMC10893269 DOI: 10.3390/vaccines12020152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/23/2024] [Accepted: 01/29/2024] [Indexed: 02/25/2024] Open
Abstract
To achieve the World Health Organization's global Sustainable Development Goals, increased production of high-quality protein for human consumption is required while minimizing, ideally reducing, environmental impacts. One way to achieve these goals is to address losses within current livestock production systems. Infectious diseases are key limiters of edible protein production, affecting both quantity and quality. In addition, some of these diseases are zoonotic threats and potential contributors to the emergence of antimicrobial resistance. Vaccination has proven to be highly successful in controlling and even eliminating several livestock diseases of economic importance. However, many livestock diseases, both existing and emerging, have proven to be recalcitrant targets for conventional vaccination technologies. The threat posed by the COVID-19 pandemic resulted in unprecedented global investment in vaccine technologies to accelerate the development of safe and efficacious vaccines. While several vaccination platforms emerged as front runners to meet this challenge, the clear winner is mRNA-based vaccination. The challenge now is for livestock industries and relevant stakeholders to harness these rapid advances in vaccination to address key diseases affecting livestock production. This review examines the key features of mRNA vaccines, as this technology has the potential to control infectious diseases of importance to livestock production that have proven otherwise difficult to control using conventional approaches. This review focuses on the challenging diseases of ruminants due to their importance in global protein production. Overall, the current literature suggests that, while mRNA vaccines have the potential to address challenges in veterinary medicine, further developments are likely to be required for this promise to be realized for ruminant and other livestock species.
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Affiliation(s)
- Timothy J. Mahony
- Centre for Animal Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD 4072, Australia; (T.E.B.); (S.C.O.)
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Surve AA, Hwang JY, Manian S, Onono JO, Yoder J. Economics of East Coast fever: a literature review. Front Vet Sci 2023; 10:1239110. [PMID: 37771945 PMCID: PMC10526366 DOI: 10.3389/fvets.2023.1239110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 08/22/2023] [Indexed: 09/30/2023] Open
Abstract
East Coast fever (ECF) is a cattle disease caused by a protozoan parasite called Theileria parva (T. parva). Theileria parva is transmitted among cattle by ticks. It is endemic in parts of central, eastern, and southern Africa and imposes an economic burden through illness and death of approximately a half of a billion U.S. dollars annually. This paper reviews existing science on the economics of ECF. We utilize a conceptual model that defines primary categories of economic costs due to ECF and use it to organize a synthesis of the literature on aggregate and micro level direct costs of the disease and the costs and benefits related to various ECF management strategies. We then identify knowledge gaps to motivate for future research.
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Affiliation(s)
- Aditi A. Surve
- School of Economic Sciences, Washington State University, Pullman, WA, United States
| | - Jae Young Hwang
- School of Economic Sciences, Washington State University, Pullman, WA, United States
| | - Shanthi Manian
- School of Economic Sciences, Washington State University, Pullman, WA, United States
- School for Global Health, Washington State University, Pullman, WA, United States
| | - Joshua Orungo Onono
- Department of Public Health Pharmacology and Toxicology, University of Nairobi, Nairobi, Kenya
| | - Jonathan Yoder
- School of Economic Sciences, Washington State University, Pullman, WA, United States
- School for Global Health, Washington State University, Pullman, WA, United States
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3
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Bessell PR, Salmon G, Schnier C, Tjasink K, Al-Riyami L, Peters A. A high level estimation of the net economic benefits to small-scale livestock producers arising from animal health product distribution initiatives. Front Vet Sci 2023; 10:1171989. [PMID: 37346278 PMCID: PMC10279859 DOI: 10.3389/fvets.2023.1171989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/11/2023] [Indexed: 06/23/2023] Open
Abstract
Introduction A fundamental challenge for charities that facilitate distribution of animal health products to small-scale livestock producers (SSPs) in low and middle income countries (LMICs) is identifying the products and market mechanisms that provide the greatest positive impact for SSPs and estimating their associated impact. This paper describes a pragmatic approach to modeling the impact of market-led product distribution initiatives based on estimating the net economic benefit of administration of animal health products. Methods The model estimates the economic impact of diseases at the individual animal level for poultry, small ruminants, and cattle. The economic impact of mortality and growth inhibition associated with disease are then estimated in conjunction with the losses averted or recovered by preventing or treating the disease. Economic benefit is estimated in 2014-2017 values and also adjusted to 2023 values. The flexible model structure allows for addition of new geographies, new products, and increased granularity of modeled production systems. Results Applied to the Global Alliance for Livestock Veterinary Medicines (GALVmed) product distribution initiatives conducted in Africa and South Asia (SA) between 2014 and 2017, the model estimates an adjusted total net economic benefit of 139.9 million USD from sales of vaccines and poultry anthelminthics in these initiatives. Within SSA, the greatest net economic benefit was realized from East Coast fever and Newcastle disease vaccines, while in SA, peste des petits ruminants and Newcastle disease vaccines had the greatest net economic benefits. This translated to an adjusted $37.97 of net economic benefit on average per SSP customer, many of whom were small poultry producers. Discussion While the model currently estimates impacts from mortality and growth inhibition in livestock, there is the potential to extend it to cover impacts of further initiatives, including interventions targeted at diseases that impact production of milk, eggs, and reproduction.
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Affiliation(s)
| | - Gareth Salmon
- SEBI-L Supporting Evidence Based Interventions in Livestock, University of Edinburgh, Edinburgh, United Kingdom
| | - Christian Schnier
- SEBI-L Supporting Evidence Based Interventions in Livestock, University of Edinburgh, Edinburgh, United Kingdom
| | - Katharine Tjasink
- Global Alliance for Livestock Veterinary Medicines (GALVmed), Edinburgh, United Kingdom
| | - Lamyaa Al-Riyami
- Global Alliance for Livestock Veterinary Medicines (GALVmed), Edinburgh, United Kingdom
| | - Andrew Peters
- SEBI-L Supporting Evidence Based Interventions in Livestock, University of Edinburgh, Edinburgh, United Kingdom
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4
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Lacasta A, Kim HC, Kepl E, Gachogo R, Chege N, Ojuok R, Muriuki C, Mwalimu S, Touboul G, Stiber A, Poole EJ, Ndiwa N, Fiala B, King NP, Nene V. Design and immunological evaluation of two-component protein nanoparticle vaccines for East Coast fever. Front Immunol 2023; 13:1015840. [PMID: 36713406 PMCID: PMC9880323 DOI: 10.3389/fimmu.2022.1015840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 12/22/2022] [Indexed: 01/14/2023] Open
Abstract
Nanoparticle vaccines usually prime stronger immune responses than soluble antigens. Within this class of subunit vaccines, the recent development of computationally designed self-assembling two-component protein nanoparticle scaffolds provides a powerful and versatile platform for displaying multiple copies of one or more antigens. Here we report the generation of three different nanoparticle immunogens displaying 60 copies of p67C, an 80 amino acid polypeptide from a candidate vaccine antigen of Theileria parva, and their immunogenicity in cattle. p67C is a truncation of p67, the major surface protein of the sporozoite stage of T. parva, an apicomplexan parasite that causes an often-fatal bovine disease called East Coast fever (ECF) in sub-Saharan Africa. Compared to I32-19 and I32-28, we found that I53-50 nanoparticle scaffolds displaying p67C had the best biophysical characteristics. p67C-I53-50 also outperformed the other two nanoparticles in stimulating p67C-specific IgG1 and IgG2 antibodies and CD4+ T-cell responses, as well as sporozoite neutralizing capacity. In experimental cattle vaccine trials, p67C-I53-50 induced significant immunity to ECF, suggesting that the I53-50 scaffold is a promising candidate for developing novel nanoparticle vaccines. To our knowledge this is the first application of computationally designed nanoparticles to the development of livestock vaccines.
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Affiliation(s)
- Anna Lacasta
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya,*Correspondence: Anna Lacasta, ; Neil P. King,
| | - Hyung Chan Kim
- Department of Biochemistry, University of Washington, Seattle, WA, United States,Institute for Protein Design, University of Washington, Seattle, WA, United States
| | - Elizabeth Kepl
- Department of Biochemistry, University of Washington, Seattle, WA, United States,Institute for Protein Design, University of Washington, Seattle, WA, United States
| | - Rachael Gachogo
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Naomi Chege
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Rose Ojuok
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Charity Muriuki
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Stephen Mwalimu
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Gilad Touboul
- Department of Biochemistry, University of Washington, Seattle, WA, United States,Institute for Protein Design, University of Washington, Seattle, WA, United States
| | - Ariel Stiber
- Summer Undergraduate Research Fellowship Program, Caltech, Pasadena, CA, United States
| | - Elizabeth Jane Poole
- Research Methods Group, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Nicholas Ndiwa
- Research Methods Group, International Livestock Research Institute (ILRI), Nairobi, Kenya
| | - Brooke Fiala
- Department of Biochemistry, University of Washington, Seattle, WA, United States,Institute for Protein Design, University of Washington, Seattle, WA, United States
| | - Neil P. King
- Department of Biochemistry, University of Washington, Seattle, WA, United States,Institute for Protein Design, University of Washington, Seattle, WA, United States,*Correspondence: Anna Lacasta, ; Neil P. King,
| | - Vishvanath Nene
- Animal and Human Health program, International Livestock Research Institute (ILRI), Nairobi, Kenya
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5
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Yang TS, Reichard MV, Thomas JE, Miller LS, Marr HS, Karounos M, Bell AJ, Birkenheuer AJ. Cytauxzoon felis in salivary glands of Amblyomma americanum. Ticks Tick Borne Dis 2023; 14:102056. [PMID: 36399958 PMCID: PMC10698755 DOI: 10.1016/j.ttbdis.2022.102056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 10/10/2022] [Accepted: 10/12/2022] [Indexed: 11/06/2022]
Abstract
Cytauxzoon felis is a tick-borne piroplasmid hemoparasite that causes life-threatening disease in cats. Despite the critical role that ticks play in pathogen transmission, our knowledge regarding the C. felis life cycle remains limited to the feline hosts. Specific life stages of C. felis within the tick host have never been visualized microscopically and previous investigations have been limited to molecular detection by polymerase chain reaction (PCR). Sporozoites are the infectious stage of piroplasmids that are transmitted by ticks. In other tick-borne piroplasmids, sporozoite-based vaccines play a key role in disease prevention and management. We believe sporozoites have similar potential for cytauxzoonosis. Therefore, the objective of this study was to use different molecular and microscopic techniques to detect and evaluate C. felis sporozoites in tick salivary glands (SG). A total of 140 Amblyomma americanum adults that were fed on C. felis-infected cats as nymphs were included for this study. Specifically, dissected SGs were quartered and subjected to C. felis RT-PCR, RNAscope® in situ hybridization (ISH), histology, direct azure staining, and transmission electron microscopy (TEM). Cytauxzoon felis RT-PCR was also performed on half tick (HT) carcasses after SG dissection. Cytauxzoon felis RNA was detected in SGs of 17/140 ticks. Of these, 7/17 ticks had microscopic visualization via ISH and/or TEM. The remaining 10/17 ticks had only molecular detection of C. felis in SGs via RT-PCR without visualization. Cytauxzoon felis RNA was detected solely in HT carcasses via RT-PCR in 9/140 ticks. In ISH-positive tick SGs, hybridization signals were present in cytoplasms of SG acinar cells. TEM captured rare C. felis organisms with characteristic ultrastructural features of sporozoites. This study describes the first direct visualization of any developing stage of C. felis in ticks. Forthcoming studies should employ a combination of molecular and microscopic techniques to investigate the C. felis life cycle in A. americanum.
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Affiliation(s)
- Tzushan S Yang
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Mason V Reichard
- Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA
| | - Jennifer E Thomas
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA
| | - Laura S Miller
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Henry S Marr
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Michael Karounos
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Aaron J Bell
- Analytical Instrumentation Facility, North Carolina State University, Raleigh, NC 27695, USA
| | - Adam J Birkenheuer
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA.
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6
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Teufel N, Korir L, Hammond J, van Wijk M, Kiara H. Farm and Livelihood Characteristics After ITM Vaccination Against East Coast Fever in Tanzania. Front Vet Sci 2021; 8:639762. [PMID: 34859079 PMCID: PMC8632140 DOI: 10.3389/fvets.2021.639762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 07/12/2021] [Indexed: 11/30/2022] Open
Abstract
East Coast Fever is a critical cattle disease in East and Southern Africa which is currently mainly controlled through frequent chemical removal of ticks, the disease vector. However, a vaccine conveying life-long immunity has existed for some time, known as the infection and treatment method (ITM), although it has so far not been widely adopted because of its cost, demanding distribution system and regulatory reservations. Also, despite having proved effective on the animal level, the promoters of the vaccine have not been able to show much evidence of its benefits on the herd, farm and household levels. This study, based on a cross-sectional survey of 994 cattle keepers throughout Tanzania, aims to provide such evidence by comparing indicators of herd productivity, of farm management and success as well as of household livelihoods between households that have adopted the ITM vaccine for some years with those that have only recently adopted it. Econometric models identify the contribution of ITM adoption to indicator values together with various other determining factors amongst 277 long-term adopters of ITM and the control group of 118 recent adopters as well as 118 matched farmers without access to ITM. The results confirm that ITM adoption is positively associated with all three indicators of herd-productivity considered in this study. However, it does not support any of the three indicators of farm management and only one out of four indicators representing farm success. Nevertheless, the adoption of ITM shows a positive association with all four indicators of household livelihood. Investigating the chain of intermediate outcomes, indicators of herd productivity, such as milk yield, are significantly linked to higher feed expenses, contributing to increased livestock productivity and ultimately income and food availability. Overall, these results therefore support the promotion of ITM as a beneficial technology for the sustainable development of rural livestock keepers.
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Affiliation(s)
- Nils Teufel
- Policies, Institutions and Livelihoods, International Livestock Research Institute, Nairobi, Kenya
| | - Luke Korir
- Policies, Institutions and Livelihoods, International Livestock Research Institute, Nairobi, Kenya
| | - James Hammond
- Sustainable Livestock Systems, International Livestock Research Institute, Nairobi, Kenya
| | - Mark van Wijk
- Sustainable Livestock Systems, International Livestock Research Institute, Nairobi, Kenya
| | - Henry Kiara
- Animal and Human Health, International Livestock Research Institute, Nairobi, Kenya
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7
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Allan FK, Peters AR. Safety and Efficacy of the East Coast Fever Muguga Cocktail Vaccine: A Systematic Review. Vaccines (Basel) 2021; 9:vaccines9111318. [PMID: 34835249 PMCID: PMC8623010 DOI: 10.3390/vaccines9111318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/27/2021] [Accepted: 10/29/2021] [Indexed: 12/04/2022] Open
Abstract
Immunisation of livestock with high quality vaccines is considered an essential approach to controlling many animal diseases. The only currently available commercial vaccine to protect cattle from East Coast fever (ECF), a tick-borne disease caused by Theileria parva, is an unconventional “infection and treatment method” (ITM) involving administration of a combination of live T. parva isolates, referred to as the “Muguga cocktail”, and simultaneous treatment with long-acting oxytetracycline. Veterinary vaccine research and development typically involves studies designed to demonstrate vaccine quality, safety, and efficacy; however, as there were no such purpose-designed registration studies conducted for the Muguga cocktail, evidence for safety and efficacy is solely based on that which is available in the clinical literature. An extensive systematic review was conducted to analyse the evidence available in the literature in order to establish the safety and efficacy of the Muguga cocktail vaccine. A combination of meta-analyses and narrative summaries was conducted. A total of 61 studies met the criteria to be included in the systematic review. The majority of studies demonstrated or reported in favour of the vaccine with regards to safety and efficacy of the Muguga cocktail vaccine. Proximity to buffalo often resulted in reduced vaccine efficacy, and reports of shed and transmission of vaccine components affected the overall interpretation of safety. Better understanding of control options for this devastating livestock disease is important for policymakers and livestock keepers, enabling them to make informed decisions with regards to the health of their animals and their livelihoods.
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Goh S, Kolakowski J, Holder A, Pfuhl M, Ngugi D, Ballingall K, Tombacz K, Werling D. Development of a Potential Yeast-Based Vaccine Platform for Theileria parva Infection in Cattle. Front Immunol 2021; 12:674484. [PMID: 34305904 PMCID: PMC8297500 DOI: 10.3389/fimmu.2021.674484] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 06/10/2021] [Indexed: 01/05/2023] Open
Abstract
East Coast Fever (ECF), caused by the tick-borne apicomplexan parasite Theileria parva, remains one of the most important livestock diseases in sub-Saharan Africa with more than 1 million cattle dying from infection every year. Disease prevention relies on the so-called "Infection and Treatment Method" (ITM), which is costly, complex, laborious, difficult to standardise on a commercial scale and results in a parasite strain-specific, MHC class I-restricted cytotoxic T cell response. We therefore attempted to develop a safe, affordable, stable, orally applicable and potent subunit vaccine for ECF using five different T. parva schizont antigens (Tp1, Tp2, Tp9, Tp10 and N36) and Saccharomyces cerevisiae as an expression platform. Full-length Tp2 and Tp9 as well as fragments of Tp1 were successfully expressed on the surface of S. cerevisiae. In vitro analyses highlighted that recombinant yeast expressing Tp2 can elicit IFNγ responses using PBMCs from ITM-immunized calves, while Tp2 and Tp9 induced IFNγ responses from enriched bovine CD8+ T cells. A subsequent in vivo study showed that oral administration of heat-inactivated, freeze-dried yeast stably expressing Tp2 increased total murine serum IgG over time, but more importantly, induced Tp2-specific serum IgG antibodies in individual mice compared to the control group. While these results will require subsequent experiments to verify induction of protection in neonatal calves, our data indicates that oral application of yeast expressing Theileria antigens could provide an affordable and easy vaccination platform for sub-Saharan Africa. Evaluation of antigen-specific cellular immune responses, especially cytotoxic CD8+ T cell immunity in cattle will further contribute to the development of a yeast-based vaccine for ECF.
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Affiliation(s)
- Shan Goh
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
| | - Jeannine Kolakowski
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
| | - Angela Holder
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
| | - Mark Pfuhl
- Faculty of Life Science and Medicine, King's College London, London, United Kingdom
| | - Daniel Ngugi
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
| | | | - Kata Tombacz
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
| | - Dirk Werling
- Department of Pathobiology and Population Sciences, Royal Veterinary College, Hatfield, United Kingdom
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Lacasta A, Mody KT, De Goeyse I, Yu C, Zhang J, Nyagwange J, Mwalimu S, Awino E, Saya R, Njoroge T, Muriuki R, Ndiwa N, Poole EJ, Zhang B, Cavallaro A, Mahony TJ, Steinaa L, Mitter N, Nene V. Synergistic Effect of Two Nanotechnologies Enhances the Protective Capacity of the Theileria parva Sporozoite p67C Antigen in Cattle. THE JOURNAL OF IMMUNOLOGY 2021; 206:686-699. [PMID: 33419770 PMCID: PMC7851744 DOI: 10.4049/jimmunol.2000442] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 12/03/2020] [Indexed: 11/19/2022]
Abstract
East Coast fever (ECF), caused by Theileria parva, is the most important tick-borne disease of cattle in sub-Saharan Africa. Practical disadvantages associated with the currently used live-parasite vaccine could be overcome by subunit vaccines. An 80-aa polypeptide derived from the C-terminal portion of p67, a sporozoite surface Ag and target of neutralizing Abs, was the focus of the efforts on subunit vaccines against ECF and subjected to several vaccine trials with very promising results. However, the vaccination regimen was far from optimized, involving three inoculations of 450 μg of soluble p67C (s-p67C) Ag formulated in the Seppic adjuvant Montanide ISA 206 VG. Hence, an improved formulation of this polypeptide Ag is needed. In this study, we report on two nanotechnologies that enhance the bovine immune responses to p67C. Individually, HBcAg-p67C (chimeric hepatitis B core Ag virus-like particles displaying p67C) and silica vesicle (SV)-p67C (s-p67C adsorbed to SV-140-C18, octadecyl-modified SVs) adjuvanted with ISA 206 VG primed strong Ab and T cell responses to p67C in cattle, respectively. Coimmunization of cattle (Bos taurus) with HBcAg-p67C and SV-p67C resulted in stimulation of both high Ab titers and CD4 T cell response to p67C, leading to the highest subunit vaccine efficacy we have achieved to date with the p67C immunogen. These results offer the much-needed research depth on the innovative platforms for developing effective novel protein-based bovine vaccines to further the advancement.
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Affiliation(s)
- Anna Lacasta
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya;
| | - Karishma T Mody
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ine De Goeyse
- Enzootic, Vector-borne and Bee Diseases, Sciensano, 1180 Brussels, Belgium.,Department of Biomedical Sciences, Institute of Tropical Medicine, 2000 Antwerp, Belgium
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Jun Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - James Nyagwange
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Stephen Mwalimu
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Elias Awino
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Rosemary Saya
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Thomas Njoroge
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Robert Muriuki
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Nicholas Ndiwa
- Research Methods Group, International Livestock Research Institute, Nairobi 00100, Kenya; and
| | - Elisabeth Jane Poole
- Research Methods Group, International Livestock Research Institute, Nairobi 00100, Kenya; and
| | - Bing Zhang
- Department of Agriculture and Fisheries, Brisbane, Queensland 4102, Australia
| | - Antonino Cavallaro
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Timothy J Mahony
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Lucilla Steinaa
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Vishvanath Nene
- Animal and Human Health Program, International Livestock Research Institute, Nairobi 00100, Kenya
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Evaluating farm-level livestock interventions in low-income countries: a scoping review of what works, how, and why. Anim Health Res Rev 2020; 21:108-121. [PMID: 33261710 DOI: 10.1017/s1466252320000146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Livestock interventions can improve nutrition, health, and economic well-being of communities. The objectives of this review were to identify and characterize livestock interventions in developing countries and to assess their effectiveness in achieving development outcomes. A scoping review, guided by a search strategy, was conducted. Papers needed to be written in English, published in peer-reviewed journals, and describe interventions in animal health and production. Out of 2739 publications systematically screened at the title, abstract, and full publication levels, 70 met our inclusion criteria and were considered in the study. Eight relatively high-quality papers were identified and added, resulting in 78 reviewed publications. Only 15 studies used randomized controlled trial designs making it possible to confidently link interventions with the resulting outcomes. Eight studies had human nutrition or health as outcomes, 11 focused on disease control, and four were on livestock production. Eight interventions were considered successful, but only four were scalable. We found good evidence that livestock-transfer programs, leveraging livestock products for nutrition, and helping farmers manage priority diseases, can improve human well-being. Our report highlights challenges in garnering evidence for livestock interventions in developing countries and provides suggestions on how to improve the quantity and quality of future evaluations.
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11
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An alternative cold chain for storing and transporting East Coast fever vaccine. Vet Parasitol 2020; 288:109304. [PMID: 33161281 DOI: 10.1016/j.vetpar.2020.109304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 10/31/2020] [Accepted: 11/01/2020] [Indexed: 11/22/2022]
Abstract
East Coast fever (ECF) is an often fatal, economically important cattle disease that predominantly affects eastern, central, and southern Africa. ECF is controlled through vaccination by means of simultaneous injection of oxytetracycline and cryogenically preserved stabilate containing live, disease-causing parasites. Storage and transportation of the stabilate requires liquid nitrogen, a commodity that is commonly unreliable in low-resource settings. Here we show that storage of conventionally prepared stabilate at -80 °C for up to 30 days does not significantly affect its ability to infect cultured peripheral blood mononucleated cells or live cattle, suggesting an alternative cold chain that maintains these temperatures could be used to effectively manage ECF.
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Atuhaire DK, Muleya W, Mbao V, Bazarusanga T, Gafarasi I, Salt J, Namangala B, Musoke AJ. Sequence diversity of cytotoxic T cell antigens and satellite marker analysis of Theileria parva informs the immunization against East Coast fever in Rwanda. Parasit Vectors 2020; 13:452. [PMID: 32894166 PMCID: PMC7487574 DOI: 10.1186/s13071-020-04322-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 08/30/2020] [Indexed: 11/21/2022] Open
Abstract
Background East Coast fever (ECF) caused by Theileria parva is endemic in Rwanda. In this study, the antigenic and genetic diversity of T. parva coupled with immunization and field challenge were undertaken to provide evidence for the introduction of ECF immunization in Rwanda. Methods Blood collected from cattle in the field was screened for T. parva using ELISA and PCR targeting the p104 gene. Tp1 and Tp2 gene sequences were generated from field samples and from Gikongoro and Nyakizu isolates. Furthermore, multilocus genotype data was generated using 5 satellite markers and an immunization challenge trial under field conditions using Muguga cocktail vaccine undertaken. Results Out of 120 samples, 44 and 20 were positive on ELISA and PCR, respectively. Antigenic diversity of the Tp1 and Tp2 gene sequences revealed an abundance of Muguga, Kiambu and Serengeti epitopes in the samples. A further three clusters were observed on both Tp1 and Tp2 phylogenetic trees; two clusters comprising of field samples and vaccine isolates and the third cluster comprising exclusively of Rwanda samples. Both antigens exhibited purifying selection with no positive selection sites. In addition, satellite marker analysis revealed that field samples possessed both shared alleles with Muguga cocktail on all loci and also a higher proportion of unique alleles. The Muguga cocktail (Muguga, Kiambu and Serengeti) genotype compared to other vaccine isolates, was the most represented in the field samples. Further low genetic sub-structuring (FST = 0.037) coupled with linkage disequilibrium between Muguga cocktail and the field samples was observed. Using the above data to guide a field immunization challenge trial comprising 41 immunized and 40 control animals resulted in 85% seroconversion in the immunized animals and an efficacy of vaccination of 81.7%, implying high protection against ECF. Conclusions Antigenic and genetic diversity analysis of T. parva facilitated the use of Muguga cocktail vaccine in field conditions. A protection level of 81.7% was achieved, demonstrating the importance of combining molecular tools with field trials to establish the suitability of implementation of immunization campaigns. Based on the information in this study, Muguga cocktail immunization in Rwanda has a potential to produce desirable results.![]()
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Affiliation(s)
| | - Walter Muleya
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Zambia, P.O. Box 32379, Lusaka, 10101, Zambia.
| | - Victor Mbao
- International Development Research Centre, Eastern and Southern Africa Regional Office, Nairobi, Kenya
| | | | | | - Jeremy Salt
- Global Alliance for Livestock Veterinary Medicines, Doherty Building, Pentlands Science Park, Bush Loan, Penicuik, Edinburgh, EH26 0PZ, Scotland, UK
| | - Boniface Namangala
- Department of Paraclinical Studies, School of Veterinary Medicine, University of Zambia, P.O. Box 32379, Lusaka, 10101, Zambia
| | - Antony Jim Musoke
- LMK Medical laboratories and consultancies, P.O. Box 33686, Kampala, Uganda
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Oundo JW, Villinger J, Jeneby M, Ong’amo G, Otiende MY, Makhulu EE, Musa AA, Ouso DO, Wambua L. Pathogens, endosymbionts, and blood-meal sources of host-seeking ticks in the fast-changing Maasai Mara wildlife ecosystem. PLoS One 2020; 15:e0228366. [PMID: 32866142 PMCID: PMC7458302 DOI: 10.1371/journal.pone.0228366] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 07/27/2020] [Indexed: 01/07/2023] Open
Abstract
The role of questing ticks in the epidemiology of tick-borne diseases in Kenya's Maasai Mara National Reserve (MMNR), an ecosystem with intensified human-wildlife-livestock interactions, remains poorly understood. We surveyed the diversity of questing ticks, their blood-meal hosts, and tick-borne pathogens to understand potential effects on human and livestock health. By flagging and hand-picking from vegetation in 25 localities, we collected 1,465 host-seeking ticks, mostly Rhipicephalus and Amblyomma species identified by morphology and molecular analysis. We used PCR with high-resolution melting (HRM) analysis and sequencing to identify Anaplasma, Babesia, Coxiella, Ehrlichia, Rickettsia, and Theileria pathogens and blood-meal remnants in 231 tick pools. We detected blood-meals from humans, wildebeest, and African buffalo in Rh. appendiculatus, goat in Rh. evertsi, sheep in Am. gemma, and cattle in Am. variegatum. Rickettsia africae was detected in Am. gemma (MIR = 3.10) that had fed on sheep and in Am. variegatum (MIR = 250) that had fed on cattle. We found Rickettsia spp. in Am. gemma (MIR = 9.29) and Rh. evertsi (MIR = 200), Anaplasma ovis in Rh. appendiculatus (MIR = 0.89) and Rh. evertsi (MIR = 200), Anaplasma bovis in Rh. appendiculatus (MIR = 0.89), and Theileria parva in Rh. appendiculatus (MIR = 24). No Babesia, Ehrlichia, or Coxiella pathogens were detected. Unexpectedly, species-specific Coxiella sp. endosymbionts were detected in all tick genera (174/231 pools), which may affect tick physiology and vector competence. These findings show that ticks from the MMNR are infected with zoonotic R. africae and unclassified Rickettsia spp., demonstrating risk of African tick-bite fever and other spotted-fever group rickettsioses to locals and visitors. The protozoan pathogens identified may also pose risk to livestock production. The diverse vertebrate blood-meals of questing ticks in this ecosystem including humans, wildlife, and domestic animals, may amplify transmission of tick-borne zoonoses and livestock diseases.
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Affiliation(s)
- Joseph Wang’ang’a Oundo
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | - Jandouwe Villinger
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
| | - Maamun Jeneby
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- Institute of Primate Research, National Museums of Kenya, Nairobi, Kenya
| | - George Ong’amo
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | | | - Edward Edmond Makhulu
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- Department of Biochemistry and Molecular Biology, Egerton University, Egerton, Kenya
| | - Ali Abdulahi Musa
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- Department of Medical Laboratory Sciences, Kenyatta University, Nairobi, Kenya
| | - Daniel Obado Ouso
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
| | - Lillian Wambua
- International Centre of Insect Physiology and Ecology (icipe), Nairobi, Kenya
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
- * E-mail:
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14
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Bishop RP, Odongo DO, Spooner PR, Morzaria SP, Oura CAL, Skilton RA. Multilocus genotyping of Theileria parva isolates associated with a live vaccination trial in Kenya provides evidence for transmission of immunizing parasites into local tick and cattle populations. Transbound Emerg Dis 2020; 67 Suppl 1:88-98. [PMID: 32174043 DOI: 10.1111/tbed.13417] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 09/20/2019] [Accepted: 10/30/2019] [Indexed: 11/29/2022]
Abstract
The live infection and treatment (ITM) vaccination procedure using the trivalent Muguga cocktail is increasingly being used to control East Coast fever, with potential implications for Theileria parva population genetic structure in the field. Transmission of the Kiambu V T. parva component to unvaccinated cattle has previously been described in Uganda. We monitored the T. parva carrier state in vaccinated and control animals on a farm in West Kenya where an ITM stabilate derived from the Kenyan T. parva Marikebuni stock was evaluated for field efficacy. A nested PCR-based Marikebuni-specific marker identified a carrier state in nine of ten vaccinated animals, detectable for a period of two years. We used 22 variable number tandem repeat (VNTR) markers to determine multilocus genotypes (MLGs) of 19 T. parva schizont-infected lymphocyte isolates derived from cattle and field ticks. Two isolates from unimmunized cattle were identical to the Marikebuni vaccination stock. Two cattle isolates were identical to a Muguga cocktail component Kiambu V. Seven isolates from ticks exhibited MLGs that were identical to the Serengeti/Muguga vaccine stocks. Six cattle and two tick-derived stocks exhibited unique MLGs. The data strongly suggest transmission of immunizing genotypes, from Marikebuni vaccine-induced carrier cattle to unimmunized cattle. It is possible that genotypes similar to those in the Muguga cocktail are present in the field in Western Kenya. An alternative hypothesis is that these parasites may have originated from vaccine trial sites in Eastern Uganda. If correct, this suggests that T. parva stocks used for immunization can potentially be disseminated 125 km beyond the immediate vaccination site. Regardless of their origin, the data provide evidence that genotypes similar to those in the Muguga cocktail are circulating in the field in East Africa, alleviating concerns about dissemination of 'alien' T. parva germplasm through live vaccination.
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Affiliation(s)
- Richard P Bishop
- International Livestock Research Institute (ILRI), Nairobi, Kenya.,Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, USA
| | - David O Odongo
- International Livestock Research Institute (ILRI), Nairobi, Kenya.,School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | - Paul R Spooner
- International Livestock Research Institute (ILRI), Nairobi, Kenya
| | | | - Chris A L Oura
- Faculty of Medical Sciences, School of Veterinary Medicine, University of the West Indies, St Augustine, Trinidad and Tobago
| | - Robert A Skilton
- International Livestock Research Institute (ILRI), Nairobi, Kenya
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15
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Bishop RP, Odongo D, Ahmed J, Mwamuye M, Fry LM, Knowles DP, Nanteza A, Lubega G, Gwakisa P, Clausen PH, Obara I. A review of recent research on Theileria parva: Implications for the infection and treatment vaccination method for control of East Coast fever. Transbound Emerg Dis 2020; 67 Suppl 1:56-67. [PMID: 32174044 DOI: 10.1111/tbed.13325] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 07/17/2019] [Accepted: 08/05/2019] [Indexed: 12/29/2022]
Abstract
The infection and treatment (ITM) live vaccination method for control of Theileria parva infection in cattle is increasingly being adopted, particularly in Maasai pastoralist systems. Several studies indicate positive impacts on human livelihoods. Importantly, the first detailed protocol for live vaccine production at scale has recently been published. However, quality control and delivery issues constrain vaccination sustainability and deployment. There is evidence that the distribution of T. parva is spreading from endemic areas in East Africa, North into Southern Sudan and West into Cameroon, probably as a result of anthropogenic movement of cattle. It has also recently been demonstrated that in Kenya, T. parva derived from cape buffalo can 'breakthrough' the immunity induced by ITM. However, in Tanzania, breakthrough has not been reported in areas where cattle co-graze with buffalo. It has been confirmed that buffalo in northern Uganda national parks are not infected with T. parva and R. appendiculatus appears to be absent, raising issues regarding vector distribution. Recently, there have been multiple field population genetic studies using variable number tandem repeat (VNTR) sequences and sequencing of antigen genes encoding targets of CD8+ T-cell responses. The VNTR markers generally reveal high levels of diversity. The antigen gene sequences present within the trivalent Muguga cocktail are relatively conserved among cattle transmissible T. parva populations. By contrast, greater genetic diversity is present in antigen genes from T. parva of buffalo origin. There is also evidence from several studies for transmission of components of stocks present within the Muguga cocktail, into field ticks and cattle following induction of a carrier state by immunization. In the short term, this may increase live vaccine effectiveness, through a more homogeneous challenge, but the long-term consequences are unknown.
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Affiliation(s)
- Richard P Bishop
- Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA, USA
| | - David Odongo
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | - Jabbar Ahmed
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Micky Mwamuye
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Lindsay M Fry
- Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA, USA.,Animal Disease Research Unit, Agricultural Research Service, US Department of Agriculture, Pullman, WA, USA
| | - Donald P Knowles
- Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA, USA
| | - Anne Nanteza
- College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala, Uganda
| | - George Lubega
- College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala, Uganda
| | - Paul Gwakisa
- Genome Science Laboratory, College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Peter-Henning Clausen
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Isaiah Obara
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
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16
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Gwakisa P, Kindoro F, Mwega E, Kimera S, Obara I, Ahmed J, Clausen PH, Bishop R. Monitoring vaccinated cattle for induction and longevity of persistent tick-transmissible infection: Implications for wider deployment of live vaccination against East Coast fever in Tanzania. Transbound Emerg Dis 2020; 67 Suppl 1:79-87. [PMID: 32174035 DOI: 10.1111/tbed.13405] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 09/30/2019] [Accepted: 10/19/2019] [Indexed: 11/29/2022]
Abstract
The infection and treatment (ITM) procedure remains the only available method of immunization against Theileria parva infection. One constraint to deployment is the perception that the carrier state induced by ITM could result in enhanced disease problems. More than one million cattle have been ITM vaccinated in pastoralist systems in Tanzania over the last 2 decades. We present the results of a longitudinal study of six groups of cattle in Maasai villages in northern Tanzania exposed to natural tick challenge for between 2 weeks and 14 years post-vaccination. The p104 nested PCR revealed a higher frequency of T. parva carriers among vaccinates (30%) compared with controls (8%) (OR = 4.89, p = .000), with the highest frequency of carriers found in calves vaccinated 6 months previously, although carrier state was also detected in cattle vaccinated >10 years prior to the study. Variable number tandem repeat genotype analysis revealed 6 MS7 alleles with sizes ranging from 150 bp to 500 bp, but only two alleles were detected in cattle vaccinated >4 years earlier, relative to five alleles detected in recently vaccinated cattle and controls. In terms of heterozygosity, diversity was maximal in calves vaccinated within the last 2 weeks (h = 0.776) but lowest in cattle vaccinated 4 years earlier (h = 0.375). The analysis suggested close genetic relatedness of parasites in vaccinated and unvaccinated groups and up to 96% of variation was within rather than between the groups. These results confirm that ITM leads to a long-term T. parva carrier state in cattle and the detection of vaccine component VNTR in co-grazing unvaccinated cattle suggests potential vaccine transmission by ticks. However, vaccination stocks did not totally replace local genotypes, at least in cattle populations. These findings should mitigate concerns that ITM modifies T. parva field populations in a way that enhances disease in the medium term.
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Affiliation(s)
- Paul Gwakisa
- Genome Science laboratory, College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Fatuma Kindoro
- Genome Science laboratory, College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Elisa Mwega
- Genome Science laboratory, College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Sharadhuli Kimera
- Genome Science laboratory, College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Isaiah Obara
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Jabbar Ahmed
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Peter-Henning Clausen
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Richard Bishop
- Department of Veterinary Microbiology & Pathology, Washington State University, Pullman, WA, USA
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17
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Mukolwe LD, Odongo DO, Byaruhanga C, Snyman LP, Sibeko-Matjila KP. Analysis of p67 allelic sequences reveals a subtype of allele type 1 unique to buffalo-derived Theileria parva parasites from southern Africa. PLoS One 2020; 15:e0231434. [PMID: 32598384 PMCID: PMC7323972 DOI: 10.1371/journal.pone.0231434] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 06/13/2020] [Indexed: 11/18/2022] Open
Abstract
East Coast fever (ECF) and Corridor disease (CD) caused by cattle- and buffalo-derived T. parva respectively are the most economically important tick-borne diseases of cattle in the affected African countries. The p67 gene has been evaluated as a recombinant subunit vaccine against ECF, and for discrimination of T. parva parasites causing ECF and Corridor disease. The p67 allele type 1 was first identified in cattle-derived T. parva parasites from East Africa, where parasites possessing this allele type have been associated with ECF. Subsequent characterization of buffalo-derived T. parva parasites from South Africa where ECF was eradicated, revealed the presence of a similar allele type, raising concerns as to whether or not allele type 1 from parasites from the two regions is identical. A 900 bp central fragment of the gene encoding p67 was PCR amplified from T. parva DNA extracted from blood collected from cattle and buffalo in South Africa, Mozambique, Kenya, Tanzania and Uganda, followed by DNA sequence analysis. Four p67 allele types previously described were identified. A subtype of p67 allele type 1 was identified in parasites from clinical cases of CD and buffalo from southern Africa. Notably, p67 allele type 1 sequences from parasites associated with ECF in East Africa and CD in Kenya were identical. Analysis of two p67 B-cell epitopes (TpM12 and AR22.7) revealed amino acid substitutions in allele type 1 from buffalo-derived T. parva parasites from southern Africa. However, both epitopes were conserved in allele type 1 from cattle- and buffalo-derived T. parva parasites from East Africa. These findings reveal detection of a subtype of p67 allele type 1 associated with T. parva parasites transmissible from buffalo to cattle in southern Africa.
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Affiliation(s)
- Lubembe D. Mukolwe
- Vectors and Vector-borne Diseases Research Programme, Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
- Department of Veterinary Pathology, Microbiology & Parasitology, Faculty of Veterinary Medicine and Surgery, Egerton University, Egerton, Kenya
- * E-mail:
| | - David O. Odongo
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | - Charles Byaruhanga
- Vectors and Vector-borne Diseases Research Programme, Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
- National Agricultural Research Organization, Entebbe, Uganda
| | - Louwtjie P. Snyman
- Vectors and Vector-borne Diseases Research Programme, Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
- Durban Natural Science Museum, Durban, South Africa
| | - Kgomotso P. Sibeko-Matjila
- Vectors and Vector-borne Diseases Research Programme, Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
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18
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Genetic Diversity and Sequence Polymorphism of Two Genes Encoding Theileria parva Antigens Recognized by CD8 + T Cells among Vaccinated and Unvaccinated Cattle in Malawi. Pathogens 2020; 9:pathogens9050334. [PMID: 32365795 PMCID: PMC7281522 DOI: 10.3390/pathogens9050334] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/24/2020] [Accepted: 04/26/2020] [Indexed: 01/07/2023] Open
Abstract
East Coast fever (ECF) is an acute fatal tick-borne disease of cattle caused by Theileria parva. It causes major losses in exotic and crossbreed cattle, but this could be prevented by a vaccine of T. parva if the vaccine is selected properly based on information from molecular epidemiology studies. The Muguga cocktail (MC) vaccine (Muguga, Kiambu 5 and Serengeti-transformed strains) has been used on exotic and crossbreed cattle. A total of 254 T. parva samples from vaccinated and unvaccinated cattle were used to understand the genetic diversity of T. parva in Malawi using partial sequences of the Tp1 and Tp2 genes encoding T. parva CD8+ antigens, known to be immunodominant and current candidate antigens for a subunit vaccine. Single nucleotide polymorphisms were observed at 14 positions (3.65%) in Tp1 and 156 positions (33.12%) in Tp2, plus short deletions in Tp1, resulting in 6 and 10 amino acid variants in the Tp1 and Tp2 genes, respectively. Most sequences were either identical or similar to T. parva Muguga and Kiambu 5 strains. This may suggest the possible expansion of vaccine components into unvaccinated cattle, or that a very similar genotype already existed in Malawi. This study provides information that support the use of MC to control ECF in Malawi.
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Kuiper M, Spencer M, Kanyima BM, Ng CH, Newell M, Turyahikayo S, Makoni N, Madan D, Lieberman DH. Using on-demand dry ice production as an alternative cryogenic cold chain for bovine artificial insemination outreach in low-resource settings. Transl Anim Sci 2020; 4:txaa012. [PMID: 32705012 PMCID: PMC7201085 DOI: 10.1093/tas/txaa012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 01/31/2020] [Indexed: 11/13/2022] Open
Abstract
Artificial insemination (AI) is widely used in livestock industries to breed for desirable characteristics and increase yields. The standard practice of storing and transporting bovine semen uses liquid nitrogen (LN), a scarce commodity in many regions of the world. This study explored the feasibility of using dry ice, a more readily available alternative. We developed equipment that dispenses dry ice from widely available liquid carbon dioxide (LCO2) tanks into an easily transportable device. In vivo fertility results with a dry ice cold chain showed no statistical difference to the conventional LN method. In vitro bovine semen analyses also showed that storage under these conditions minimally affects characteristics associated with fertility. A dry ice cold chain system could leverage the global availability of LCO2 to expand the reach of AI and other cold storage applications of biological materials in low-resource settings.
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Affiliation(s)
- Mark Kuiper
- Intellectual Ventures' Global Good Fund, Bellevue, WA
| | | | - Benon M Kanyima
- School of Veterinary and Animal Resources, COVAB, Makerere University, Kampala, Uganda
| | - Chin H Ng
- Intellectual Ventures' Global Good Fund, Bellevue, WA
| | - Mark Newell
- Intellectual Ventures' Global Good Fund, Bellevue, WA
| | - Silver Turyahikayo
- African Breeders Services Total Cattle Management Limited, Nairobi, Kenya
| | - Nathaniel Makoni
- African Breeders Services Total Cattle Management Limited, Nairobi, Kenya
| | - Damian Madan
- Intellectual Ventures' Global Good Fund, Bellevue, WA
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A Rational Explanation of Limited FMD Vaccine Uptake in Endemic Regions. Pathogens 2019; 8:pathogens8040181. [PMID: 31658689 PMCID: PMC6963929 DOI: 10.3390/pathogens8040181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 10/07/2019] [Accepted: 10/08/2019] [Indexed: 11/25/2022] Open
Abstract
Vaccination for foot-and-mouth (FMD) disease remains low in parts of Africa despite the existence of vaccines. In East Africa, the presence of multiple virus serotypes and sub-types makes matching a vaccine with the circulating virus type in the field, or providing a high potency vaccine, a challenge. In this paper we use game theory to show that the resulting vaccine uncertainty associated with these vaccination conditions in an endemic setting help explain the low vaccine uptake. We evaluate vaccination for FMD in the context of East Africa due to FMD being endemic in the region, the diversity of FMD virus types, and barriers to implementing other disease control measures, such as controlled movements. We incorporate these conditions into a vaccination game setting and compare the payoffs to those of a traditional vaccination game for seasonal influenza and commercial livestock vaccination in a developed country context. In showing that vaccination provides households with a lower payoff than not vaccinating, our simple game theoretical explanation supports existing evidence calling for improved vaccine quality and efforts to enhance surveillance to provide early information on disease status.
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Magulu E, Kindoro F, Mwega E, Kimera S, Shirima G, Gwakisa P. Detection of carrier state and genetic diversity of Theileria parva in ECF-vaccinated and naturally exposed cattle in Tanzania. Vet Parasitol Reg Stud Reports 2019; 17:100312. [PMID: 31303233 DOI: 10.1016/j.vprsr.2019.100312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/27/2019] [Accepted: 06/07/2019] [Indexed: 10/26/2022]
Abstract
Infection and Treatment Method (ITM) has been practiced in Tanzania for over 20 years as a prevention measure against East Coast Fever disease. It is known that ITM, like natural ECF infection, leads to a carrier state, whereby vaccinated cattle become asymptomatic carriers of the parasite. It is expected that ECF vaccination using ITM also leads to generation of combinations of vaccine specific Theileria parva and local strains that circulate in the field what contributes to an unknown level of parasite diversity. Moreover, the long term impact of ITM on carrier state and parasite diversity in cattle are largely unknown. To address this question blood was collected from ECF-vaccinated (n = 239) and unvaccinated (n = 97) cattle from Loiborsoit, Emboreet, Esilalei, Manyara ranch and Mswakini villages in the Maasai steppe of northern Tanzania, as well as Mruazi and Leila farms in Tanga in eastern Tanzania. Screening for T. parva using nested PCR revealed an overall prevalence of T. parva to be 34.5%, with a significant higher prevalence among ECF-vaccinated cattle. Using three VNTR markers (ms2, ms5 and MS7) higher parasite genetic diversity in terms of higher number of alleles and expected heterozygosity was shown in vaccinated than unvaccinated cattle. These parameters were highest in cattle from Manyara ranch. Nevertheless, the principle component analysis (PCoA) showed no distinct clustering patterns as most T. parva alleles clustered together throughout the four quadrants implying parasite homogeneity among the sampled populations. However, some of the parasite alleles closely clustered with Muguga vaccine alleles in two of the quadrants, consistent with closer genetic relatedness between the vaccine strains and the T. parva populations from the Maasai steppe. Likewise analysis of molecular variance (AMOVA) revealed most of the genetic variation (93%) being contained within populations with only 7% being among populations. This study therefore confirms the role of ECF vaccination in enhancing carrier state and T. parva diversity in vaccinated cattle populations. Higher T. parva diversity may play an important role in carrier cattle by way of restricting breakthrough infections from field parasite strains.
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Affiliation(s)
- Emelesiana Magulu
- School of Life Sciences and Bioengineering, Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania
| | - Fatuma Kindoro
- College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, P.O. Box 3019, Morogoro, Tanzania
| | - Elisa Mwega
- College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, P.O. Box 3019, Morogoro, Tanzania
| | - Sharadhuli Kimera
- College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, P.O. Box 3019, Morogoro, Tanzania
| | - Gabriel Shirima
- School of Life Sciences and Bioengineering, Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania
| | - Paul Gwakisa
- College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, P.O. Box 3019, Morogoro, Tanzania.
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Nyagwange J, Awino E, Tijhaar E, Svitek N, Pelle R, Nene V. Leveraging the Medicines for Malaria Venture malaria and pathogen boxes to discover chemical inhibitors of East Coast fever. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2019; 9:80-86. [PMID: 30771616 PMCID: PMC6376154 DOI: 10.1016/j.ijpddr.2019.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 01/14/2019] [Accepted: 01/14/2019] [Indexed: 11/17/2022]
Abstract
Chemotherapy of East Coast fever, a lymphoproliferative cancer-like disease of cattle causing significant economic losses in Africa, is largely dependent on the use of buparvaquone, a drug that was developed in the late 1980's. The disease is caused by the tick-borne protozoan pathogen Theileria parva. Buparvaquone can be used prophylactically and it is also active against tropical theileriosis, caused by the related parasite Theileria annulata. Recently, drug resistance was reported in T. annulata, and could occur in T. parva. Using a 3H-thymidine incorporation assay we screened 796 open source compounds from the Medicines for Malaria Venture (MMV) to discover novel chemicals with potential inhibitory activity to T. parva. We identified nine malaria box compounds and eight pathogen box compounds that inhibited the proliferation of F100TpM, a T. parva infected lymphocyte cell line. However, only two compounds, MMV008212 and MMV688372 represent promising leads with IC50 values of 0.78 and 0.61 μM, respectively, and CC50 values > 5 μM. The remaining compounds exhibited a high degree of toxicity (CC50 values < 1.09 μM) on the proliferation of bovine peripheral blood mononuclear cells stimulated with concanavalin A. We also tested the anti-cancer drug, dasatinib, used in the chemotherapy of some leukemias. Dasatinib was as active and safe as buparvaquone in vitro, with an IC50 of 5 and 4.2 nM, respectively, and CC50 > 10 μM. Our preliminary data suggest that it may be possible to repurpose compounds from the cancer field as well as MMV as novel anti-T. parva molecules. 17 of 796 MMV compounds inhibited proliferation of T parva infected lymphocytes. 15 of the 17 hit compounds also inhibited proliferation of control cells. MMV008212 and MMV688372 represent promising leads, therapeutic index >8. Dasatinib was as active and safe as buparvaquone in vitro, therapeutic index >2000.
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Affiliation(s)
- James Nyagwange
- International Livestock Research Institute, P. O. Box 30709, Nairobi, Kenya; Cell Biology and Immunology Group, Wageningen University, the Netherlands
| | - Elias Awino
- International Livestock Research Institute, P. O. Box 30709, Nairobi, Kenya
| | - Edwin Tijhaar
- Cell Biology and Immunology Group, Wageningen University, the Netherlands
| | - Nicholas Svitek
- International Livestock Research Institute, P. O. Box 30709, Nairobi, Kenya
| | - Roger Pelle
- Biosciences Eastern and Central Africa, International Livestock Research Institute (BecA-ILRI) Hub, P. O. Box 30709, Nairobi, Kenya
| | - Vishvanath Nene
- International Livestock Research Institute, P. O. Box 30709, Nairobi, Kenya.
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Warimwe GM, Purushotham J, Perry BD, Hill AV, Gilbert SC, Dungu B, Charleston B. Tackling human and animal health threats through innovative vaccinology in Africa. AAS Open Res 2018; 1:18. [PMID: 32259020 PMCID: PMC7118973 DOI: 10.12688/aasopenres.12877.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2018] [Indexed: 07/27/2023] Open
Abstract
Africa bears the brunt of many of the world's most devastating human and animal infectious diseases, a good number of which have no licensed or effective vaccines available. The continent's potential to generate novel interventions against these global health threats is however largely untapped. Strengthening Africa's vaccine research and development (R&D) sector could accelerate discovery, development and deployment of effective countermeasures against locally prevalent infectious diseases, many of which are neglected and have the capacity to spread to new geographical settings. Here, we review Africa's human and veterinary vaccine R&D sectors and identify key areas that should be prioritized for investment, and synergies that could be exploited from Africa's veterinary vaccine industry, which is surprisingly strong and has close parallels with human vaccine R&D.
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Affiliation(s)
- George M. Warimwe
- Kenya Medical Research Institute-Wellcome Trust Research Programme, Kilifi, Kenya
- The Pirbright Institute, Woking, GU24 0NF, UK
| | | | - Brian D. Perry
- The Jenner Institute, University of Oxford, Oxford, OX3 7DQ, UK
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Warimwe GM, Purushotham J, Perry BD, Hill AVS, Gilbert SC, Dungu B, Charleston B. Tackling human and animal health threats through innovative vaccinology in Africa. AAS Open Res 2018; 1:18. [PMID: 32259020 PMCID: PMC7118973 DOI: 10.12688/aasopenres.12877.2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2018] [Indexed: 11/20/2022] Open
Abstract
Africa bears the brunt of many of the world's most devastating human and animal infectious diseases, a good number of which have no licensed or effective vaccines available. The continent's potential to generate novel interventions against these global health threats is however largely untapped. Strengthening Africa's vaccine research and development (R&D) sector could accelerate discovery, development and deployment of effective countermeasures against locally prevalent infectious diseases, many of which are neglected and have the capacity to spread to new geographical settings. Here, we review Africa's human and veterinary vaccine R&D sectors and identify key areas that should be prioritized for investment, and synergies that could be exploited from Africa's veterinary vaccine industry, which is surprisingly strong and has close parallels with human vaccine R&D.
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Affiliation(s)
- George M Warimwe
- Kenya Medical Research Institute-Wellcome Trust Research Programme, Kilifi, Kenya.,The Pirbright Institute, Woking, GU24 0NF, UK
| | | | - Brian D Perry
- The Jenner Institute, University of Oxford, Oxford, OX3 7DQ, UK
| | - Adrian V S Hill
- The Jenner Institute, University of Oxford, Oxford, OX3 7DQ, UK
| | - Sarah C Gilbert
- The Jenner Institute, University of Oxford, Oxford, OX3 7DQ, UK
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Svitek N, Saya R, Awino E, Munyao S, Muriuki R, Njoroge T, Pellé R, Ndiwa N, Poole J, Gilbert S, Nene V, Steinaa L. An Ad/MVA vectored Theileria parva antigen induces schizont-specific CD8 + central memory T cells and confers partial protection against a lethal challenge. NPJ Vaccines 2018; 3:35. [PMID: 30245859 PMCID: PMC6134044 DOI: 10.1038/s41541-018-0073-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/22/2018] [Accepted: 07/02/2018] [Indexed: 01/03/2023] Open
Abstract
The parasite Theileria parva is the causative agent of East Coast fever (ECF), one of the most serious cattle diseases in sub-Saharan Africa, and directly impacts smallholder farmers’ livelihoods. There is an efficient live-parasite vaccine, but issues with transmission of vaccine strains, need of a cold chain, and antibiotics limit its utilization. This has fostered research towards subunit vaccination. Cytotoxic T lymphocytes (CTL) are crucial in combating the infection by lysing T. parva-infected cells. Tp1 is an immunodominant CTL antigen, which induces Tp1-specific responses in 70–80% of cattle of the A18 or A18v haplotype during vaccination with the live vaccine. In this study, human adenovirus serotype 5 (HAd5) and modified vaccinia Ankara (MVA) were assessed for their ability to induce Tp1-specific immunity. Both viral vectors expressing the Tp1 antigen were inoculated in cattle by a heterologous prime-boost vaccination regimen. All 15 animals responded to Tp1 as determined by ELISpot. Of these, 14 reacted to the known Tp1 epitope, assayed by ELISpot and tetramer analyses, with CTL peaking 1-week post-MVA boost. Eleven animals developed CTL with specific cytotoxic activity towards peripheral blood mononuclear cells (PBMC) pulsed with the Tp1 epitope. Moreover, 36% of the animals with a Tp1 epitope-specific response survived a lethal challenge with T. parva 5 weeks post-MVA boost. Reduction of the parasitemia correlated with increased percentages of central memory lymphocytes in the Tp1 epitope-specific CD8+ populations. These results indicate that Tp1 is a promising antigen to include in a subunit vaccine and central memory cells are crucial for clearing the parasite. A vaccine expressing parasitic proteins offers more convenient East Coast fever prophylaxis. Current vaccination for the cattle disease, caused by the parasite Theileria parva and a detriment to sub-Saharan African farmers, involves inconvenient injection with live parasites before antibiotic treatment (ITM). A collaboration led by Nicholas Svitek, of the Kenyan International Livestock Research Institute, designed a candidate to provoke cellular immune responses against the parasitic antigen Tp1—an ITM vaccine candidate. In tests on cattle, 93% created Tp1-targeting T cells, and 33% survived a lethal dose of T. parva. The East Coast fever reduction seen in animals in this research outperformed a recent study and was able to generate the same immune memory cells that ITM inspires to provide long-lasting protection. Future research might integrate more antigens with this Tp1 vaccine to provide more comprehensive protection.
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Affiliation(s)
- Nicholas Svitek
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Rosemary Saya
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Elias Awino
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Stephen Munyao
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Robert Muriuki
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Thomas Njoroge
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Roger Pellé
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Nicholas Ndiwa
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Jane Poole
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Sarah Gilbert
- 2The Jenner Institute, University of Oxford, Old Road Campus Research Building, Roosevelt Drive Oxford, OX3 7DQ UK
| | - Vishvanath Nene
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
| | - Lucilla Steinaa
- 1International Livestock Research Institute (ILRI), P.O. Box 30709, 00100 Nairobi, Kenya
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Tayebwa DS, Vudriko P, Tuvshintulga B, Guswanto A, Nugraha AB, Gantuya S, Batiha GES, Musinguzi SP, Komugisha M, Bbira JS, Okwee-Acai J, Tweyongyere R, Wampande EM, Byaruhanga J, Adjou Moumouni PF, Sivakumar T, Yokoyama N, Igarashi I. Molecular epidemiology of Babesia species, Theileria parva, and Anaplasma marginale infecting cattle and the tick control malpractices in Central and Eastern Uganda. Ticks Tick Borne Dis 2018; 9:1475-1483. [PMID: 30017724 DOI: 10.1016/j.ttbdis.2018.06.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 06/23/2018] [Accepted: 06/27/2018] [Indexed: 12/01/2022]
Abstract
East Coast fever, babesiosis, and anaplasmosis are the major tick-borne diseases affecting cattle productivity in Uganda. The emergence of acaricide-resistant ticks is suspected to have caused a rise in hemoparasites. This study sought to detect and characterize hemoparasites among farms in acaricide-failure hotspots of central as compared to the acaricide-failure naïve areas in Eastern Uganda. Nested PCR assays were performed to determine the prevalences of Babesia bovis, Babesia bigemina, Theileria parva, and Anaplasma marginale in cattle blood samples sourced from randomly selected farms. Randomly selected isolates were sequenced to determine the genetic diversity of the parasites using the following marker genes: B. bovis spherical body protein 4, B. bigemina rhoptry-associated protein 1a, T. parva 104 kDa microneme-rhoptry antigen, and A. marginale major surface protein 5. Furthermore, partially and fully engorged adult ticks were collected for taxonomy, and tick-control practices were assessed using a semi-structured questionnaire. The prevalences of B. bigemina, T. parva, and A. marginale in cattle were 17.2, 65.1, and 22.0%, and 10.0, 26.5, and 3% in the central and eastern region, respectively. Whilst, B. bovis was not detected in the farms involved. The sequences for B. bigemina, T. parva, and A. marginale from the central region showed 99% identity with those from the eastern region. Of the 548 ticks collected, 319, 147, 76, and 6 were Rhipicephalus (Boophilus) decoloratus, Rhipicephalus appendiculatus, Amblyomma variegatum, and Rhipicephalus evertsi evertsi, respectively. The Rhipicephalus ticks were more abundant in the central region, whereas A. variegatum ticks were more abundant in the eastern region. Tick control malpractices were found in both Central and Eastern Uganda, and 42 of the 56 surveyed farms lacked appropriate restraining facilities and so they utilized either ropes or a 'boma' (enclosure). In summary, B. bigemina, T. parva, A. marginale and their co-infections were more prevalent in the central than eastern region; even though, tick control malpractices were observed in both regions. Therefore, an urgent tick and TBD control strategy is needed.
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Affiliation(s)
- Dickson Stuart Tayebwa
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan; Central Diagnostic Laboratory, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda; Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Patrick Vudriko
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan; Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda; School of Veterinary Medicine and Animal Resources, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Bumduuren Tuvshintulga
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Azirwan Guswanto
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Arifin Budiman Nugraha
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Sambuu Gantuya
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Gaber El-Saber Batiha
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan; Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, 22511, Albeheira, Egypt.
| | - Simon Peter Musinguzi
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Mariam Komugisha
- Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Jonh Son Bbira
- Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - James Okwee-Acai
- Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda; School of Veterinary Medicine and Animal Resources, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Robert Tweyongyere
- School of Veterinary Medicine and Animal Resources, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Eddie M Wampande
- School of Veterinary Medicine and Animal Resources, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Joseph Byaruhanga
- Research Center for Ticks and Tick-borne Diseases, Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, 7062, Kampala, Uganda.
| | - Paul Franck Adjou Moumouni
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Thillaiampalam Sivakumar
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Naoaki Yokoyama
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
| | - Ikuo Igarashi
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2 Sen-11, Inada-cho, 080-8555, Obihiro, Hokkaido, Japan.
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