Full Text Journal Articles by
Author Johan P Schoeman

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Experimental Babesia rossi infection induces hemolytic, metabolic, and viral response pathways in the canine host.

Rachel L Smith, Amelia Goddard, Arun Boddapati, Steven Brooks, Johan P Schoeman, Justin Lack, Andrew Leisewitz, Hans Ackerman,

<h4>Background</h4>Babesia rossi is a leading cause of morbidity and mortality among the canine population of sub-Saharan Africa, but pathogenesis remains poorly understood. Previous studies of B. rossi infection were derived from clinical cases, in which neither the onset of infection nor the infectious inoculum was known. Here, we performed controlled ... Read more >>

BMC Genomics (BMC genomics)
[2021, 22(1):619]

Cited: 0 times

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Influence of high-protein and high-carbohydrate diets on serum lipid and fructosamine concentrations in healthy cats.

Chad F Berman, Remo G Lobetti, Eric Zini, Geoffrey T Fosgate, Johan P Schoeman,

<h4>Objectives</h4>The aim of this study was to determine whether high-protein and high-carbohydrate diets exert differential effects on serum cholesterol, triglyceride and fructosamine concentrations in healthy cats.<h4>Methods</h4>A randomised, crossover diet trial was performed in 35 healthy shelter cats. Following baseline health assessments, cats were randomised into groups receiving either a high-protein ... Read more >>

J Feline Med Surg (Journal of feline medicine and surgery)
[2021, :1098612X211047062]

Cited: 0 times

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Thromboelastographic platelet mapping in dogs with complicated Babesia rossi infection.

Liesl J van Rooyen, Emma H Hooijberg, Johan P Schoeman, Amelia Goddard,

BACKGROUND:Dogs with Babesia rossi infection display a normocoagulable thromboelastogram, despite being markedly thrombocytopenic, which is purportedly due to large-scale platelet activation. Thromboelastographic platelet mapping (TEG-PM) evaluates individual contributions of thrombin, fibrinogen, and platelets to clot formation, and may elucidate some of the pathomechanisms of thrombocytopenia-associated hemostatic alterations. OBJECTIVE:This study investigated ... Read more >>

Vet Clin Pathol (Veterinary clinical pathology)
[2019, 48(1):11-18]

Cited: 1 time

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A clinical and pathological description of 320 cases of naturally acquired Babesia rossi infection in dogs.

Andrew L Leisewitz, Amelia Goddard, Sarah Clift, Peter N Thompson, Jill de Gier, Jessica M A J A J Van Engelshoven, Johan P Schoeman,

Babesia rossi causes the most severe clinical disease in dogs of all the babesia parasites. We included 320 naturally-infected dogs that presented for care at the Onderstepoort Veterinary Academic Hospital between 2006 and 2016. All dogs had mono-infections confirmed by multiplex PCR. The data allowed more accurate clinical classification of ... Read more >>

Vet Parasitol (Veterinary parasitology)
[2019, 271:22-30]

Cited: 4 times

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Disease severity and blood cytokine concentrations in dogs with natural Babesia rossi infection.

Andrew Leisewitz, Amelia Goddard, Jill De Gier, Jessica Van Engelshoven, Sarah Clift, Peter Thompson, Johan P Schoeman,

<h4>Aims</h4>Babesia rossi causes severe disease in dogs. Here, we describe the association between serum cytokine concentrations and disease severity.<h4>Methods</h4>Seventeen controls and 55 PCR confirmed B rossi-infected dogs were included. Diseased dogs were subdivided into 23 critically ill and 32 relatively well cases. Serum concentrations of 11 cytokines and biochemical markers of ... Read more >>

Parasite Immunol (Parasite immunology)
[2019, 41(7):e12630]

Cited: 7 times

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Vitamin D status in dogs with babesiosis.

Eran Dvir, Chantal Rosa, Ian Handel, Richard J Mellanby, Johan P Schoeman,

Canine babesiosis is a virulent infection of dogs in South Africa caused principally by Babesia rossi. Hypovitaminosis D has been reported in a wide range of infectious diseases in humans and dogs, and low vitamin D status has been associated with poor clinical outcomes. However, the relationship between vitamin D status ... Read more >>

Onderstepoort J Vet Res (The Onderstepoort journal of veterinary research)
[2019, 86(1):e1-e5]

Cited: 2 times

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Prevalence of Salmonella in juvenile dogs affected with parvoviral enteritis.

Willem J Botha, Johan P Schoeman, Stanley L Marks, Zandri Whitehead, Cornelius H Annandale,

Salmonellosis is a disease of major zoonotic importance and canine parvovirus is a potentially fatal cause of canine enteritis with a world-wide distribution. Persistent isolation of Salmonella during routine environmental sampling surveys of a hospital ward, reserved for the treatment of dogs with canine parvovirus infection, prompted investigation into a ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2018, 89(0):e1-e6]

Cited: 4 times

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Aortic Arch Baroreceptor Stimulation in an Experimental Goat Model: A Novel Method to Lower Blood Pressure.

Jacobus F Benson, Johan P Schoeman, Frans J Venter, James A Ker, Gareth E Zeiler, Lynette Bester, Janet van Niekerk, Gregory R Tintinger,

The effect of aortic baroreceptor stimulation on blood pressure manipulation was assessed using the goat species Capra aegagrus hircus. The aim of this study was to manipulate blood pressure with future intention to treat high blood pressure in humans. The ages of the animals ranged from 6 months to 2 ... Read more >>

Front Cardiovasc Med (Frontiers in cardiovascular medicine)
[2018, 5:193]

Cited: 0 times

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Stability of glomerular and tubular renal injury biomarkers in canine urine after 4 years of storage.

Pieter Defauw, Evelyne Meyer, Luc Duchateau, Johan P Schoeman, Isabel Van de Maele, Sylvie Daminet,

Urine biomarkers are sensitive indicators of early-stage renal injury, consequently, research in this area is expanding in both human and veterinary medicine. However, studies investigating the impact of preanalytical factors, such as storage conditions, on urine biomarker concentrations are largely lacking in veterinary medicine. Therefore, we evaluated the stability of ... Read more >>

J Vet Diagn Invest (Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc)
[2017, 29(3):346-350]

Cited: 2 times

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Prevalence of and risk factors for feline hyperthyroidism in South Africa.

Joanne L McLean, Remo G Lobetti, Carmel T Mooney, Peter N Thompson, Johan P Schoeman,

Objectives Hyperthyroidism is a disorder of older cats that may have a geographical variation in prevalence. Prevalence studies have not yet been performed in South Africa, a geographical area where hyperthyroidism in cats has recently been observed and where, reportedly, the incidence appears to be increasing. The purpose of this ... Read more >>

J Feline Med Surg (Journal of feline medicine and surgery)
[2017, 19(10):1103-1109]

Cited: 2 times

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LAPAROSCOPIC SALPINGECTOMY IN TWO CAPTIVE LEOPARDS (PANTHERA PARDUS) USING A SINGLE PORTAL ACCESS SYSTEM.

Marthinus J Hartman, Eric Monnet, Robert M Kirberger, Johan P Schoeman,

Laparoscopic salpingectomy was performed in two adult leopards (Panthera pardus) using a single portal access system, with a multicannulated single-incision laparoscopic surgery port, without any complications. The poorly developed ovarian bursa provided easy access to the uterine tube for salpingectomy. Laparoscopic salpingectomy can be safely performed in the leopard using ... Read more >>

J Zoo Wildl Med (Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians)
[2015, 46(4):945-948]

Cited: 4 times

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Excessive Pro-Inflammatory Serum Cytokine Concentrations in Virulent Canine Babesiosis.

Amelia Goddard, Andrew L Leisewitz, Mads Kjelgaard-Hansen, Annemarie T Kristensen, Johan P Schoeman,

Babesia rossi infection causes a severe inflammatory response in the dog, which is the result of the balance between pro- and anti-inflammatory cytokine secretion. The aim of this study was to determine whether changes in cytokine concentrations were present in dogs with babesiosis and whether it was associated with disease ... Read more >>

PLoS One (PloS one)
[2016, 11(3):e0150113]

Cited: 19 times

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Reference intervals for selected serum biochemistry analytes in cheetahs Acinonyx jubatus.

Gavin C Hudson-Lamb, Johan P Schoeman, Emma H Hooijberg, Sonja K Heinrich, Adrian S W Tordiffe,

Published haematologic and serum biochemistry reference intervals are very scarce for captive cheetahs and even more for free-ranging cheetahs. The current study was performed to establish reference intervals for selected serum biochemistry analytes in cheetahs. Baseline serum biochemistry analytes were analysed from 66 healthy Namibian cheetahs. Samples were collected from ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2016, 87(1):1316]

Cited: 2 times

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Single-Incision Laparoscopic Sterilization of the Cheetah (Acinonyx jubatus).

Marthinus J Hartman, Eric Monnet, Robert M Kirberger, Anne Schmidt-Küntzel, Martin L Schulman, Jana A Stander, George F Stegmann, Johan P Schoeman,

OBJECTIVE:To describe laparoscopic ovariectomy and salpingectomy in the cheetah (Acinonyx jubatus) using single-incision laparoscopic surgery (SILS). STUDY DESIGN:Prospective cohort. ANIMALS:Female cheetahs (Acinonyx jubatus) (n = 21). METHODS:Cheetahs were randomly divided to receive either ovariectomy (n = 11) or salpingectomy (n = 10). The use and complications of a SILS port was evaluated in all of cheetahs. ... Read more >>

Vet Surg (Veterinary surgery : VS)
[2015, 44 Suppl 1:76-82]

Cited: 5 times

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Platelet activation and platelet-leukocyte interaction in dogs naturally infected with Babesia rossi.

Amelia Goddard, Andrew L Leisewitz, Annemarie T Kristensen, Johan P Schoeman,

Using flow cytometry, platelet-leukocyte aggregate (PLA) formation has previously been documented in dogs with a variety of systemic inflammatory disorders and immune-mediated haemolytic anaemia. Platelet activation and subsequent interaction between platelets and leukocytes are important for regulating innate immunity and systemic inflammation. The objective of this study was to investigate ... Read more >>

Vet J (Veterinary journal (London, England : 1997))
[2015, 205(3):387-392]

Cited: 4 times

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Platelet indices in dogs with Babesia rossi infection.

Amelia Goddard, Andrew L Leisewitz, Annemarie T Kristensen, Johan P Schoeman,

<h4>Background</h4>Thrombocytopenia without clinical bleeding is a consistent finding in virulent canine babesiosis.<h4>Objectives</h4>The purpose of the study was to investigate the platelet index phenotype in Babesia rossi-infected dogs and the association with disease outcome. We hypothesized that an increased proportion of large, activated platelets would be present.<h4>Methods</h4>Ninety-six infected and 15 control ... Read more >>

Vet Clin Pathol (Veterinary clinical pathology)
[2015, 44(4):493-497]

Cited: 7 times

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Serum canine pancreatic-specific lipase concentrations in dogs with naturally occurring Babesia rossi infection.

Liza S Köster, Jörg M Steiner, Jan S Suchodolski, Johan P Schoeman,

Babesia rossi is the cause of a highly virulent multisystemic disease with a variable outcome, which is a reliable model of systemic inflammatory response syndrome (SIRS). The objective of this study was to determine the concentration of canine pancreatic-specific lipase (cPL) in a population of dogs with naturally acquired B. ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2015, 86(1):E1-7]

Cited: 4 times

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Congenital hypothyroidism and concurrent renal insufficiency in a kitten.

Chee Kin Lim, Chantal T Rosa, Yolanda de Witt, Johan P Schoeman,

A 3-month-old male domestic short-hair kitten was presented with chronic constipation and disproportionate dwarfism. Radiographs of the long bones and spine revealed delayed epiphyseal ossification and epiphyseal dysgenesis. Diagnosis of congenital primary hypothyroidism was confirmed by low serum total thyroxine and high thyroid stimulating hormone concentrations. Appropriate supplementation of levothyroxine ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2014, 85(1):1144]

Cited: 3 times

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Worldwide prevalence and risk factors for feline hyperthyroidism: A review.

Joanne L McLean, Remo G Lobetti, Johan P Schoeman,

Since first reported in the late 1970s, there has been a steady but dramatic increase in the worldwide prevalence of hyperthyroidism in cats. It is now regarded as the most common feline endocrine disorder, with diabetes mellitus coming a close second. Not only is there evidence for an increased worldwide prevalence of feline ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2014, 85(1):1097]

Cited: 10 times

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Achieving population-level immunity to rabies in free-roaming dogs in Africa and Asia.

Michelle K Morters, Trevelyan J McKinley, Daniel L Horton, Sarah Cleaveland, Johan P Schoeman, Olivier Restif, Helen R Whay, Amelia Goddard, Anthony R Fooks, I Made Damriyasa, James L N Wood,

Canine rabies can be effectively controlled by vaccination with readily available, high-quality vaccines. These vaccines should provide protection from challenge in healthy dogs, for the claimed period, for duration of immunity, which is often two or three years. It has been suggested that, in free-roaming dog populations where rabies is ... Read more >>

PLoS Negl Trop Dis (PLoS neglected tropical diseases)
[2014, 8(11):e3160]

Cited: 25 times

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Hemostatic analysis of dogs naturally envenomed by the African puffadder (Bitis arietans) and snouted cobra (Naja annulifera).

Susanna S Nagel, Johan P Schoeman, Peter N Thompson, Bo Wiinberg, Amelia Goddard,

<h4>Objective</h4>To investigate hemostatic changes in dogs envenomed by cytotoxic (African puffadder) and neurotoxic snakes (snouted cobra) using thromboelastography (TEG) and plasma-based coagulation assays.<h4>Design</h4>Prospective observational clinical study.<h4>Setting</h4>University teaching hospital.<h4>Animals</h4>Eighteen client-owned dogs; 9 envenomed by African puffadder (Bitis arietans) and 9 by snouted cobra (Naja annulifera). Ten healthy dogs served as controls.<h4>Interventions</h4>None.<h4>Measurements ... Read more >>

J Vet Emerg Crit Care (San Antonio) (Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001))
[2014, 24(6):662-671]

Cited: 4 times

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The central role of chloride in the metabolic acid-base changes in canine parvoviral enteritis.

Richard K Burchell, Johan P Schoeman, Andrew L Leisewitz,

The acid-base disturbances in canine parvoviral (CPV) enteritis are not well described. In addition, the mechanisms causing these perturbations have not been fully elucidated. The purpose of the present study was to assess acid-base changes in puppies suffering from CPV enteritis, using a modified strong ion model (SIM). The hypothesis ... Read more >>

Vet J (Veterinary journal (London, England : 1997))
[2014, 200(1):152-156]

Cited: 4 times

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Advances in the understanding of the pathogenesis, progression and diagnosis of myxomatous mitral valve disease in dogs.

Richard K Burchell, Johan P Schoeman,

A number of key questions remain unanswered in the pathogenesis of myxomatous mitralvalve disease (MMVD). As MMVD typically afflicts small-breed dogs, a genetic basis hasbeen implied. In addition, the fact that not all dogs within a risk group develop MMVDis still unexplained. Research into the pathogenesis of MMVD typically falls ... Read more >>

J S Afr Vet Assoc (Journal of the South African Veterinary Association)
[2014, 85(1):e1-e5]

Cited: 0 times

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Myocardial injury in dogs with snake envenomation and its relation to systemic inflammation.

Rebecca Langhorn, Frida Persson, Björn Ablad, Amelia Goddard, Johan P Schoeman, Jakob L Willesen, Inge Tarnow, Mads Kjelgaard-Hansen,

<h4>Objective</h4>To investigate the presence of myocardial injury in dogs hospitalized for snake envenomation and to examine its relationship with systemic inflammation.<h4>Design</h4>Prospective case-control study.<h4>Setting</h4>University teaching hospital and small animal referral hospital.<h4>Animals</h4>Dogs naturally envenomed by the European viper (Vipera berus; n = 24), African puff adder (Bitis arietans; n = 5), or ... Read more >>

J Vet Emerg Crit Care (San Antonio) (Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001))
[2014, 24(2):174-181]

Cited: 12 times

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Population structure and genetic heterogeneity in popular dog breeds in the UK.

Richard J Mellanby, Rob Ogden, Dylan N Clements, Anne T French, Adam G Gow, Roger Powell, Brendan Corcoran, Johan P Schoeman, Kim M Summers,

There is increasing concern that reproductive isolation related to breed specifications in dogs, while maintaining genetic differences among breeds, is likely to promote breed-specific genetic disorders. This study examined genetic diversity among 13 popular dog breed groups in the UK. Most breeds showed high levels of homozygosity when compared with ... Read more >>

Vet J (Veterinary journal (London, England : 1997))
[2013, 196(1):92-97]

Cited: 27 times

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