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Helena C. Steyn

Observed names: H C Steyn, H. C. STEYN, H. C. Steyn, H. Steyn, H.C Steyn, H.C. Steyn, HELENA STEYN, Helena Steyn
ORCID: 0000-0002-5065-5510
Observed ORCID: 0000-0002-5065-5510
OpenAlex ID: A5080107216
The genome of the heartwater agent Ehrlichia ruminantium contains multiple tandem repeats of actively variable copy number
2005 · Nicola E. Collins, Junita Liebenberg, et al. · Proceedings of the National Academy of Sciences · 165
A quantitative real-time PCR assay for Ehrlichia ruminantium using pCS20
2008 · H.C. Steyn, A. Pretorius, et al. · Veterinary Microbiology · 54
The epidemiology of tick-borne haemoparasites as determined by the reverse line blot hybridization assay in an intensively studied cohort of calves in western Kenya
2015 · Nyawira E. Njiiri, B. Mark deC. Bronsvoort, et al. · Veterinary Parasitology · 51
Molecular investigation of tick-borne haemoparasite infections among transhumant zebu cattle in Karamoja Region, Uganda
2016 · Charles Byaruhanga, Nicola E. Collins, et al. · Veterinary Parasitology Regional Studies and Reports · 50
Characterization of the pCS20 region of different Ehrlichia ruminantium isolates
2004 · H. Van Heerden, H.C. Steyn, et al. · Veterinary Microbiology · 42
Protection against heartwater by DNA immunisation with four Ehrlichia ruminantium open reading frames
2006 · A. Pretorius, N.E. Collins, et al. · Vaccine · 32
Salmonella isolated from crocodiles and other reptiles during the period 1985-1994 in South Africa.
1997 · M L van der Walt, F W Huchzermeyer, et al. · PubMed · 31
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Phylogenetic Relationships among Ehrlichia ruminantium Isolates
2003 · M.T. E.P. ALLSOPP, H. VAN HEERDEN, et al. · Annals of the New York Academy of Sciences · 28
Ticks and tick-borne pathogens infecting livestock and dogs in Tchicala-Tcholoanga, Huambo Province, Angola
2021 · Gourgélia Sili, Charles Byaruhanga, et al. · Parasitology Research · 27
In vitro and in vivo evaluation of five low molecular weight proteins of Ehrlichia ruminantium as potential vaccine components
2010 · S.I. Sebatjane, A. Pretorius, et al. · Veterinary Immunology and Immunopathology · 22
Experimental use of the attenuated Ehrlichia ruminantium (Welgevonden) vaccine in Merino sheep and Angora goats
2008 · Erich Zweygarth, Antoinette I. Josemans, et al. · Vaccine · 21
Salmonella isolated from feeds and feed ingredients during the period 1982-1988: animal and public health implications.
1990 · A M Durand, W H Giesecke, et al. · PubMed · 16
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In vitro cultivation of a south African isolate of an Anaplasma sp. in tick cell cultures.
2006 · E Zweygarth, A I Josemans, et al. · PubMed · 12
Safety and efficacy of an attenuated heartwater (Ehrlichia ruminantium) vaccine administered by the intramuscular route in cattle, sheep and Angora goats
2020 · Abdalla A. Latif, Helena C. Steyn, et al. · Vaccine · 11
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A multi-epitope DNA vaccine co-administered with monophosphoryl lipid A adjuvant provides protection against tick transmitted Ehrlichia ruminantium in sheep
2019 · S.I. Tshilwane, N. Thema, et al. · Vaccine · 10
Innate immune transcriptomic evaluation of PBMC isolated from sheep after infection with E. ruminantium Welgevonden strain
2017 · T. Nefefe, J. Liebenberg, et al. · Molecular Immunology · 10
Characterisation of South African field Ehrlichia ruminantium using multilocus sequence typing
2023 · Zinathi Dlamkile, Luis Neves, et al. · Onderstepoort Journal of Veterinary Research · 9
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Identification and characterisation of conserved epitopes of E. ruminantium that activate Th1 CD4+ T cells: Towards the development of a multi-epitope vaccine
2019 · N. Thema, S.I. Tshilwane, et al. · Molecular Immunology · 9
Genetic diversity of Ehrlichia ruminantium field strains from selected farms in South Africa
2020 · Helena C. Steyn, Alri Pretorius · Onderstepoort Journal of Veterinary Research · 8
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Veterinary extension on sampling techniques related to heartwater research
2010 · H.C. Steyn, C.M.E. McCrindle, et al. · Journal of the South African Veterinary Association · 8
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Variability of pCS20 Gene Sequences among Different Ehrlichia ruminantium Isolates
2003 · H. C. STEYN, H. VAN HEERDEN, et al. · Annals of the New York Academy of Sciences · 8
A Molecular Epidemiologic Investigation of Acinonyx Jubatus)
2003 · Estelle H. Venter, Moritz van Vuuren, et al. · Journal of Zoo and Wildlife Medicine · 8
Screening for immune biomarkers associated with infection or protection against Ehrlichia ruminantium by RNA-sequencing analysis
2024 · A. Pretorius, T. Nefefe, et al. · Microbial Pathogenesis · 7
Cellular immune responses induced in vitro by Ehrlichia ruminantium secreted proteins and identification of vaccine candidate peptides
2016 · Nontobeko Thema, Alri Pretorius, et al. · Onderstepoort Journal of Veterinary Research · 7
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The biochemical differentiation between Salmonella and Citrobacter.
1989 · M L van der Walt, H C Steyn · PubMed · 7
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Works count: 38
Citation count: 681
H-index: 12
I10-index: 16
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