Browsing Veterinary Science by UP Author "Grewar, John Duncan"

Browsing Veterinary Science by UP Author "Grewar, John Duncan"

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  • The 2011 outbreak of African horse sickness in the African horse sickness controlled area in South Africa 
    Grewar, John Duncan; Weyer, Camilla Theresa; Guthrie, Alan John; Koen, Pieter; Davey, Sewellyn; Quan, Melvyn; Visser, Dawid; Rossouw, Esthea; Buhrmann, Gary (OpenJournals Publishing, 2013-11-15)
    African horse sickness (AHS) is a controlled animal disease in South Africa, and as a result of the high mortality rates experienced, outbreaks in the AHS controlled area in the Western Cape Province have a significant ...
  • Annual ryegrass toxicity in thoroughbred horses in Ceres in the Western Cape Province, South Africa 
    Grewar, John Duncan; Allen, J.G.; Guthrie, Alan John (South African Veterinary Association, 2009-12)
    An outbreak of annual ryegrass toxicity occurred on a Thoroughbred stud in Ceres in the Western Cape Province of South Africa. This is the 1st report of annual ryegrass toxicity in horses in South Africa, although the ...
  • An entry risk assessment of African horse sickness virus into the controlled area of South Africa through the legal movement of equids 
    Grewar, John Duncan; Kotze, Johann L.; Parker, Beverly J.; Van Helden, Lesley S.; Weyer, Camilla Theresa (Public Library of Science, 2021-05)
    South Africa is endemic for African horse sickness (AHS), an important health and tradesensitive disease of equids. The country is zoned with movement control measures facilitating an AHS-free controlled area in the ...
  • Equine encephalosis in Thoroughbred foals on a South African stud farm 
    Grewar, John Duncan; Thompson, P.N. (Peter N.); Lourens, Carina W.; Guthrie, Alan John (AOSIS OpenJournals, 2015-09-30)
    Thoroughbred foal body temperature data were collected from shortly after birth until shortly after weaning during the 2007/2008 season on a stud farm in the Western Cape Province of South Africa. Equine encephalosis ...
  • Establishing post‐outbreak freedom from African horse sickness virus in South Africa's surveillance zone 
    Grewar, John Duncan; Sergeant, Evan S.; Weyer, Camilla Theresa; Van Helden, Lesley Susan; Parker, Beverley Joan; Anthony, Tasneem; Thompson, P.N. (Peter N.) (Wiley, 2019-11)
    An African horse sickness (AHS) outbreak occurred in South Africa's AHS controlled area in autumn 2016. A freedom from disease survey was performed to establish the likelihood of ongoing circulation of the associated virus ...
  • Experimental infection of ostriches with H7N1 low pathogenic and H5N8 clade 2.3.4.4B highly pathogenic influenza A viruses 
    Abolnik, Celia; Ostmann, Erich; Woods, Matthew; Wandrag, D.B.R. (Daniel); Grewar, John Duncan; Roberts, Laura Christl; Olivier, Adriaan J. (Elsevier, 2021-12)
    Please read abstract in the article.
  • A field investigation of an African horse sickness outbreak in the controlled area of South Africa in 2016 
    Grewar, John Duncan; Weyer, Camilla Theresa; Venter, Gert Johannes; Van Helden, Lesley Susan; Burger, Phillippa; Guthrie, Alan John; Coetzee, Peter; Labuschagne, Karien; Buhrmann, Gary; Parker, Beverley Joan; Thompson, P.N. (Peter N.) (Wiley, 2019-03)
    An outbreak of African horse sickness (AHS) caused by AHS virus type 1 occurred within the South African AHS surveillance zone during April and May 2016. The index case was detected by a private veterinarian through passive ...
  • Modelling the factors affecting the probability for local rabies elimination by strategic control 
    Kotze, Johann L.; Grewar, John Duncan; Anderson, Aaron (Public Library of Science, 2021-03)
    Dog rabies has been recognized from ancient times and remains widespread across the developing world with an estimated 59,000 people dying annually from the disease. In 2011 a tri-partite alliance consisting of the OIE, ...
  • The molecular epidemiology of clade 2.3.4.4B H5N1 high pathogenicity avian influenza in Southern Africa, 2021–2022 
    Abolnik, Celia; Phiri, Thandeka Precious; Peyrot, Belinda; De Beer, Renee; Snyman, Albert; Roberts, David; Ludynia, Katrin; Jordaan, Frances; Maartens, Michele; Ismail, Zehaad; Strydom, Christine; Van der Zel, Gerbrand; Anthony, Jade; Daniell, Nadine; De Boni, Liesl; Grewar, John Duncan; Olivier, Adriaan; Roberts, Laura C. (MDPI, 2023-06-16)
    In southern Africa, clade 2.3.4.4B H5N1 high pathogenicity avian influenza (HPAI) was first detected in South African (SA) poultry in April 2021, followed by outbreaks in poultry or wild birds in Lesotho and Botswana. ...
  • Novel Hendra virus variant detected by sentinel surveillance of horses in Australia 
    Annand, Edward J.; Horsburgh, Bethany A.; Xu, Kai; Reid, Peter A.; Poole, Ben; De Kantzow, Maximillian C.; Brown, Nicole; Tweedie, Alison; Michie, Michelle; Grewar, John Duncan; Jackson, Anne E.; Singanallur, Nagendrakumar B.; Plain, Karren M.; Kim, Karan; Tachedjian, Mary; Van der Heide, Brenda; Crameri, Sandra; Williams, David T.; Secombe, Cristy; Laing, Eric D.; Sterling, Spencer; Yan, Lianying; Jackson, Louise; Jones, Cheryl; Plowright, Raina K.; Peel, Alison J.; Breed, Andrew C.; Diallo, Ibrahim; Dhand, Navneet K.; Britton, Philip N.; Broder, Christopher C.; Smith, Ina; Eden, John-Sebastian (Centers for Disease Control and Prevention, 2022-03)
    We identifi ed and isolated a novel Hendra virus (HeV) variant not detected by routine testing from a horse in Queensland, Australia, that died from acute illness with signs consistent with HeV infection. Using ...
  • Post-outbreak African horse sickness surveillance : a scenario tree evaluation in South Africa’s controlled area 
    Grewar, John Duncan; Porphyre, Thibaud; Sergeant, Evan S.; Weyer, Camilla Theresa; Thompson, P.N. (Peter N.) (Wiley, 2020-04)
    An African horse sickness (AHS) outbreak occurred in March and April 2016 in the controlled area of South Africa. This extended an existing trade suspension of live equids from South Africa to the European Union. In the ...
  • A social–ecological approach to landscape epidemiology : geographic variation and avian influenza 
    Cumming, Graeme S.; Abolnik, Celia; Caron, Alexandre; Gaidet, Nicolas; Grewar, John Duncan; Hellard, Eleonore; Henry, Dominic A. W.; Reynolds, Chevonne (Springer, 2015-07)
    Context Landscape structure influences host–parasite–pathogen dynamics at multiple scales in space and time. Landscape epidemiology, which connects disease ecol-ogy and landscape ecology, is still an emerging field. ...