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Browsing South African National Veterinary Repository by Author "Alexander, R.A."
Now showing items 1-20 of 29
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Alexander, R.A.; Du Toit, P.J. (Pretoria : The Government Printer, 1948)(1) The history of horsesickness in Egypt and Palestine is traced. (2) It is believed that the 1944 epizootic was started in Egypt by the introduction of one or more infected equines into the Komombo area from the South ...
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Alexander, R.A.; Haig, D.A.; Adelaar, T.F.; Du Toit, P.J. (Pretoria : The Government Printer, 1947)1. A strain of virus (University Farm strain) was adapted to propagation in the developing chick embryo by incubation of infected eggs containing 8 day embryos at 33.6°C. but not at 32.1°C., 35.0°C. or 38.2°C. 2. ...
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Weiss, K.E.; Haig, D.A.; Alexander, R.A.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1952)1. The value of aureomycin in the treatment of heartwater has been established. It is considerably more effective than the sulphonamides. 2. The minimal therapeutic dose for sheep appears to be 2•5 mg. per lb. administered ...
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Haig, D.A.; McKercher, D.G.; Alexander, R.A.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1956)Cytopathogenic activity by egg adapted strains of bluetongue virus for sheep kidney cells in culture, and the neutralization of this activity by homologous antiserum are described. The possible applications of this ...
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Neitz, W.O.; Alexander, R.A.; Du Toit, Peet J.; Union of South Africa. Dept. of Agriculture (Union of South Africa : Dept. of Agriculture, 1934)A brief review of a portion of the literature on Bartonella, Grahamella and Eperythrozoon is given. A new species of blood parasite of sheep is described for which the name Eperythrozoon ovis is proposed. The symptomatology ...
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Alexander, R.A.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1958)
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Mason, J.H.; Alexander, R.A.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Union of South Africa : Dept. of Agriculture, 1934)
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Alexander, R.A.; Neitz, W.O.; Du Toit, P.J.; Du Toit, P.J. (Pretoria : The Government Printer, 1936)1. Details of the method adopted for the preparation of the vaccine are given. 2. The results obtained in the field during the season 1934-35 with the immunization of 1,815 police remounts and 28,659 other horses and ...
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Neitz, W.O.; Alexander, R.A.; Du Toit, P.J. (Published by The Government Printer, Pretoria, 1945)1. A record of the number of cases of tick-borne diseases in a herd of adult cattle rather less than 1,000 in number over a period of four years is given, viz., 8 cases of anaplasmosis of which 3 were fatal, 9 of redwater ...
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Du Toit, P.J.; Alexander, R.A.; Neitz, W.O.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Pretoria : Union of South Africa, Dept. of Agriculture, 1933)(1) The antigenic value of individual spleens varies greatly. (2) The product of several pooled spleens is more potent than that obtained from a single spleen. (3) The potency of different batches of pooled spleens ...
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Alexander, R.A.; Du Toit, P.J.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Union of South Africa : Dept. of Agriculture, 1934)Details of the results obtained from the injection of horses and mules with neurotropic mouse and guinea pig adapted virus are given. It is shown that the virulence of horsesickness virus progressively decreases for equines ...
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Du Toit, P.J.; Alexander, R.A.; Neitz, W.O.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Union of South Africa : Dept. of Agriculture, 1933)In a previous communication [this Bull. 3. 538.] it was shown that mules could be protected against horsesickness by a suitable formalinized vaccine. Further work has confirmed these results and indicated that a spleen ...
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McIntosh, B.M.; Haig, D.A.; Alexander, R.A.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1954)From infected material obtained from various herds virus has been isolated in several instances in developing hen's eggs, and in one instance also in mice. The strain which could be propagated in both mice and eggs was ...
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Alexander, R.A.; Du Toit, P.J. (Pretoria : The Government Printer, 1947)1. The technique used for the propagation of the Bekker strain of bluetongue virus in the developing chick embryo is described in detail. 2. The important role played by the temperature of incubation on the multiplication ...
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Alexander, R.A.; Mason, J.H.; Neitz, W.O.; Du Toit, P.J. (The Government Printer, Pretoria, 1939)Research work into heartwater, a disease of sheep, goats and cattle caused by Rickettsia ruminantium (Cowdry 1926) has been hampered to a very great extent by the lack of a susceptible small laboratory animal. Up to the ...
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Alexander, R.A.; Mason, J.H.; Du Toit, P.J. (The Government Printer, Pretoria, 1939)In the previous article (this journal) details were given of the source and method of isolation of five strains of rickettsia. These strains have been maintained either by serial passage in guinea pigs, or by cultivation ...
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Mason, J.H.; Alexander, R.A.; Du Toit, P.J. (The Government Printer, Pretoria, 1939)1. The effect of the rickettsias of rat typhus, tick-bite fever, fievre boutonneuse, and of two other tick-bite-fever-like diseases (" Hare " and "Appleton ") on the guinea-pig, rat, mouse, rabbit, dog, sheep, and ox is ...
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Mason, J.H.; Alexander, R.A.; Du Toit, P.J. (Pretoria : The Government Printer, 1939)1.The five strains of rickettsia are discussed and compared according to the criteria suggested by Pinkerton (1936). 2. It· is concluded that they fall into two groups: (a) Typhus group – endemic, murine or rat ...
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Neitz, W.O.; Alexander, R.A.; Adelaar, T.F.; Du Toit, P.J. (Pretoria : The Government Printer, 1947)1. It has been confirmed that the immunity in sheep following recovery from infection comprises a short period of premunition, followed by a period of gradually decreasing sterile immunity. 2. Infection during the period ...
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Alexander, R.A.; Du Toit, P.J. (Pretoria : Government Printer, 1935)
Now showing items 1-20 of 29