Browsing 1947 Onderstepoort Journal of Veterinary Science and Animal Industry, Volume 21, Number 2, 1947 by Author "Alexander, R.A."

Browsing 1947 Onderstepoort Journal of Veterinary Science and Animal Industry, Volume 21, Number 2, 1947 by Author "Alexander, R.A."

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  • The attenuation of bluetongue virus by serial passage through fertile eggs 
    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. ...
  • Studies on immunity in heartwater 
    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 ...