Gertrud Theiler Prize in Physiology or Medicine for development of the yellow fever vaccine. Gertrud Theiler Gertrud Theiler (11 September 1897 – 2 May 1986) was a South African parasitologist and teacher most noted for her work with nematodes and ticks. Born on 11 September 1897 in Pretoria, South Africa, Theiler graduated from Pretoria Girls’ High School and spent a year at Rhodes University College in Grahamstown, South Africa, before transferring to South African College in Cape Town, where she graduated in 1918 with a Bachelor of Science degree. She went to Europe to undertake postgraduate work in helminthology at the University
Theiler's disease multiple horses over several months. In the Northern hemisphere it is most common between August to November. It is seen almost exclusively in adult horses, and lactating broodmares given tetanus antitoxin post foaling may be more susceptible. This disease was described in 1919 by Arnold Theiler, a South African veterinary surgeon, after vaccinating horses against African horse sickness using a live virus vaccine and equine antiserum. It was later described in the United States after vaccinating horses for Eastern Equine Encephalitis, again using live virus vaccines and equine-derived antiserum. It has since been reported throughout North America and Europe. Theiler's