Yellow fever vaccine Foundation to improve the vaccine from the "Asibi" strain, discovered that a favorable chance mutation in the attenuated virus had produced a highly efficacious strain that was named 17D. After field trials in Brazil, over one million people were vaccinated by 1939, without severe complications. For his work on the yellow fever vaccine, Theiler received the 1951 Nobel Prize in Physiology or Medicine. Only the 17D vaccine remains in use today. The outbreak of yellow fever in Angola in January 2016 has raised concerns about whether the global supply of vaccine is adequate to meet the need during a large
Nobel Prize controversies the award despite his death, under the rule that allows awardees to receive the award who die between being named and the awards ceremony. The decision to award the 2010 Nobel Prize for Physiology or Medicine to Robert Edwards for developing the technique of in vitro fertilisation was bitterly denounced by the Catholic Church, which objects to all artificial methods of human conception and fertilization as well as to contraception. One Vatican official called the award "out of order", and the International Federation of Catholic Medical Associations issued a statement saying that the use of human embryos, created and discarded