On this day 126 years ago, January 30, 1899 (December 19, 1898), South African medical scientist Thiele was born in the United States. Thiele South Africa - American microbiologist. Born January 30, 1899 in Pretoria, South Africa; died August 11, 1972 in New Haven, Connecticut. In 1922 Thiele arrived in the United States and took a position at Harvard Medical School. In 1930 he transferred to the Rockefeller Foundation in New York. Tiller studied amoebic dysentery and rodent fever in his early years, then turned to yellow fever, and first developed a yellow fever vaccine, which achieved the treatment and prevention of yellow fever. In 1937, a safer vaccine was developed, which was obtained from a non-infectious strain of virus selected after about 200 transfers from one chicken embryo to another. This second vaccine became the standard vaccine in South America. Although Tiller still did not have a scientific title, he was awarded the 1951 Nobel Prize in Medicine and Physiology for his work.