Early Years
Oswaldo Gonçalves Cruz was born on August 5, 1872 in São Luis do Paraitinga, a small city in São Paulo State, to the physician Bento Gonçalvez Cruz and Amália Bulhões Cruz. Still a child, he moved to Rio de Janeiro with his family. At the age of 15 he started to study at the Faculty of Medicine of Rio de Janeiro and in 1892 he graduated as medical doctor with a thesis on water as vehicle for the propagation of microbes. Inspired by the great work of Louis Pasteur, who had developed the germ theory of disease, four years later he went to Paris to specialize in Bacteriology at the Pasteur Institute, which gathered the great names of this branch of science of that time. He was financed by his father-in-law, a wealthy Portuguese merchant.
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