Walter Reed (1851-1902) was the professor of bacteriology of a U.S. army medicine school, when yellow fever had become a serious problem in 1898 age Cuba, he became the cause and person in charge of the investigating committee about propagation, and the human body experiment proved Reed the opinion of Finlay.

William Crawford Gorgus (1854-1920) is an American, and he destroyed the breeding ground of the mosquito in Havana from 1898 to 1902, proved by Read Walter to be the medium of yellow fever, and he improved healthy health conditions, and he became famous. After that, jipijapa also accomplished the distinguished services same as a health chief of the Panama Canal committee, and enabled canal construction.

Hideyo Noguchi (1876-1928) was born to Fukushima Prefecture, after he passed the medical practitioner examination, he went into the infectious disease research institute, and he studied bacteriology. Although research of yellow fever was started from 1913, an official trip was taken to Accra in Africa in 1927, and, also himself, it infected and fell on yellow fever during research.

Ozwald Cruz (1872-1917) is a bacteriologist and a doctor, and was rendered to the public health of Brazil. From Rio de Janeiro, movement which loses yellow fever was begun and it ended with the sufficient result by 1909 at the beginning of 1900. Moreover, the line plague was lost from Rio de Janeiro and it succeeded also in reducing the victim of smallpox.