Hideyo Noguchi
Following the death of Adrian Stokes of yellow fever in September 1927, it became increasingly evident that yellow fever was caused by a virus, and moreover that it could be transmitted not only by the bite of the mosquito but also by transmission through the skin if infected material was handled. This was contrary to the theories of Dr Hideyo Noguchi, a leading scientist with the Rockefeller Foundation, who believed the bacillus Leptospira icteroides was responsible.