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Several factors made control of yellow fever difficult. Prior to the early 1900s, it was not generally understood that yellow fever was transmitted not by person-to-person contact, but by mosquitoes. The first scientific evidence that yellow fever was transmitted by mosquitoes was obtained by Cuban physician and scientist [[Wikipedia:Carlos Finlay|Carlos Finlay]] in 1881, but his research was not generally accepted until a team lead by [[Wikipedia:Walter Reed|Walter Reed]] reached the same conclusion in 1901.
There was no effective treatment for yellow fever. Even today, treatment in symptomatic and supportive only. The first vaccine was not developed until 1937<ref>"Yellow Fever" http://en.wikipedia.org/wiki/Yellow_fever</ref>.
==Yellow fever epidemics in Pensacola==