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A victim of yellow fever who recovers is immune for life, and the
vaccine now used in immunization is also considered an effective
preventive by a majority of the medical profession.

A great debt is owned by humanity to a small group of scientists-
martyrs who lost their lives in the courageous fight against yellow fever.
These men were Doctors Aristides Agramonte, Adrian Stokes, Hideyo
Noguchi, William A. Young, Paul A. Lewis, Theodore B. Hayne, A
Maurice Wakeman and J. W. Lazear. Twenty-seven other researchers
and experimenters were accidentally infected but recovered. (17)