Work was begun at once. Fortunately for our purpose, an
epidemic of yellow fever existed in the town of Quemados, in
close proximity to the military reservation of Camp Columbia.
Even before the arrival of Reed and Carroll, Lazear and I had
been studying its spread, following the cases very closely;
subsequently a few autopsies were made by me, Carroll making
cultures from the various tissues and Lazear securing fragments
for microscopical examination; a careful record was kept and
the results noted; cases gradually became less in number as the
epidemic slowly died out, about the middle of August.
