a.Four different methods of malaria control were tested under field conditions in four separate towns in a tropical country where original incidence of malaria, as measured by splenic and blood findings, was highly comparable.
b.The incidence of malaria in all of the towns was severe to hyperendemic.
c.Meteorological factors were highly comparable in the towns, if they cannot be classified as identical. All towns were situated on the coastline within fifteen miles of one another.
d.Three surveys were performed in the towns over the period of nine months before any control was instituted, to serve, together with a comparison town, as a baseline from which to measure results.
e.All control was begun at the same time following the third survey of December 1945.
f.Subsequent surveys following the initiation of control procedures, were performed at the identical time of the year as those performed during the first nine months of observation.
At time of study Colonel, MC, Commandant Army School of Malariology; at present director for Colombia, S. A. for activities of the Rockefeller Foundation.
At time of study Captain, MC, A.U.S., Army School of Malariology.
At time of study 1st Lt., MC, A.U.S., Surgeon Office Panama Canal Dept.
At time of study Technical Sergeant, Med. Dept., A.U.S., Army School of Malariology.