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Further Observations on the Comparative Susceptibility of Nearctic and Neotropical Anophelines to Coindigenous Strains of Plasmodium Falciparum¹

Daniel M. Jobbins
Gorgas Memorial Institute, Panama City, Republic of Panama

The opportunity afforded by the acquirement of a strain of Plasmodium falciparum, evidently derived from the Republic of Panama, suggested the desirability of extending the studies on relative susceptibility already reported (1, 2).

The history of the patient from whom the strain was secured is as follows:

The patient, a white male aged 45, a forester by occupation, had been a resident of Pensacola, Florida, for the year prior to the events described. To his recollection he had never previously experienced any unexplained febrile illness, nor prior to the trip discussed, had ever been in the tropics. He left Pensacola by plane on March 28, 1938, for the Canal Zone, arriving March 30. A few days later he left on a trip to inspect timberlands in the interior of the Republic of Panama, in the course of which he was at the town of David on April 5, but did not spend the night at that place.

Received November 25, 1939.
¹ The studies and observations on which this paper is based were conducted with the support and under the auspices of the International Health Division of The Rockefeller Foundation, in cooperation with the Florida State Board of Health and the Florida State Hospital.

I wish to acknowledge the assistance received from Miss Persis Putnam in the statistical computations.