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Experimental Malaria Infections in A. Stephensi from Contrasting Sea-Water and Tap-Water Larva Environments¹

1. A. stephensi (type) females emerging from tap-water became infected with sporozoites of P. falciparum Welch, 1897, from suitable gametocyte carriers up to as high a rate as 71.2 per cent, with an average sporozoite index of 27.1 per cent in 221 dissections.

2. A. stephensi (type) females emerging from brackish water, up to 80 per cent of sea-water, became infected with sporozoites of P. falciparum from the same gametocyte carriers up to as high a rate as 81.6 per cent, with an average sporozoite index of 31.9 per cent in 298 dissections.

Received September 21, 1940.
¹ These studies were made with the support and under the auspices of the International Health Division of The Rockefeller Foundation co-operating with the King Institute of Preventive Medicine, Guindy, Madras, and with the Health Department of Madras Presidency.