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A Note on Filariasis among the Natives of Okinawa, with Particular Reference to Possible Transmission of Wuchereria Bancrofti by Anopheles Hyrcanus Sinensis¹

Filariasis due to Wuchereria bancrofti (Cobbold) is endemic on Okinawa and available evidence indicates its probable presence throughout the southern Ryukyu Islands (1, 2). The infection is characterized by a high degree of nocturnal microfilarial periodicity, with the greatest density of microfilariae appearing in the peripheral blood between 8:00 p.m. and 4:00 a.m. (1000 to 0400) (3, 4, 5). The incidence of microfilaremia in the native population of Okinawa during the period April through July, 1945, as determined by examination of thick blood films or by the Knott concentration technique (6), was found to range from approximately ten to thirty percent in various groups (4, 5, 7). In general inhabitants of the rural districts were reported to show a higher incidence of microfilaremia than observed in groups of civilians evacuated from relatively urban areas in the southern part of the island.

¹ The opinions or assertions expressed herein are the private ones of the writer and are not to be construed as official or reflecting the views of the Navy Department or the Naval Service at large.

² Department of Preventive Medicine, Bowman Gray School of Medicine of Wake Forest College, Winston-Salem, North Carolina. Formerly Lieut., MC, USN, attached to U. S. Naval Military Government Hospital G-6 (51), Okinawa, and U. S. Naval Medical Research Unit No. 2, Guam, at the time of the observations reported in the present communication.