Abstract
THE highest endemicity of filariasis in the Philippine Islands occurs in the extensive abaca-growing areas of the Bicol Peninsula, Samar, Leyte and Mindanao1. Here the principal vector is the plant-cavity breeding Aedes (Finlaya) poicilius (Theobald), which is able to exist in dense populations because the abundant rainfall keeps the leaf axils of the abaca trees filled with water1. In our survey of 1954–55 (ref. 2), we showed a general correlation between the presence of abaca and filarial endemicity, but there were two notable exceptions. One of these was in the northern mountain province of Luzon. Through the co-operation of the Malaria Eradication Unit stationed at Tabuk, we received a sample of night blood films which showed a 29 per cent microfilaraemia-rate.
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