The periodicity of Brugia malayi in South Thailand.

ABSTRACT

The periodicity of Brugia malayi microfilariae were studied in the two endemic areas of the South Thailand i.e. in Pattani and Narathiwat provinces. It was found that in Pattani province the microfilariae had a markedly nocturnal periodicity character while in Narathiwat province they were of a nocturnal sub-periodic type. Moreover, the microfilariae of periodic form in Giemsa stained blood films usually had "unsheathed" appearance (71.5%), while those of sub-periodic type were mostly of "sheathed" form (93.4%).