The periodicity of microfilariae: VI. The response of microfilariae of Wuchereria malayi and W. bancrofti, pacific type, to various stimuli

1. (1) An investigation was made of the effect of various stimuli upon the microfilarial count of Wuchereria malayi (periodic) and of W. bancrofti Pacific type (non-periodic). 2. (2) The response of W. malayi was similar to that of African W. bancrofti previously studied, viz. a fall in number with increased oxygen and with muscular exercise, and no marked change with increased carbon dioxide. 3. (3) The response of the non-periodic Pacific type of W. bancrofti differed from that of the periodic African W. bancrofti in that increased oxygen caused a slight rise of the microfilarial count instead of a marked fall.