Susceptibility to Brugia pahangi of geographical strains of Culex pipiens fatigans.

Five strains of Culex pipiens fatigans from Kuala Lumpur, Tanga, Bobo Dioulasso, Ibadan and Maracay were tested for susceptibility to Brugia pahangi. The mosquitoes were membrane-fed on infected blood in which the parasite density ranged from 1-3 to 20-4 mff/mm(3). The susceptibility rates were low, and were not directly related to the parasitaemia. If the susceptible individuals represent homozygotes for the gene sb (the gene controlling susceptibility to B pahangi in C. pipiens), the gene frequencies in the five strains were 0-33, 0-23, 0-28, 0-12 and 0-31 respectively.