I just wanted to make an observation to Tory Shade's comment, which is
that for tens of thousands of malaria infested and other humid tropical and
sub-tropical dwellers, it is not the ingestion of Chloroquin et alia, but
vitamin B which does the repelling of mosquitoes. I do not know how effective
it actually is in rational terms (numbers); nevetheless it seems to work for
all these and other visitors. This would seem to concur with your what Tory
is saying.
Rodrigo Hernandez
UBC - Vancouver //----------------------------------------------------------------------------