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A combination of population growth, public health failures,
environmental degradation and rapid global transportation has
resulted in a world that is at increasing risk to vectorborne and
other infectious diseases. A large percentage of emerging diseases
are vectorborne and over one-third of the agents on the list of
greatest concern from bioterrorism are vectorborne. Many of these
diseases are viral that have no effective drug or vaccine
treatments. Drug and insecticide resistance is now common and has
greatly compromised our ability to provide effective and affordable
control. Parasitic diseases, including malaria, leishmmaniasis and
African trypanosomiasis are likewise increasing in many parts of
the world. Control programs for onchocerciasis and to some extent
filariasis are reducing the impact of these diseases, largely due
to the availability of filaricides such as ivermectin. Chagas
disease has also declined significantly through home improvements
and indoor insecticide application against the domicilary kissing
bug vectors.
One of the fundamental concepts of toxicology is that chemicals act at selective receptors and that such interactions result in phar macologic responses which, depending on dose, mayor may not result in toxicity. For us to understand how insecticides produce their toxic effects, we must first understand their molecular interactions with their target receptors. With this in mind, we organized a symposium which was given in conjunction with the XVII International Congress of Entomology in Hamburg on August 21, 1984. The goal of this symposium was to bring together researchers with a wide range of expertise who shared a common interest in the action of insecticides on the insect nervous system. It was decided to restrict the scope of the symposium so that selected topics could be discussed in greater depth. The volume which resulted from this symposium, -Membranes Receptors and Enzymes as Targets of Insecticidal Action-, details a number of bio chemical modes of action of insecticides on the insect nervous system. The volume is divided into two sections; the first dealing with the action of insecticides on the GABA-ch1oride channel complex. This section evolves from a discussion of the symptoms of cyclodiene toxicity presented by Dr. D. E. Woolley, to the structure-activity relationships and pharmacology of the channel complex and is concluded with the extremely interesting work of Dr. C. C. Wang on the action(s) of avermectin at this receptor.
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