Jay and Nancy Mone jaymone at PAONLINE.COM
Sat Jun 19 21:06:51 EST 1999

In order for a virus to be efficiently spread by a blood-sucking insect, 
a couple of things must be true:
(1)  The virus must be in high titer in the plasma for a substantial 
period of time.
(2)  The virus must use the arthropod host as an incubator, rather than 
simply as a vehicle.

HBV and HCV certainly do achieve high-titered, prolonged viremia, but 
once inside an arthropd vector, they don't survive.  This is probably due 
to the fact that the virus can't infect the insect's cells.

During most of the infectious cycle of HIV, high-titered viremia is not 
seen, and again, the virus is unable to survive in the arthropod.

Concerning Graham Shepherd's response, virtually everyone says that these 
viruses are not spread by any insects.  If they were, there would be no 
risk groups, since we would all be equally at risk of getting bitten.

Jay Mone'

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