Needed - Just one precedent

Martin Hewlett marty_hewlett at TIKAL.BIOSCI.ARIZONA.EDU
Wed Oct 11 15:13:34 EST 1995


An example of a virus transmitted mechanically is Equine Infectious 
Anemia virus (a retrovirus/lentivirus).  Transmission is from horse to 
horse via a Tabanid fly.  In this case, the biting of the fly is 
irritating and the horse tries to brush it away.  The fly then goes on 
to the next horse, transmitting a bit of the blood of the first host in 
the process.  The virus does not replicate in the fly (see Fields 
"Virology", Chapter 55, page 1579).

In addition, many arboviruses (such as LaCrosse encephalitis virus) can 
be transmitted from one vertebrate host to another by mechanical means 
during interrupted feeding.  In this case, this is a minor pathway, 
since these viruses replicate quite well in their arthropod hosts.

Martin Hewlett, Ph.D.
Department of Molecular and Cellular Biology
University of Arizona
Tucson, Arizona

*******  Contemplare, et contemplata aliis tradere *******





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