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Date: | Sun, 15 Mar 2009 13:15:29 EDT |
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To Gavin:
Selecting for the survivors (bees) of a viral infection may not produce the
result that you desire. Some viruses have many times higher levels of
inapparent (covert) infection than the patent infections that produce symptoms,
sometimes bee losses.
For some viruses, the bee survivors may be carriers. Some insect viruses
act like the bacteria that produces typhoid fever, where T. Mary was the
carrier. You want to eliminate the carrier colonies from the bee operation.
We're beginning to see that this may be possible - and not just by some type
of vaccination, but by taking the approach mentioned by Greg -- targeted
pathogen management AS A TOOL BUT NOT A TOTAL SOLUTION.
And before Bob H. jumps back in and says you can't do anything about viruses
- remember, previously you could not do much about a covert virus because
you did not know it was there, but that's not necessarily the case anymore.
Its possible to screen for viruses, including the covert ones, with
technologies available to beekeepers right now.
Preliminary information indicates that it is possible to manage to reduce or
eliminate the worst viruses - we're just beginning to see that happen in bee
operations that are trying to manage better with respect to reducing viral
loads.
Jerry
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