Mike, what part of the country are you in, and what do you treat with
tetramycin as a preventitive? If you were here in our area I would harvest
the honey (I assume you've already used your extracting equipment with
these hives and they have already been exposed to AFB) and then pull out
and destroy infected comb. Then I would immediately treat with tetramycin.
It doesn't get better with time, and if you wait for the honey flow to end
that will be too long. But first check the archives here or with an
experienced beekeeper to be sure it's AFB and not something similar that
is often associated with mites. Correctly identifying the problem is of
course your first priority.

Please let us know what you find, and best of luck.

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