Well here's my 2 cents worth, According to the standard explanation...
 
Terramycin cannot "control" AFB.  Terramycin prevents the larvae from
getting AFB.  AFB is bacterial and spread by microscopic spores.
Terramycin will not affect the spores. Use of Terramycin in a colony with
AFB, will reduce the symptoms, and may appear to "eliminate" the problem.
But, I wouldn't bet my colony and the other colonies in that yard on it.
 
Foulbrood is still out there, even though we are concentrating on mites...
Grins, John
 
John A. Skinner           218 Ellington Hall
Extension Apiculturist    University of Tennessee
[log in to unmask]          Knoxville, TN  37901   (423)974-7138
 
 
On Thu, 22 Aug 1996, Bill Miller wrote:
 
> Can Terramycin pemanently clear up AFB?
>
> Well, in discussions with our State Apiary Inspectors, they have only known
> one hive where Terramycin cleared up the disease to the point when no further
> treatment was needed.   The general rule is that while Terramycin will
> control AFB, it won't cure it.   If you start in with Terramycin on an AFB
> hive, the disease will normally reappear right after you stop treating.
>
> W. G. Miller
> Gaithersburg, MD
>