If your method has sections in a coplin jar of carbol fuchsin in an oven at 
60ºC for an hour or so, then be aware that this technique has been shown to 
be a source of cross contamination.  It's unfortunate since it produces good 
stains.

Another source of contamination is the taps used for washing sections.  They 
can have a scale built up inside the vacuum trap.  The scale may be acid 
fast organisms.  Eliminate by changing the vacuum trap and regularly=20
cleaning the insides of the tap with a test tube brush.

Bryan Llewellyn


----- Original Message ----- 
From: 
To: 
Sent: Wednesday, April 06, 2005 10:34 AM
Subject: [Histonet] How to eliminate AFB contamination on slides?


> We are having problems with the AFB stain. Almost everything we do AFB
> stains on has extracellular "AFB positive organisms" without an associated
> tissue response. Do we need to change our stain or use better grade water?
> Anybody who has any ideas or suggestions or has had this problem in the
> past, let me know what you did to correct the problem. Thank you to all in
> advance.
>
>
>
> Heather A. Harper
>
> Supervisor of Histology/Morgue
>
> Naval Hospital of Pensacola, FL
>
> _______________________________________________
> Histonet mailing list
> Histonet@lists.utsouthwestern.edu
> http://lists.utsouthwestern.edu/mailman/listinfo/histonet
> 



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