[Histonet] Fite stain

Tony Henwood AnthonyH <@t> chw.edu.au
Wed Jun 11 18:19:39 CDT 2008

Your differentiation step is used in the classic ZN not a Fite.
This might just be a typo but shouldn't it be 1-3% sulphuric acid (or
other acid). The bugs you are trying to demonstrate with the Fite stain
are acid fast but acid-alcohol labile.

This won't solve the problem with you odd staining though


Tony Henwood JP, MSc, BAppSc, GradDipSysAnalys, CT(ASC)
Laboratory Manager & Senior Scientist
The Children's Hospital at Westmead,
Locked Bag 4001, Westmead, 2145, AUSTRALIA.
Tel: 612 9845 3306
Fax: 612 9845 3318

-----Original Message-----
From: histonet-bounces <@t> lists.utsouthwestern.edu
[mailto:histonet-bounces <@t> lists.utsouthwestern.edu] On Behalf Of Martin,
Sent: Wednesday, 11 June 2008 10:57 PM
To: histonet
Subject: [Histonet] Fite stain

Good morning everyone,  
I am having a problem with my Fite stains.  Most stain beautifully but I
have had trouble with a few cases.  Here are the doc's comments:
"case xxxx has some lipomembranous change- and this may not really be an
entirely false positive result. But there is clearly no explanation for
the stuff in xxxx that stains, including some fibrin. I've never seen
this before. It's not the usual round spots from inadequately rinsing
off the peanut oil...."
"A couple of days ago, I saw a granulomatous reaction that had tiny Fite
positive "blobbos" that looked like microbes in tiny cystic spaces
within the granulomas. I initially thought they might be real organisms
but then I did a TB stain and proved that they were nothing. Just
moments ago, XXXX had a case that was essentially identical. The Fite
stain is working perfectly for ID of microbes, but it seems to have a
false positive kind of reactivity that can be seen in small spaces
within a granulomatous infiltrate. On an occasional basis only."
Does anyone have any idea?  Our procedure is 2 changes of xylene/peanut
oil, air dry, rinse, carbol fuchsin for 15 min, rinse, differentiate in
1% acid alcohol, rinse, counterstain in methylene blue, air dry.
Thanks in advance,

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